Out-of-bounds read in Linux kernel - CVE-2026-89537
Published: September 12, 2026
Vulnerability identifier: #VU149271
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-89537
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to read memory out of bounds.
The vulnerability exists due to improper length validation in gss_krb5_verify_mic_v2() when verifying a short RFC 4121 MIC token. A remote attacker can supply a short MIC token to read memory out of bounds.
Affected software
Linux kernel
How to mitigate CVE-2026-89537
Install security update from vendor's repository.