PT-2025-49752 · Ext4+3 · Ext4+3

CVE-2023-53861 · Published 2023-08-01 · Updated 2026-07-01

Positive Technologies (AI Summary)

CVSS v2.0

3.8

Low

Base vector

AV:L/AC:H/Au:S/C:N/I:N/A:C

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

Description A flaw exists in the Linux kernel related to group validation within the ext4 filesystem. Specifically, the ext4 mb good group function lacks a NULL check before performing a group corruption check, potentially leading to a kernel crash if the group (grp) is NULL. This issue involves accessing memory of a NULL group, triggering the crash.

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

BDU:2026-10218

CVE-2023-53861

OESA-2026-1075

RHSA-2024:10771

RHSA-2024:9315

SUSE-SU-2026:0278-1

SUSE-SU-2026:0281-1

SUSE-SU-2026:0293-1

SUSE-SU-2026:0315-1

SUSE-SU-2026:20477-1

SUSE-SU-2026:20498-1

SUSE-SU-2026:20845-1

SUSE-SU-2026:20876-1

Affected Products

Linux Kernel

Red Hat

Red Os

Ext4

References · 1484

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53861.json · Exploit
• https://osv.dev/vulnerability/BELL-CVE-2023-53861 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-50635 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-53861 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53861 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39970 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-40200 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2023-53861 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-10218 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:20477-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0293-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53861 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53861 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53861 · Security Note
• https://osv.dev/vulnerability/CVE-2023-53861 · Vendor Advisory