PT-2025-40218 · Linux+2 · Linux Kernel+2

Published 2023-02-28 · Updated 2026-01-26 · CVE-2023-53511

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.18

Description The Linux kernel contains an issue where a file descriptor leak occurs when using io uring with filesystems that do not support non-waiting buffered reads, such as ocfs2. This can happen during operations like copying files using link-cp, leading to umount failures and potential system instability. The issue stems from a flaw in how file descriptors are handled during asynchronous read operations within the io uring framework. Specifically, the fget() function leaks a file descriptor when the filesystem returns -EOPNOTSUPP. The problem was introduced by commit a196c78b5443 in version 5.18. The issue can be reproduced by mounting an ocfs2 filesystem, copying a file to it, and then attempting to unmount the filesystem.

Recommendations Update to a version of the Linux kernel that includes the fix for this issue.

Exploit

Fix

Memory Leak

Buffer Overflow

Weakness Enumeration

CWE-401

CWE-120

Related Identifiers

BDU:2025-12900

CVE-2023-53511

RHSA-2023:6583

SUSE-SU-2025:03615-1

SUSE-SU-2025:3761-1

Affected Products

Linux Kernel

Suse

Ocfs2

References · 838

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53511.json · Exploit
• https://osv.dev/vulnerability/CVE-2023-53511 · Vendor Advisory
• https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b · Patch
• https://bdu.fstec.ru/vul/2025-12900 · Security Note
• https://ubuntu.com/security/CVE-2023-53511 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:3761-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53511 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53511 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:03615-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53511 · Vendor Advisory
• https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484 · Patch
• https://cve.org/CVERecord?id=CVE-2023-53511 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-53511 · Security Note
• https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53511 · Vendor Advisory