{"api_version":"1","generated_at":"2026-06-02T10:06:59+00:00","cve":"CVE-2026-45904","urls":{"html":"https://cve.report/CVE-2026-45904","api":"https://cve.report/api/cve/CVE-2026-45904.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45904","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45904"},"summary":{"title":"powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\n\nThe recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device\nhotplug safe\") restructured the EEH driver to improve synchronization\nwith the PCI hotplug layer.\n\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\nintended scope in eeh_handle_normal_event(), leading to broken PCI\nerror reporting and improper EEH event triggering. Specifically,\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\nacquire the same lock internally, causing nested locking and disrupting\nnormal EEH event handling paths.\n\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\nwith two public wrappers:\n    eeh_pe_bus_get() with locking enabled.\n    eeh_pe_bus_get_nolock() that skips locking.\n\nCallers that already hold pci_lock_rescan_remove() now use\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\n\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\nposition—after eeh_pe_bus_get() and immediately before iterating affected\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\nbus rescan locking without recursive lock contention.\n\nThe eeh_pe_loc_get() function has been split into two functions:\n    eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\n    eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\n    code for given bus.\n\nThis resolves lockdep warnings such as:\n<snip>\n[   84.964298] [    T928] ============================================\n[   84.964304] [    T928] WARNING: possible recursive locking detected\n[   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted\n[   84.964315] [    T928] --------------------------------------------\n[   84.964320] [    T928] eehd/928 is trying to acquire lock:\n[   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964342] [    T928]\n                       but task is already holding lock:\n[   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964357] [    T928]\n                       other info that might help us debug this:\n[   84.964363] [    T928]  Possible unsafe locking scenario:\n\n[   84.964367] [    T928]        CPU0\n[   84.964370] [    T928]        ----\n[   84.964373] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964378] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964383] [    T928]\n                       *** DEADLOCK ***\n\n[   84.964388] [    T928]  May be due to missing lock nesting notation\n\n[   84.964393] [    T928] 1 lock held by eehd/928:\n[   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964408] [    T928]\n                       stack backtrace:\n[   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\n[   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\n[   84.964419] [    T928] Call Trace:\n[   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\n[   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\n[   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\n[   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\n[   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\n[   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\n[   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\n[   84.964442] [    T928] [c0000011a7157e50] [c00000\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:04","updated_at":"2026-05-27 14:48:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c","name":"https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea","name":"https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323","name":"https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39","name":"https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c","name":"https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf","name":"https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc","name":"https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4","name":"https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45904","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45904","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 502f08831a9afb72dc98a56ae6504da43e93b250 89810e2d80281d42f855fac813786758ee16e323 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f56e004b781719d8fdf6c9619b15caf2579bc1f2 788dd28fd49610d6047cbb15dbf1186afffdfbaf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 59c6d3d81d42bf543c90597b4f38c53d6874c5a1 f49faa4a64f8ac0e38983e606075b25dfcfc9ad4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a426e8a6ae161f51888585b065db0f8f93ab2e16 87a1f93986aa1500b85aeff16b0b71c29ea116ea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c60a8a387e9fcc28447ef36c03f8e49fd052a6 f8b16d5764ee1e78c1ef333017ad383ffe76fcdc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 6e6561231c6cfc32c5631aeecc0928ff2b14265c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 b85ee287bfe52c6b2d9b41758b5e0d08679d5b39 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 815a8d2feb5615ae7f0b5befd206af0b0160614c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d42bbd8f30ac38b1ce54715bf08ec3dac18d6b25 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 19d5036e7ad766cf212aebec23b9f1d7924a62bc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.241 5.10.252 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.190 5.15.202 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.148 6.1.165 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.102 6.6.128 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.42 6.12.75 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15.10 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16.1 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.252 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.202 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.165 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.128 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.75 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.14 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.4 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45904","cve":"CVE-2026-45904","epss":"0.000240000","percentile":"0.073320000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:21"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/powerpc/include/asm/eeh.h","arch/powerpc/kernel/eeh_driver.c","arch/powerpc/kernel/eeh_pe.