SB20260320113 - Out-of-bounds write in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-23246)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a boundary error in the wifi: mac80211 component when handling ML Reconfiguration elements. A remote attacker can send a specially crafted wireless packet to execute arbitrary code.

Exploitation involves sending a malicious ML Reconfiguration element with a link_id value of 15, which exceeds the valid index range of the link_removal_timeout array, resulting in a stack-based out-of-bounds write.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/162d331d833dc73a3e905a24c44dd33732af1fc5
• https://git.kernel.org/stable/c/bfde158d5d1322c0c2df398a8d1ccce04943be2e
• https://git.kernel.org/stable/c/d58d71c2167601762351962b9604808d3be94400
• https://git.kernel.org/stable/c/f35ceec54d48e227fa46f8f97fd100a77b8eab15