CVE-2026-93784

Published: September 26, 2026Last modified: September 26, 2026

Description

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]

Status

References

• https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5
• https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c
• https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96