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CVE-2026-63802

kernel: blk-cgroup: fix UAF in __blkcg_rstat_flush()

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 31, 2026

Description

A flaw was found in the Linux kernel's block input/output control group (blk-cgroup) component. This vulnerability, a Use-After-Free (UAF), occurs when multiple block control groups are released at the same time. A race condition allows one group to remove another's entries while it is still in use, leading to premature memory deallocation. This can result in system instability or a denial of service.

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 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-825 · Expired Pointer Dereference