wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

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Summary

CVECVE-2026-23444
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 16:16:28 UTC
Updated2026-04-07 13:21:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure ieee80211_tx_prepare_skb() has three error paths, but only two of them free the skb. The first error path (ieee80211_tx_prepare() returning TX_DROP) does not free it, while invoke_tx_handlers() failure and the fragmentation check both do. Add kfree_skb() to the first error path so all three are consistent, and remove the now-redundant frees in callers (ath9k, mt76, mac80211_hwsim) to avoid double-free. Document the skb ownership guarantee in the function's kdoc.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.039750000 (date 2026-04-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 06be6b149f7e406bcf16098567f5a6c9f042bced 06e769dddcbeb3baf2ce346273b53dd61fdbecf4 git Not specified
CNA Linux Linux affected 06be6b149f7e406bcf16098567f5a6c9f042bced 50f1b690b4868923fbd242298def2fb88662f108 git Not specified
CNA Linux Linux affected 06be6b149f7e406bcf16098567f5a6c9f042bced d5ad6ab61cbd89afdb60881f6274f74328af3ee9 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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