PT-2026-39035 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43374

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 (affected versions not specified)

Description A use-after-free issue exists in the Linux kernel within the remove nh grp entry() function. When a nexthop is removed from a group, the system publishes the new group and immediately frees the removed entry's percpu stats using free percpu(). Because the synchronize net() grace period occurs after this action, RCU readers that entered before the update may still access the old group and dereference the freed stats via nh grp entry stats inc() and get cpu ptr(nhge->stats), leading to a use-after-free on percpu memory.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-43374

Affected Products

Linux Kernel

References · 15

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43374 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43374 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43374 · Security Note
• https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7 · Patch
• https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231 · Patch
• https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43374 · Vendor Advisory
• https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2 · Patch
• https://ubuntu.com/security/CVE-2026-43374 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43374 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43374 · Vendor Advisory
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-43374 · Note
• https://git.kernel.org/linus/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2 · Note
• https://twitter.com/CVEnew/status/2052810996398326262 · Twitter Post