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"89810e2d80281d42f855fac813786758ee16e323","status":"affected","version":"502f08831a9afb72dc98a56ae6504da43e93b250","versionType":"git"},{"lessThan":"788dd28fd49610d6047cbb15dbf1186afffdfbaf","status":"affected","version":"f56e004b781719d8fdf6c9619b15caf2579bc1f2","versionType":"git"},{"lessThan":"f49faa4a64f8ac0e38983e606075b25dfcfc9ad4","status":"affected","version":"59c6d3d81d42bf543c90597b4f38c53d6874c5a1","versionType":"git"},{"lessThan":"87a1f93986aa1500b85aeff16b0b71c29ea116ea","status":"affected","version":"a426e8a6ae161f51888585b065db0f8f93ab2e16","versionType":"git"},{"lessThan":"f8b16d5764ee1e78c1ef333017ad383ffe76fcdc","status":"affected","version":"d2c60a8a387e9fcc28447ef36c03f8e49fd052a6","versionType":"git"},{"lessThan":"6e6561231c6cfc32c5631aeecc0928ff2b14265c","status":"affected","version":"1010b4c012b0d78dfb9d3132b49aa2ef024a07a7","versionType":"git"},{"lessThan":"b85ee287bfe52c6b2d9b41758b5e0d08679d5b39","status":"affected","version":"1010b4c012b0d78dfb9d3132b49aa2ef024a07a7","versionType":"git"},{"lessThan":"815a8d2feb5615ae7f0b5befd206af0b0160614c","status":"affected","version":"1010b4c012b0d78dfb9d3132b49aa2ef024a07a7","versionType":"git"},{"status":"affected","version":"d42bbd8f30ac38b1ce54715bf08ec3dac18d6b25","versionType":"git"},{"status":"affected","version":"19d5036e7ad766cf212aebec23b9f1d7924a62bc","versionType":"git"},{"lessThan":"5.10.252","status":"affected","version":"5.10.241","versionType":"semver"},{"lessThan":"5.15.202","status":"affected","version":"5.15.190","versionType":"semver"},{"lessThan":"6.1.165","status":"affected","version":"6.1.148","versionType":"semver"},{"lessThan":"6.6.128","status":"affected","version":"6.6.102","versionType":"semver"},{"lessThan":"6.12.75","status":"affected","version":"6.12.42","versionType":"semver"},{"lessThan":"6.16","status":"affected","version":"6.15.10","versionType":"semver"},{"lessThan":"6.17","status":"affected","version":"6.16.1","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/powerpc/include/asm/eeh.h","arch/powerpc/kernel/eeh_driver.c","arch/powerpc/kernel/eeh_pe.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.252","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.202","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.165","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.128","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.75","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.252","versionStartIncluding":"5.10.241","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.202","versionStartIncluding":"5.15.190","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.165","versionStartIncluding":"6.1.148","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.128","versionStartIncluding":"6.6.102","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.75","versionStartIncluding":"6.12.42","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.14","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.4","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\n\nThe recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device\nhotplug safe\") restructured the EEH driver to improve synchronization\nwith the PCI hotplug layer.\n\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\nintended scope in eeh_handle_normal_event(), leading to broken PCI\nerror reporting and improper EEH event triggering. Specifically,\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\nacquire the same lock internally, causing nested locking and disrupting\nnormal EEH event handling paths.\n\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\nwith two public wrappers:\n    eeh_pe_bus_get() with locking enabled.\n    eeh_pe_bus_get_nolock() that skips locking.\n\nCallers that already hold pci_lock_rescan_remove() now use\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\n\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\nposition—after eeh_pe_bus_get() and immediately before iterating affected\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\nbus rescan locking without recursive lock contention.\n\nThe eeh_pe_loc_get() function has been split into two functions:\n    eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\n    eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\n    code for given bus.