PT-2025-18852 · Linux+4 · Linux Kernel+4

Published 2023-03-10 · Updated 2026-01-28 · CVE-2023-53088

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 versions prior to the fixed version

Description A use-after-free issue was found in the mptcp listener shutdown path in the Linux kernel. This issue can occur when the msk grace period expires between the last reference count drop in mptcp subflow queue clean() and the later access in inet csk listen stop(). The problem was reported by Christoph after refactoring the passive socket initialization.

Recommendations For Linux kernel versions prior to the fixed version, consider applying the patch that fixes the use-after-free issue in the mptcp listener shutdown path. This patch removes the unnecessary code for msk listener socket cleanup, as the mptcp worker will process each of the unaccepted msk sockets. Ensure that the patch depends on the two parent patches: 'mptcp: refactor passive socket initialization' and 'mptcp: use the workqueue to destroy unaccepted sockets'.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-664

CWE-911

CWE-416

Related Identifiers

ALSA-2025_16880

BDU:2026-03973

CESA-2024_3138

CVE-2023-53088

RHSA-2023:6583

RHSA-2023_6583

RHSA-2024:3138

RHSA-2024_3138

Affected Products

Astra Linux

Centos

Linux Kernel

Red Hat

Red Os

References · 22

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53088.json · Exploit
• https://osv.dev/vulnerability/CVE-2023-53088 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53088 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2023-53088 · Vendor Advisory
• https://git.kernel.org/stable/c/0f4f4cf5d32f10543deb946a37111e714579511e · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53088 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53088 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-03973 · Security Note
• https://git.kernel.org/stable/c/5564be74a22a61855f8b8c100d8c4abb003bb792 · Patch
• https://ubuntu.com/security/CVE-2023-53088 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53088 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53088 · Vendor Advisory
• https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518 · Patch
• https://lore.kernel.org/linux-cve-announce/2025050219-CVE-2023-53088-501c@gregkh/T · Note
• https://docs.bell-sw.com/security/cves/CVE-2023-53088 · Note