wifi: mac80211: disconnect on CSA to channel 0

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Summary

CVECVE-2026-90344
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:33 UTC
Updated2026-09-17 17:17:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: disconnect on CSA to channel 0 The refactor for the CSA parsing erroneously equates channel zero and no information present, leading it to ignore a CSA on an AP that advertises a switch to that (invalid) channel. This leads to not disconnecting, which we should. For Intel devices, this can lead to a firmware crash. Fix this by using an int type for the channel number as well as the opclass, and using a (negative) value that cannot be encoded in the element to indicate it's not present.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 21c3f8f95554feff9bed15703e89adbe582e0383 099aadb2012d7490bc584cc5075ef11cbc33f2c3 git Not specified
CNA Linux Linux affected 21c3f8f95554feff9bed15703e89adbe582e0383 e7bc5ab93acd1c3f54feeb9fa19ead3530168090 git Not specified
CNA Linux Linux affected 21c3f8f95554feff9bed15703e89adbe582e0383 eef374088450bb91626e133c7172b8a0e969a522 git Not specified
CNA Linux Linux affected 21c3f8f95554feff9bed15703e89adbe582e0383 cf57f0a674cc3e3cda1a789359cc1238b61b9d7d git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 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/099aadb2012d7490bc584cc5075ef11cbc33f2c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf57f0a674cc3e3cda1a789359cc1238b61b9d7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7bc5ab93acd1c3f54feeb9fa19ead3530168090 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eef374088450bb91626e133c7172b8a0e969a522 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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