wifi: mac80211: keep paired old chanctx alive

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98708
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:24 UTC
Updated2026-10-19 10:19:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: keep paired old chanctx alive An in-place replacement keeps reciprocal replace_ctx pointers between the old WILL_BE_REPLACED chanctx and the new REPLACES_OTHER chanctx. However, the early free paths only consider assigned and reserved link users when deciding whether to free the old chanctx. That lets the old chanctx be freed too early while the replacement partner still points back to it, either when the last assigned link is released or when that link successfully reassigns to another existing context. Later unreserve and switch-finalization paths can then follow a stale replace_ctx pointer. Keep a paired old chanctx alive until the replacement pair has been torn down. Apply the same check to both __ieee80211_link_release_channel() and ieee80211_link_use_reserved_reassign(). If the replacement is later abandoned, ieee80211_link_unreserve_chanctx() already tears down the pairing before freeing the old chanctx once no users remain.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f 21a688cbeae0e682f03e91f1e7a7eedd60d9d4f2 git Not specified
CNA Linux Linux affected 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f 1c82d0c5d509179ba2a4edfa096f516aebf960b0 git Not specified
CNA Linux Linux affected 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f afd1cdd16a25c7185b812a612ab7d5f2cbd1e086 git Not specified
CNA Linux Linux affected 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f 3412e9a800786d1dec4a58367db1cba275e7ef11 git Not specified
CNA Linux Linux affected 3.17 Not specified
CNA Linux Linux unaffected 3.17 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c82d0c5d509179ba2a4edfa096f516aebf960b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3412e9a800786d1dec4a58367db1cba275e7ef11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21a688cbeae0e682f03e91f1e7a7eedd60d9d4f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/afd1cdd16a25c7185b812a612ab7d5f2cbd1e086 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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