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CVE-2026-93784

Linux: wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in269498ce6c1e2132b072aa0c8660404926008f03Also 685082f4be77f4657b498ebbe9f942ef65c492cf, 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61 and 1 moreCVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

  • 269498ce6c1e2132b072aa0c8660404926008f03LinuxCVE List
  • 685082f4be77f4657b498ebbe9f942ef65c492cfLinuxCVE List
  • 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61LinuxCVE List
  • 01cc395cecfaa73134d39fb9a401d9605d8bb2c5LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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]

Text from CVE List

Affected versions 16

  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before 269498ce6c1e2132b072aa0c8660404926008f03CVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before 685082f4be77f4657b498ebbe9f942ef65c492cfCVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61CVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before d01f1600e8b075aa17adb751ac9881bb6ee40dccCVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before c970879e03b23a27df42caf7ba506485a165fb96CVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before 01cc395cecfaa73134d39fb9a401d9605d8bb2c5CVE List
  • Linuxaffected: f21293549f60f88c74fcb9944737f11048896dc4 before a2f5286ca4f304d3fd469f01b96b518608912a5cCVE List
  • Linuxaffected: 2.6.32CVE List
  • Linuxunaffected: all versions before 2.6.32CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 7