CVE-2025-68195

kernel: Linux kernel: Denial of service via out-of-bounds memory access in AMD Zen5 microcode handling

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Severity

Moderate

Red Hat Product Security

6.3

CVSS 3.1

Review impact separately from score.

Published · December 16, 2025

Updated · August 14, 2026

Description

A flaw was found in the Linux kernel's handling of AMD Zen5 microcode. A local attacker could trigger an out-of-bounds memory access by running the x86_match_min_microcode_rev() function on a Zen5 CPU, due to a missing terminator in the zen5_rdseed_microcode. This vulnerability could lead to system instability or a denial of service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.3
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

CWE-125 · Out-of-bounds Read