PT-2025-37550 · Linux+2 · Linux Kernel+2

Published 2023-04-13 · Updated 2026-04-14 · CVE-2023-53186

Positive Technologies (AI Summary)

CVSS v2.0

6.0

Medium

Base vector

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

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

Description A race condition exists between coalescing and releasing SKBs (Socket Buffer) in the Linux kernel. A commit intended to fix coalescing for page pool fragment recycling inadvertently introduced a scenario where an SKB could be released while coalescing was still in progress. This could lead to inconsistent reference counts, potentially resulting in use-after-free or double-free errors. The issue stems from the requirement that skb cloned(@from) must be true until coalescing completes, and a failure to uphold this condition when a cloned SKB is released prematurely. A double-free error, indicated by a bad page state, prompted investigation into this issue.

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

Exploit

Use After Free

Race Condition

Weakness Enumeration

CWE-416

CWE-362

Related Identifiers

BDU:2026-05994

CVE-2023-53186

RHSA-2025:17896

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53186.json · Exploit
• https://bdu.fstec.ru/vul/2026-05994 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53186 · Vendor Advisory
• https://git.kernel.org/stable/c/0646dc31ca886693274df5749cd0c8c1eaaeb5ca · Patch
• https://osv.dev/vulnerability/CVE-2023-53186 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53186 · Vendor Advisory
• https://git.kernel.org/stable/c/71850b5af92da21b4862a9bc55bda61091247d00 · Patch
• https://cve.org/CVERecord?id=CVE-2023-53186 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53186 · Vendor Advisory
• https://git.kernel.org/stable/c/5f692c992a3bb9a8018e3488098b401a4229e7ec · Patch
• https://security-tracker.debian.org/tracker/CVE-2023-53186 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53186 · Vendor Advisory
• https://git.kernel.org/stable/c/906a6689bb0191ad2a44131a3377006aa098af59 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-53186 · Security Note
• https://docs.bell-sw.com/security/cves/CVE-2023-53186 · Note