\n\nThis resolves lockdep warnings such as:\n<snip>\n[   84.964298] [    T928] ============================================\n[   84.964304] [    T928] WARNING: possible recursive locking detected\n[   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted\n[   84.964315] [    T928] --------------------------------------------\n[   84.964320] [    T928] eehd/928 is trying to acquire lock:\n[   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964342] [    T928]\n                       but task is already holding lock:\n[   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964357] [    T928]\n                       other info that might help us debug this:\n[   84.964363] [    T928]  Possible unsafe locking scenario:\n\n[   84.964367] [    T928]        CPU0\n[   84.964370] [    T928]        ----\n[   84.964373] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964378] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964383] [    T928]\n                       *** DEADLOCK ***\n\n[   84.964388] [    T928]  May be due to missing lock nesting notation\n\n[   84.964393] [    T928] 1 lock held by eehd/928:\n[   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964408] [    T928]\n                       stack backtrace:\n[   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\n[   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\n[   84.964419] [    T928] Call Trace:\n[   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\n[   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\n[   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\n[   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\n[   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\n[   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\n[   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\n[   84.964442] [    T928] [c0000011a7157e50] [c00000\n---truncated---"}],"providerMetadata":{"dateUpdated":"2026-05-27T12:17:12.504Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323"},{"url":"https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf"},{"url":"https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4"},{"url":"https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea"},{"url":"https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc"},{"url":"https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c"},{"url":"https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39"},{"url":"https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c"}],"title":"powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45904","datePublished":"2026-05-27T12:17:12.504Z","dateReserved":"2026-05-13T15:03:33.084Z","dateUpdated":"2026-05-27T12:17:12.504Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:04","lastModifiedDate":"2026-05-27 14:48:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45904","Ordinal":"1","Title":"powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH","CVE":"CVE-2026-45904","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45904","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\n\nThe recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device\nhotplug safe\") restructured the EEH driver to improve synchronization\nwith the PCI hotplug layer.\n\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\nintended scope in eeh_handle_normal_event(), leading to broken PCI\nerror reporting and improper EEH event triggering. Specifically,\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\nacquire the same lock internally, causing nested locking and disrupting\nnormal EEH event handling paths.\n\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\nwith two public wrappers:\n    eeh_pe_bus_get() with locking enabled.\n    eeh_pe_bus_get_nolock() that skips locking.\n\nCallers that already hold pci_lock_rescan_remove() now use\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\n\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\nposition—after eeh_pe_bus_get() and immediately before iterating affected\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\nbus rescan locking without recursive lock contention.\n\nThe eeh_pe_loc_get() function has been split into two functions:\n    eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\n    eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\n    code for given bus.\n\nThis resolves lockdep warnings such as:\n<snip>\n[   84.964298] [    T928] ============================================\n[   84.964304] [    T928] WARNING: possible recursive locking detected\n[   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted\n[   84.964315] [    T928] --------------------------------------------\n[   84.964320] [    T928] eehd/928 is trying to acquire lock:\n[   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964342] [    T928]\n                       but task is already holding lock:\n[   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964357] [    T928]\n                       other info that might help us debug this:\n[   84.964363] [    T928]  Possible unsafe locking scenario:\n\n[   84.964367] [    T928]        CPU0\n[   84.964370] [    T928]        ----\n[   84.964373] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964378] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964383] [    T928]\n                       *** DEADLOCK ***\n\n[   84.964388] [    T928]  May be due to missing lock nesting notation\n\n[   84.964393] [    T928] 1 lock held by eehd/928:\n[   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964408] [    T928]\n                       stack backtrace:\n[   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\n[   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\n[   84.964419] [    T928] Call Trace:\n[   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\n[   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\n[   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\n[   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\n[   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\n[   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\n[   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\n[   84.964442] [    T928] [c0000011a7157e50] [c00000\n---truncated---","Type":"Description","Title":"powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH"}]}}}