CVE-2023-52934

kernel: mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · March 27, 2025

Updated · November 1, 2026

Description

A flaw was found in the Linux kernel MADV_COLLAPSE path. A race with khugepaged can clear a PMD after the collapse code has decided it is a page-table pointer. A local user can trigger a bad PMD lookup and crash the kernel.

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-362 · Concurrent Execution using Shared Resource with Improper Synchronization