PT-2026-8168 · Linux+2 · Linux Kernel+2

Published 2026-01-01 · Updated 2026-05-22 · CVE-2026-23173

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 6.18.0 #156

Description The Linux kernel contained a flaw in the net/mlx5e module related to Traffic Control (TC) steering flows. Specifically, the issue occurred during the deletion of TC steering flows, where the process did not restrict iteration to existing peers. This resulted in attempts to access non-existent peers, leading to a kernel NULL pointer dereference and a potential system crash. The issue was identified as a BUG: kernel NULL pointer dereference.

Recommendations Update to version 6.18.0 #156 or later to resolve this issue.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-23173

OESA-2026-1760

OPENSUSE-SU-2026:20416-1

SUSE-SU-2026:0962-1

SUSE-SU-2026:1081-1

SUSE-SU-2026:20667-1

SUSE-SU-2026:20720-1

SUSE-SU-2026:20838-1

SUSE-SU-2026:20845-1

SUSE-SU-2026:20876-1

SUSE-SU-2026:20931-1

SUSE-SU-2026:21284-1

USN-8278-1

USN-8289-1

USN-8296-1

Affected Products

Linux Kernel

Ubuntu

Mlx5E

References · 1897

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23173.json · Exploit
• https://ubuntu.com/security/CVE-2026-23083 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23148 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23123 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40149 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23032 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-68309 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23138 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:20667-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71184 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23038 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23101 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-40359 · Security Note
• https://ubuntu.com/security/CVE-2026-23136 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-40272 · Security Note