wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211_sme_get_conn_ies() to process the stored IE buffer, causing: • An out-of-bounds read in skip_ie() which reads ies[pos+1] (the length byte) past the end of the 1-byte buffer. • An integer underflow in the memcpy size argument when offs returned by ieee80211_ie_split() exceeds ies_len, causing unsigned subtraction to wrap to SIZE_MAX and triggering a fortify panic. Fix this by validating the IE buffer in cfg80211_wext_siwgenie() before storing it. [drop unnecessary ie_len check, update commit message]

Timeline

1. Sep 24, 2026, 4:02 PM UTCCVE published
2. Oct 3, 2026, 10:57 AM UTCRecord last updated

Affected versions

• Linux Linux

  From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in 269498ce6c1e2132b072aa0c8660404926008f03; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in 685082f4be77f4657b498ebbe9f942ef65c492cf; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in d01f1600e8b075aa17adb751ac9881bb6ee40dcc; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in c970879e03b23a27df42caf7ba506485a165fb96; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in 01cc395cecfaa73134d39fb9a401d9605d8bb2c5; From f21293549f60f88c74fcb9944737f11048896dc4 · fixed in a2f5286ca4f304d3fd469f01b96b518608912a5c

• Linux Linux

  2.6.32

• KernelLinux

  From 2.6.32 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53

References 7