{"api_version":"1","generated_at":"2026-07-20T14:42:05+00:00","cve":"CVE-2026-64100","urls":{"html":"https://cve.report/CVE-2026-64100","api":"https://cve.report/api/cve/CVE-2026-64100.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64100","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64100"},"summary":{"title":"drm/msm: Fix shrinker deadlock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm: Fix shrinker deadlock\n\nWith PROVE_LOCKING on an Snapdragon X1 and VM reclaim pressure, we see:\n\n   ======================================================\n   WARNING: possible circular locking dependency detected\n   7.0.0-debug+ #43 Tainted: G        W\n   ------------------------------------------------------\n   kswapd0/82 is trying to acquire lock:\n   ffff800080ec3870 (reservation_ww_class_acquire){+.+.}-{0:0}, at: msm_gem_shrinker_scan+0x17c/0x400 [msm]\n\n   but task is already holding lock:\n   ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   which lock already depends on the new lock.\n\n   the existing dependency chain (in reverse order) is:\n\n   -> #2 (fs_reclaim){+.+.}-{0:0}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          fs_reclaim_acquire+0xd0/0xf0\n          dma_resv_lockdep+0x224/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #1 (reservation_ww_class_mutex){+.+.}-{4:4}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          dma_resv_lockdep+0x1a8/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #0 (reservation_ww_class_acquire){+.+.}-{0:0}:\n          check_prev_add+0x114/0x790\n          validate_chain+0x594/0x6f0\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          drm_gem_lru_scan+0x1ac/0x440\n          msm_gem_shrinker_scan+0x17c/0x400 [msm]\n          do_shrink_slab+0x150/0x4a0\n          shrink_slab+0x144/0x460\n          shrink_one+0x9c/0x1b0\n          shrink_many+0x27c/0x5c0\n          shrink_node+0x344/0x550\n          balance_pgdat+0x2c0/0x988\n          kswapd+0x11c/0x318\n          kthread+0x10c/0x128\n          ret_from_fork+0x10/0x20\n\n   other info that might help us debug this:\n   Chain exists of:\n     reservation_ww_class_acquire --> reservation_ww_class_mutex --> fs_reclaim\n    Possible unsafe locking scenario:\n          CPU0                    CPU1\n          ----                    ----\n     lock(fs_reclaim);\n                                  lock(reservation_ww_class_mutex);\n                                  lock(fs_reclaim);\n     lock(reservation_ww_class_acquire);\n\n    *** DEADLOCK ***\n   1 lock held by kswapd0/82:\n    #0: ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   stack backtrace:\n   CPU: 4 UID: 0 PID: 82 Comm: kswapd0 Tainted: G        W           7.0.0-debug+ #43 PREEMPT(full)\n   Tainted: [W]=WARN\n   Hardware name: LENOVO 21BX0016US/21BX0016US, BIOS N3HET94W (1.66 ) 09/15/2025\n   Call trace:\n    show_stack+0x20/0x40 (C)\n    dump_stack_lvl+0x9c/0xd0\n    dump_stack+0x18/0x30\n    print_circular_bug+0x114/0x120\n    check_noncircular+0x178/0x198\n    check_prev_add+0x114/0x790\n    validate_chain+0x594/0x6f0\n    __lock_acquire+0x4d0/0xad0\n    lock_acquire.part.0+0xc4/0x248\n    lock_acquire+0x8c/0x248\n    drm_gem_lru_scan+0x1ac/0x440\n    msm_gem_shrinker_scan+0x17c/0x400 [msm]\n    do_shrink_slab+0x150/0x4a0\n    shrink_slab+0x144/0x460\n    shrink_one+0x9c/0x1b0\n    shrink_many+0x27c/0x5c0\n    shrink_node+0x344/0x550\n    balance_pgdat+0x2c0/0x988\n    kswapd+0x11c/0x318\n    kthread+0x10c/0x128\n    ret_from_fork+0x10/0x20\n\nkswapd0 holding fs_reclaim calls the MSM shrinker, which calls\ndma_resv_lock. This in turn acquires fs_reclaim.\n\nFix this deadlock by using dma_resv_trylock() instead, dropping the\nsubsequently unused passed wait-wound lock 'ticket'.\n\nPatchwork: https://patchwork.freedesktop.org/patch/723564/\n[rob: fixup compile errors, replace lockdep splat with somethin\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:51","updated_at":"2026-07-19 16:17:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/928788566c79046f71a211fc32c115400be76402","name":"https://git.kernel.org/stable/c/928788566c79046f71a211fc32c115400be76402","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/942968260e61d4a5d7552b20814b6277f9c553df","name":"https://git.kernel.org/stable/c/942968260e61d4a5d7552b20814b6277f9c553df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3392291fc509d8ad6e4ad90f15b0a193f721cbc9","name":"https://git.kernel.org/stable/c/3392291fc509d8ad6e4ad90f15b0a193f721cbc9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64100","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64100","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe4952b5f27cca5d143d3de249562d4cc984c1d6 942968260e61d4a5d7552b20814b6277f9c553df git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe4952b5f27cca5d143d3de249562d4cc984c1d6 928788566c79046f71a211fc32c115400be76402 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fe4952b5f27cca5d143d3de249562d4cc984c1d6 3392291fc509d8ad6e4ad90f15b0a193f721cbc9 git","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 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/gpu/drm/msm/msm_gem_shrinker.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"942968260e61d4a5d7552b20814b6277f9c553df","status":"affected","version":"fe4952b5f27cca5d143d3de249562d4cc984c1d6","versionType":"git"},{"lessThan":"928788566c79046f71a211fc32c115400be76402","status":"affected","version":"fe4952b5f27cca5d143d3de249562d4cc984c1d6","versionType":"git"},{"lessThan":"3392291fc509d8ad6e4ad90f15b0a193f721cbc9","status":"affected","version":"fe4952b5f27cca5d143d3de249562d4cc984c1d6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/gpu/drm/msm/msm_gem_shrinker.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":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm: Fix shrinker deadlock\n\nWith PROVE_LOCKING on an Snapdragon X1 and VM reclaim pressure, we see:\n\n   ======================================================\n   WARNING: possible circular locking dependency detected\n   7.0.0-debug+ #43 Tainted: G        W\n   ------------------------------------------------------\n   kswapd0/82 is trying to acquire lock:\n   ffff800080ec3870 (reservation_ww_class_acquire){+.+.}-{0:0}, at: msm_gem_shrinker_scan+0x17c/0x400 [msm]\n\n   but task is already holding lock:\n   ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   which lock already depends on the new lock.\n\n   the existing dependency chain (in reverse order) is:\n\n   -> #2 (fs_reclaim){+.+.}-{0:0}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          fs_reclaim_acquire+0xd0/0xf0\n          dma_resv_lockdep+0x224/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #1 (reservation_ww_class_mutex){+.+.}-{4:4}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          dma_resv_lockdep+0x1a8/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #0 (reservation_ww_class_acquire){+.+.}-{0:0}:\n          check_prev_add+0x114/0x790\n          validate_chain+0x594/0x6f0\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          drm_gem_lru_scan+0x1ac/0x440\n          msm_gem_shrinker_scan+0x17c/0x400 [msm]\n          do_shrink_slab+0x150/0x4a0\n          shrink_slab+0x144/0x460\n          shrink_one+0x9c/0x1b0\n          shrink_many+0x27c/0x5c0\n          shrink_node+0x344/0x550\n          balance_pgdat+0x2c0/0x988\n          kswapd+0x11c/0x318\n          kthread+0x10c/0x128\n          ret_from_fork+0x10/0x20\n\n   other info that might help us debug this:\n   Chain exists of:\n     reservation_ww_class_acquire --> reservation_ww_class_mutex --> fs_reclaim\n    Possible unsafe locking scenario:\n          CPU0                    CPU1\n          ----                    ----\n     lock(fs_reclaim);\n                                  lock(reservation_ww_class_mutex);\n                                  lock(fs_reclaim);\n     lock(reservation_ww_class_acquire);\n\n    *** DEADLOCK ***\n   1 lock held by kswapd0/82:\n    #0: ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   stack backtrace:\n   CPU: 4 UID: 0 PID: 82 Comm: kswapd0 Tainted: G        W           7.0.0-debug+ #43 PREEMPT(full)\n   Tainted: [W]=WARN\n   Hardware name: LENOVO 21BX0016US/21BX0016US, BIOS N3HET94W (1.66 ) 09/15/2025\n   Call trace:\n    show_stack+0x20/0x40 (C)\n    dump_stack_lvl+0x9c/0xd0\n    dump_stack+0x18/0x30\n    print_circular_bug+0x114/0x120\n    check_noncircular+0x178/0x198\n    check_prev_add+0x114/0x790\n    validate_chain+0x594/0x6f0\n    __lock_acquire+0x4d0/0xad0\n    lock_acquire.part.0+0xc4/0x248\n    lock_acquire+0x8c/0x248\n    drm_gem_lru_scan+0x1ac/0x440\n    msm_gem_shrinker_scan+0x17c/0x400 [msm]\n    do_shrink_slab+0x150/0x4a0\n    shrink_slab+0x144/0x460\n    shrink_one+0x9c/0x1b0\n    shrink_many+0x27c/0x5c0\n    shrink_node+0x344/0x550\n    balance_pgdat+0x2c0/0x988\n    kswapd+0x11c/0x318\n    kthread+0x10c/0x128\n    ret_from_fork+0x10/0x20\n\nkswapd0 holding fs_reclaim calls the MSM shrinker, which calls\ndma_resv_lock. This in turn acquires fs_reclaim.\n\nFix this deadlock by using dma_resv_trylock() instead, dropping the\nsubsequently unused passed wait-wound lock 'ticket'.\n\nPatchwork: https://patchwork.freedesktop.org/patch/723564/\n[rob: fixup compile errors, replace lockdep splat with somethin\n---truncated---"}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:05.530Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/942968260e61d4a5d7552b20814b6277f9c553df"},{"url":"https://git.kernel.org/stable/c/928788566c79046f71a211fc32c115400be76402"},{"url":"https://git.kernel.org/stable/c/3392291fc509d8ad6e4ad90f15b0a193f721cbc9"}],"title":"drm/msm: Fix shrinker deadlock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64100","datePublished":"2026-07-19T15:40:05.530Z","dateReserved":"2026-07-19T07:54:57.033Z","dateUpdated":"2026-07-19T15:40:05.530Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:51","lastModifiedDate":"2026-07-19 16:17:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64100","Ordinal":"1","Title":"drm/msm: Fix shrinker deadlock","CVE":"CVE-2026-64100","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64100","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm: Fix shrinker deadlock\n\nWith PROVE_LOCKING on an Snapdragon X1 and VM reclaim pressure, we see:\n\n   ======================================================\n   WARNING: possible circular locking dependency detected\n   7.0.0-debug+ #43 Tainted: G        W\n   ------------------------------------------------------\n   kswapd0/82 is trying to acquire lock:\n   ffff800080ec3870 (reservation_ww_class_acquire){+.+.}-{0:0}, at: msm_gem_shrinker_scan+0x17c/0x400 [msm]\n\n   but task is already holding lock:\n   ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   which lock already depends on the new lock.\n\n   the existing dependency chain (in reverse order) is:\n\n   -> #2 (fs_reclaim){+.+.}-{0:0}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          fs_reclaim_acquire+0xd0/0xf0\n          dma_resv_lockdep+0x224/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #1 (reservation_ww_class_mutex){+.+.}-{4:4}:\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          dma_resv_lockdep+0x1a8/0x348\n          do_one_initcall+0x84/0x5d0\n          do_initcalls+0x194/0x1d8\n          kernel_init_freeable+0x128/0x180\n          kernel_init+0x2c/0x160\n          ret_from_fork+0x10/0x20\n\n   -> #0 (reservation_ww_class_acquire){+.+.}-{0:0}:\n          check_prev_add+0x114/0x790\n          validate_chain+0x594/0x6f0\n          __lock_acquire+0x4d0/0xad0\n          lock_acquire.part.0+0xc4/0x248\n          lock_acquire+0x8c/0x248\n          drm_gem_lru_scan+0x1ac/0x440\n          msm_gem_shrinker_scan+0x17c/0x400 [msm]\n          do_shrink_slab+0x150/0x4a0\n          shrink_slab+0x144/0x460\n          shrink_one+0x9c/0x1b0\n          shrink_many+0x27c/0x5c0\n          shrink_node+0x344/0x550\n          balance_pgdat+0x2c0/0x988\n          kswapd+0x11c/0x318\n          kthread+0x10c/0x128\n          ret_from_fork+0x10/0x20\n\n   other info that might help us debug this:\n   Chain exists of:\n     reservation_ww_class_acquire --> reservation_ww_class_mutex --> fs_reclaim\n    Possible unsafe locking scenario:\n          CPU0                    CPU1\n          ----                    ----\n     lock(fs_reclaim);\n                                  lock(reservation_ww_class_mutex);\n                                  lock(fs_reclaim);\n     lock(reservation_ww_class_acquire);\n\n    *** DEADLOCK ***\n   1 lock held by kswapd0/82:\n    #0: ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n   stack backtrace:\n   CPU: 4 UID: 0 PID: 82 Comm: kswapd0 Tainted: G        W           7.0.0-debug+ #43 PREEMPT(full)\n   Tainted: [W]=WARN\n   Hardware name: LENOVO 21BX0016US/21BX0016US, BIOS N3HET94W (1.66 ) 09/15/2025\n   Call trace:\n    show_stack+0x20/0x40 (C)\n    dump_stack_lvl+0x9c/0xd0\n    dump_stack+0x18/0x30\n    print_circular_bug+0x114/0x120\n    check_noncircular+0x178/0x198\n    check_prev_add+0x114/0x790\n    validate_chain+0x594/0x6f0\n    __lock_acquire+0x4d0/0xad0\n    lock_acquire.part.0+0xc4/0x248\n    lock_acquire+0x8c/0x248\n    drm_gem_lru_scan+0x1ac/0x440\n    msm_gem_shrinker_scan+0x17c/0x400 [msm]\n    do_shrink_slab+0x150/0x4a0\n    shrink_slab+0x144/0x460\n    shrink_one+0x9c/0x1b0\n    shrink_many+0x27c/0x5c0\n    shrink_node+0x344/0x550\n    balance_pgdat+0x2c0/0x988\n    kswapd+0x11c/0x318\n    kthread+0x10c/0x128\n    ret_from_fork+0x10/0x20\n\nkswapd0 holding fs_reclaim calls the MSM shrinker, which calls\ndma_resv_lock. This in turn acquires fs_reclaim.\n\nFix this deadlock by using dma_resv_trylock() instead, dropping the\nsubsequently unused passed wait-wound lock 'ticket'.\n\nPatchwork: https://patchwork.freedesktop.org/patch/723564/\n[rob: fixup compile errors, replace lockdep splat with somethin\n---truncated---","Type":"Description","Title":"drm/msm: Fix shrinker deadlock"}]}}}