CVE-2026-98821

kernel: block: reject polled dio with user integrity metadata

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · October 18, 2026

Updated · October 24, 2026

Description

A flaw was found in the Linux kernel's block layer. A local user could exploit this vulnerability to cause a denial of service (DoS) by initiating polled direct I/O operations combined with user integrity metadata. Because the kernel improperly attempts to poll integrity metadata as standard block I/O request structures, an invalid pointer dereference occurs, resulting in a system crash.

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 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')