UBUNTU-CVE-2026-93784: Medium severity ubuntu/linux vulnerability
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate IEs in cfg80211wextsiwgenie() The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211wextsiwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211smegetconnies() to process the stored IE buffer, causing: - An out-of-bounds read in skipie() 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 ieee80211iesplit() exceeds ieslen, causing unsigned subtraction to wrap to SIZEMAX and triggering a fortify panic. Fix this by validating the IE buffer in cfg80211wextsiwgenie() before storing it. [drop unnecessary ielen check, update commit message]
Affected Software
Remediation
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Validate the information-element (IE) buffer in the Linux kernel function cfg80211_wext_siwgenie() before storing it, including validating the buffer length before memcpy processing.