Out-of-bounds write in Linux kernel - CVE-2026-23246
Published: March 20, 2026
Vulnerability identifier: #VU124207
CSH Severity: High
CVSS v4.0: 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
CVE-ID: CVE-2026-23246
CWE-ID: CWE-787
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-23246
Install security update from vendor's repository.