pds_core: fix cmd_regs access racing BAR unmap on reset

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98020
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:30 UTC
Updated2026-10-19 10:17:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: pds_core: fix cmd_regs access racing BAR unmap on reset pdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path clear/iounmap cmd_regs without devcmd_lock, and pdsc_legacy_firmware_update()'s download loop derefs cmd_regs after dropping and retaking the lock without re-checking. An FLR concurrent with a devlink flash can unmap cmd_regs under an in-flight devcmd, causing a NULL deref or a write to unmapped MMIO. Take devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in the download loop. Only the PF maps cmd_regs and runs devcmd, so skip the unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do. A reset that completes entirely within the unlocked window is not a correctness problem for the image: the device clears its update session, so a resumed download is rejected, and it verifies the staged image before writing a flash slot, reporting PDS_RC_BAD_FW rather than activating it. pdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The interrupt and start/stop readers of those are quiesced before the unmap by pdsc_fw_down(), which frees the interrupts and tears down the queues. The debugfs readers are not, since those files outlive a reset; that is pre-existing and out of scope here.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.054570000 (date 2026-10-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f6ec6ac9432941ec85a2221c91b1ecfc85680d89 0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9 git Not specified
CNA Linux Linux affected e96094c1d11cce4deb5da3c0500d49041ab845b8 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2 git Not specified
CNA Linux Linux affected e96094c1d11cce4deb5da3c0500d49041ab845b8 fa31bd14c5042c6315bb2182c963f03ca6e79ca4 git Not specified
CNA Linux Linux affected e96094c1d11cce4deb5da3c0500d49041ab845b8 09f831bfe39de5b8026fefb3d106b5cc93272170 git Not specified
CNA Linux Linux affected e96094c1d11cce4deb5da3c0500d49041ab845b8 7980325b2f71e3f65c1323c39792e2455da6fab6 git Not specified
CNA Linux Linux affected 692488941283d72362274620b9abd28109fc459f git Not specified
CNA Linux Linux affected 6.6.16 6.6.158 semver Not specified
CNA Linux Linux affected 6.7.4 6.8 semver Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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