PT-2026-36459 · Linux · Linux Kernel

Published 2026-05-01 · Updated 2026-05-26 · CVE-2026-43042

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

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

Description RCU-protected codepaths, specifically mpls forward() and mpls dump routes(), can maintain an inconsistent view of platform labels versus platform label during a concurrent resize operation performed by resize platform label table() under platform mutex. This inconsistency can result in out-of-bounds (OOB) accesses. Additionally, the mpls label ok() function is susceptible to this issue, meaning the check against RTA DST in rtm to route config() is insufficient when performed outside platform mutex.

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

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-43042

Affected Products

Linux Kernel

References · 13

• https://osv.dev/vulnerability/BELL-CVE-2026-43042 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43042 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43042 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43042 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43042 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-43042 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-43042 · Vendor Advisory
• https://git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43042 · Vendor Advisory
• https://git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef · Patch
• https://docs.bell-sw.com/security/cves/CVE-2026-43042 · Note
• https://t.me/CVEtracker/52413 · Telegram Post
• https://git.kernel.org/linus/629ec78ef8608d955ce217880cdc3e1873af3a15 · Note