Out-of-bounds read in Linux kernel - CVE-2026-64223
Published: July 27, 2026
Vulnerability identifier: #VU139780
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-64223
CWE-ID: CWE-125
Exploitation vector: Remote access
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 disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in ieee80211_parse_neg_ttlm() when parsing negotiated TTLM elements with sparse link-map presence bits. A remote attacker can send a specially crafted negotiated TTLM element to disclose sensitive information.
The read data is written into negotiated link-map fields but is gated by valid_links before any driver state is affected.
How to mitigate CVE-2026-64223
Install security update from vendor's repository.