Race condition in Linux kernel - CVE-2026-90248

Vulnerability identifier: #VU151242

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90248

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to silently unlink an active traffic classifier.

The vulnerability exists due to improper ownership tracking in tc_new_tfilter() when handling concurrent traffic-control filter insertions. A local user can race another request to insert a traffic-control filter at the same chain and priority to silently unlink an active traffic classifier.

Linux kernel
Debian Linux
Ubuntu
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1124.133
linux (Ubuntu package) - update to 7.0.0-42.42
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/219c87aeefdcc8c1caf28cc99e9b361ce7393d3a
• https://git.kernel.org/stable/c/a68e664ddf16ecae6d769d6a2eb356f8abab75c9
• https://git.kernel.org/stable/c/bbe2fd6d77df630356185406a97317f6aa6a92cf
• https://git.kernel.org/stable/c/bee2208276c8e0e40a249ffdcf6e5434a79a847c
• https://git.kernel.org/stable/c/d4e359b3608a0e184bbe8d61a5c3b50d0831c44a
• https://git.kernel.org/stable/c/dc8b33b819cb02a75936940c120aa669ad89942d
• https://git.kernel.org/stable/c/df02b6dc136af45e92ee4c86f4aa6c9a60790b1e

• Race condition in Linux kernel sched
• Debian update for linux
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more