Description
In 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.
Affected products
linux: linux kernel
References9
- git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4 Patch
- git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108 Patch
- git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9 Patch
- git.kernel.org/stable/c/3b4d27acafaeab478fd24f79ad6e593a892828b9
- git.kernel.org/stable/c/5ef8ca1c164786da24169af155c1ca1ff1353cf8
- git.kernel.org/stable/c/905ef207d5ed99ca64adfe39fba9ac46e434327a
- git.kernel.org/stable/c/9a779d1f480e83720b5384adf165604e7ee226bd
- git.kernel.org/stable/c/f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 12 November 2026
- CWE
- CWE-401
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