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CVE-2026-64477

kernel: x86,fs/resctrl: Prevent out-of-bounds access while offlining CPU when SNC enabled

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Severity

Moderate

Red Hat Product Security

6

CVSS 3.1

Review impact separately from score.

Published · July 25, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel. When a CPU is taken offline on systems with Sub-NUMA Clustering (SNC) enabled, a programming error in the resource control (resctrl) file system can lead to an out-of-bounds memory access. This issue may cause system instability or crashes. The vulnerability arises from an incorrect attempt to query a non-existent CPU during the offlining process.

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

CWE-125 · Out-of-bounds Read