PT-2026-8211 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-02-14 · CVE-2026-23203

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 6.19.0-rc6-next-20260122-yocto-standard+

Description The Linux kernel contains a flaw in the cpsw new network driver related to the handling of the ndo set rx mode callback. Specifically, the callback is executed in a work queue, which can lead to issues when the RTNL lock is not held as expected by vlan for each(). This can trigger assertions and potentially cause instability. The issue stems from a previous commit that removed the RTNL lock for certain IPv6 operations, exposing this race condition. The problem occurs when vlan for each() is called within cpsw ndo set rx mode(), expecting the RTNL lock to be held, but it is not always the case.

Recommendations Update to a version newer than 6.19.0-rc6-next-20260122-yocto-standard+ to address this issue.

Exploit

Fix

Related Identifiers

CVE-2026-23203

Affected Products

Linux Kernel

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23203.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-23203 · Security Note
• https://git.kernel.org/stable/c/c0b5dc73a38f954e780f93a549b8fe225235c07a · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23203 · Vendor Advisory
• https://git.kernel.org/stable/c/d5b3a669866977dc87fd56fcf00a70df1536d258 · Patch
• https://cve.org/CVERecord?id=CVE-2026-23203 · Security Note
• https://ubuntu.com/security/CVE-2026-23203 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23203 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23203 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23203 · Vendor Advisory
• https://twitter.com/VulmonFeeds/status/2022747771925594283 · Twitter Post
• https://t.me/CVEtracker/44739 · Telegram Post
• https://git.kernel.org/linus/c0b5dc73a38f954e780f93a549b8fe225235c07a · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/2022716606250443024 · Twitter Post