PT-2026-30131 · Linux · Linux Kernel

Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-23436

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 (affected versions not specified)

Description The Linux kernel contained a flaw where a network device could be unregistered between the time a reference was taken and the time it was locked, potentially leading to a memory leak during Netlink operation preparation. This occurred due to the potential for hierarchy allocation after a flush operation had already run. The issue was addressed by taking the instance lock during the pre-callback phase, eliminating the race condition and the need for dedicated lock/unlock callbacks.

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

Related Identifiers

CVE-2026-23436

Affected Products

Linux Kernel

References · 11

• https://git.kernel.org/stable/c/719f6784f918f9e32f3ff3b197f900e852223f9d · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-23436 · Vendor Advisory
• https://git.kernel.org/stable/c/d22921727023e7852704965e935f4d1fc83a5ec9 · Patch
• https://cve.org/CVERecord?id=CVE-2026-23436 · Security Note
• https://ubuntu.com/security/CVE-2026-23436 · Vendor Advisory
• https://git.kernel.org/stable/c/d75ec7e8ba1979a1eb0b9211d94d749cdce849c8 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-23436 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23436 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23436 · Vendor Advisory
• https://twitter.com/CVEnew/status/2040111896628736300 · Twitter Post
• https://git.kernel.org/linus/d75ec7e8ba1979a1eb0b9211d94d749cdce849c8 · Note