mac802154: fix netdev use-after-free in beacon worker

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74661
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:39 UTC
Updated2026-08-22 16:16:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mac802154: fix netdev use-after-free in beacon worker mac802154_beacon_worker() reads local->beacon_req under RCU and derives the sub-interface from the request, but then drops the RCU read lock and continues to use both sdata and the embedded wpan_dev. mac802154_stop_beacons_locked() cancels only pending beacon work, clears local->beacon_req and frees the request. A beacon worker that is already running can therefore continue after interface teardown and dereference the freed netdev private area. The scan worker already pins the netdev before leaving RCU. Apply the same lifetime rule to the beacon worker: take a netdev reference while the request is still protected by RCU, and release it on all paths that continue after the reference is acquired.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3accf4762734a69ebd03cba989249c78ac7dfc7e fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517 git Not specified
CNA Linux Linux affected 3accf4762734a69ebd03cba989249c78ac7dfc7e e5fb0e03bc7f45508c182a427357bf6b389a9033 git Not specified
CNA Linux Linux affected 3accf4762734a69ebd03cba989249c78ac7dfc7e e6cd416a899edc912b428c4ba399bd73f516cb31 git Not specified
CNA Linux Linux affected 3accf4762734a69ebd03cba989249c78ac7dfc7e 9d067e581597c462c51fee8a30b51bc48a68c4e1 git Not specified
CNA Linux Linux affected 3accf4762734a69ebd03cba989249c78ac7dfc7e 5f26a690e8efa54315e4922368daf54e0b8f5515 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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