Use-after-free in Linux kernel - CVE-2026-68273

Vulnerability identifier: #VU142034

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68273

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 use-after-free and NULL pointer dereference in the amdgpu context pstate handling code when initializing or finalizing GPU contexts while stable pstate state changes are processed. A local user can create and tear down crafted contexts to cause a denial of service.

The issue arises because context pstate ownership transitions were not consistently protected by the stable_pstate_ctx_lock, and sysfs-triggered state changes can race with context handling.

Linux kernel
Debian Linux
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 4.18.0-553.169.1.el8_10, 5.14.0-687.52.1.el9_8
kernel-rt (Red Hat package) - update to 4.18.0-553.169.1.rt7.510.el8_10
linux (Debian package) - update to 6.12.105-1

• https://git.kernel.org/stable/c/23a8726e1d7597fe7c9a59d5dc42ba8b7d345b8a
• https://git.kernel.org/stable/c/9f9c88eb298c54348be3ca4087f4f4c615065b87
• https://git.kernel.org/stable/c/c1dc4ccb82c9e56325d8e7514ca4c90bd1efb351
• https://git.kernel.org/stable/c/e06c39cc1c48dca68a5ffd971c23025a52d46634

• Use-after-free in Linux kernel amd amdgpu driver
• Debian update for linux
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel