{"api_version":"1","generated_at":"2026-09-25T13:40:17+00:00","cve":"CVE-2026-98020","urls":{"html":"https://cve.report/CVE-2026-98020","api":"https://cve.report/api/cve/CVE-2026-98020.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98020","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98020"},"summary":{"title":"pds_core: fix cmd_regs access racing BAR unmap on reset","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_lock, and\npdsc_legacy_firmware_update()'s download loop derefs cmd_regs after\ndropping and retaking the lock without re-checking. An FLR concurrent\nwith a devlink flash can unmap cmd_regs under an in-flight devcmd,\ncausing a NULL deref or a write to unmapped MMIO.\n\nTake devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in\nthe download loop. Only the PF maps cmd_regs and runs devcmd, so skip\nthe unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do.\n\nA reset that completes entirely within the unlocked window is not a\ncorrectness problem for the image: the device clears its update session,\nso a resumed download is rejected, and it verifies the staged image\nbefore writing a flash slot, reporting PDS_RC_BAD_FW rather than\nactivating it.\n\npdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The\ninterrupt and start/stop readers of those are quiesced before the unmap\nby pdsc_fw_down(), which frees the interrupts and tears down the queues.\nThe debugfs readers are not, since those files outlive a reset; that is\npre-existing and out of scope here.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:30","updated_at":"2026-09-25 11:17:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6","name":"https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170","name":"https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4","name":"https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","name":"https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98020","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e96094c1d11cce4deb5da3c0500d49041ab845b8 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e96094c1d11cce4deb5da3c0500d49041ab845b8 fa31bd14c5042c6315bb2182c963f03ca6e79ca4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e96094c1d11cce4deb5da3c0500d49041ab845b8 09f831bfe39de5b8026fefb3d106b5cc93272170 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e96094c1d11cce4deb5da3c0500d49041ab845b8 7980325b2f71e3f65c1323c39792e2455da6fab6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6ec6ac9432941ec85a2221c91b1ecfc85680d89 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 692488941283d72362274620b9abd28109fc459f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.16 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7.4 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * 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/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","status":"affected","version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","versionType":"git"},{"lessThan":"fa31bd14c5042c6315bb2182c963f03ca6e79ca4","status":"affected","version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","versionType":"git"},{"lessThan":"09f831bfe39de5b8026fefb3d106b5cc93272170","status":"affected","version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","versionType":"git"},{"lessThan":"7980325b2f71e3f65c1323c39792e2455da6fab6","status":"affected","version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","versionType":"git"},{"status":"affected","version":"f6ec6ac9432941ec85a2221c91b1ecfc85680d89","versionType":"git"},{"status":"affected","version":"692488941283d72362274620b9abd28109fc459f","versionType":"git"},{"lessThan":"6.7","status":"affected","version":"6.6.16","versionType":"semver"},{"lessThan":"6.8","status":"affected","version":"6.7.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_lock, and\npdsc_legacy_firmware_update()'s download loop derefs cmd_regs after\ndropping and retaking the lock without re-checking. An FLR concurrent\nwith a devlink flash can unmap cmd_regs under an in-flight devcmd,\ncausing a NULL deref or a write to unmapped MMIO.\n\nTake devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in\nthe download loop. Only the PF maps cmd_regs and runs devcmd, so skip\nthe unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do.\n\nA reset that completes entirely within the unlocked window is not a\ncorrectness problem for the image: the device clears its update session,\nso a resumed download is rejected, and it verifies the staged image\nbefore writing a flash slot, reporting PDS_RC_BAD_FW rather than\nactivating it.\n\npdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The\ninterrupt and start/stop readers of those are quiesced before the unmap\nby pdsc_fw_down(), which frees the interrupts and tears down the queues.\nThe debugfs readers are not, since those files outlive a reset; that is\npre-existing and out of scope here."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:40.900Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2"},{"url":"https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4"},{"url":"https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170"},{"url":"https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6"}],"title":"pds_core: fix cmd_regs access racing BAR unmap on reset","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98020","datePublished":"2026-09-25T10:23:40.900Z","dateReserved":"2026-09-25T10:19:56.069Z","dateUpdated":"2026-09-25T10:23:40.900Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:30","lastModifiedDate":"2026-09-25 11:17:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98020","Ordinal":"1","Title":"pds_core: fix cmd_regs access racing BAR unmap on reset","CVE":"CVE-2026-98020","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98020","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_lock, and\npdsc_legacy_firmware_update()'s download loop derefs cmd_regs after\ndropping and retaking the lock without re-checking. An FLR concurrent\nwith a devlink flash can unmap cmd_regs under an in-flight devcmd,\ncausing a NULL deref or a write to unmapped MMIO.\n\nTake devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in\nthe download loop. Only the PF maps cmd_regs and runs devcmd, so skip\nthe unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do.\n\nA reset that completes entirely within the unlocked window is not a\ncorrectness problem for the image: the device clears its update session,\nso a resumed download is rejected, and it verifies the staged image\nbefore writing a flash slot, reporting PDS_RC_BAD_FW rather than\nactivating it.\n\npdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The\ninterrupt and start/stop readers of those are quiesced before the unmap\nby pdsc_fw_down(), which frees the interrupts and tears down the queues.\nThe debugfs readers are not, since those files outlive a reset; that is\npre-existing and out of scope here.","Type":"Description","Title":"pds_core: fix cmd_regs access racing BAR unmap on reset"}]}}}