PT-2025-41065 · Linux+3 · Linux Kernel+3

Published 2025-10-07 · Updated 2025-11-28 · CVE-2023-53621

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contained a flaw in the memcontrol subsystem related to how memory cgroups (memcg) were handled. Specifically, the issue arose during the eviction recency check, where an attempt was made to retrieve a memcg by its ID. There was a possibility of retrieving a newly allocated memcg instead of the original one that had been killed. This could lead to a NULL pointer dereference during memcg hierarchy traversal in the mem cgroup get nr swap pages() function, potentially causing a system crash. The patch resolves this by adjusting the timing of memcg ID publication.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2023-53621

RHSA-2024:2394

RHSA-2024:8856

SUSE-SU-2025:21040-1

SUSE-SU-2025:21052-1

SUSE-SU-2025:21056-1

SUSE-SU-2025:21064-1

SUSE-SU-2025:4057-1

SUSE-SU-2025:4128-1

SUSE-SU-2025:4132-1

SUSE-SU-2025:4140-1

SUSE-SU-2025:4141-1

SUSE-SU-2025:4301-1

Affected Products

Centos

Linux Kernel

Red Hat

Suse

References · 1010

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53621.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2023-53621 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4057-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4128-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21056-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53621 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4132-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53621 · Vendor Advisory
• https://git.kernel.org/stable/c/6f0df8e16eb543167f2929cb756e695709a3551d · Patch
• https://osv.dev/vulnerability/SUSE-SU-2025:21064-1 · Vendor Advisory
• https://git.kernel.org/stable/c/b9d30c38ee859d833a51131b5b4b864c7a6219d0 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53621 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21040-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4301-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4140-1 · Vendor Advisory