CVE-2026-93784

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]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < 269498ce6c1e2132b072aa0c8660404926008f03affected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < 685082f4be77f4657b498ebbe9f942ef65c492cfaffected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61affected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < d01f1600e8b075aa17adb751ac9881bb6ee40dccaffected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < c970879e03b23a27df42caf7ba506485a165fb96affected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < 01cc395cecfaa73134d39fb9a401d9605d8bb2c5affected
LinuxLinuxf21293549f60f88c74fcb9944737f11048896dc4 < a2f5286ca4f304d3fd469f01b96b518608912a5caffected
LinuxLinux2.6.32affected
LinuxLinux0 < 2.6.32unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References