wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90373
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:36 UTC
Updated2026-09-17 17:17:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear mt7915_remove_interface() cleared the wcid mask bit with no lock held and before clearing the RCU wcid pointer. The mask is a non-atomic RMW shared with the allocators, which all run under dev->mt76.mutex; on DBDC the two wiphys share one mt76_dev, so this raced add_interface/sta_add on the other band and could leak or double-hand-out a wcid. Clearing the bit before the RCU pointer also let a concurrent allocation reuse the index and publish its wcid, which the subsequent NULL assignment then wiped. Move the clear into the existing mutex section, after the RCU pointer is cleared.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f3049b88b2b32326df97461813ae73e8bbc296fc 5dce25f1d609ba991a9c22c27be586c92f03ed77 git Not specified
CNA Linux Linux affected f3049b88b2b32326df97461813ae73e8bbc296fc b4a41a47a67c788e6b0625fa517ec8872e99bb6c git Not specified
CNA Linux Linux affected f3049b88b2b32326df97461813ae73e8bbc296fc a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b git Not specified
CNA Linux Linux affected f3049b88b2b32326df97461813ae73e8bbc296fc 6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5dce25f1d609ba991a9c22c27be586c92f03ed77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b4a41a47a67c788e6b0625fa517ec8872e99bb6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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