{"id":"CVE-2026-98020","state":"PUBLISHED","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.","publishedAt":"2026-09-25T10:23:40.900Z","updatedAt":"2026-10-19T09:12:25.476Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6ec6ac9432941ec85a2221c91b1ecfc85680d89","status":"affected","lessThan":"0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"fa31bd14c5042c6315bb2182c963f03ca6e79ca4","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"09f831bfe39de5b8026fefb3d106b5cc93272170","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"7980325b2f71e3f65c1323c39792e2455da6fab6","versionType":"git"},{"version":"692488941283d72362274620b9abd28109fc459f","status":"affected","versionType":"git"},{"version":"6.6.16","status":"affected","lessThan":"6.6.158","versionType":"semver"},{"version":"6.7.4","status":"affected","lessThan":"6.8","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"]}],"references":["https://git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9","https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4","https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170","https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98020.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98020","state":"PUBLISHED","datePublished":"2026-09-25T10:23:40.900Z","dateUpdated":"2026-10-19T09:12:25.476Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.069Z"},"containers":{"cna":{"title":"pds_core: fix cmd_regs access racing BAR unmap on reset","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6ec6ac9432941ec85a2221c91b1ecfc85680d89","status":"affected","lessThan":"0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"fa31bd14c5042c6315bb2182c963f03ca6e79ca4","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"09f831bfe39de5b8026fefb3d106b5cc93272170","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","status":"affected","lessThan":"7980325b2f71e3f65c1323c39792e2455da6fab6","versionType":"git"},{"version":"692488941283d72362274620b9abd28109fc459f","status":"affected","versionType":"git"},{"version":"6.6.16","status":"affected","lessThan":"6.6.158","versionType":"semver"},{"version":"6.7.4","status":"affected","lessThan":"6.8","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/amd/pds_core/fw.c","drivers/net/ethernet/amd/pds_core/main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:25.476Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.16","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}