Use-after-free in Linux kernel - CVE-2026-90302

Vulnerability identifier: #VU151185

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90302

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in the OCFS2 o2net heartbeat callback handling when local-node teardown overlaps heartbeat node-down callback processing. A local user can initiate local-node teardown during heartbeat callback processing to cause a denial of service.

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/073f51e39bed354452a057d38a4cc3952727c304
• https://git.kernel.org/stable/c/3e326f3bf16506873777444608e8b715aab74a7a
• https://git.kernel.org/stable/c/7601db4c9d3bd9ab2482a863cb05204154d51ae8
• https://git.kernel.org/stable/c/8f96b78314cff0778a3466e49e5edbc1e459c95c
• https://git.kernel.org/stable/c/a03078a9a2a1c5e4a62f65d389c1f75f9898e21d
• https://git.kernel.org/stable/c/aee687a2fb36974dc37e4e0f5b03802067c6c4ec
• https://git.kernel.org/stable/c/cbb4efc2f99d6a8dba09c96b10acad82da982cf9
• https://git.kernel.org/stable/c/fb61882e184ee5ca745806bc5b2a8483fa129bca

• Use-after-free in Linux kernel ocfs2 cluster
• 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