Use-after-free in Linux kernel - CVE-2026-90003
Published: September 16, 2026
Vulnerability identifier: #VU150284
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90003
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code, disclose sensitive information, or cause a denial of service.
The vulnerability exists due to a use-after-free in the futex requeue priority-inheritance handling when racing an early waiter wakeup with a priority-inheritance futex requeue. A local user can trigger FUTEX_CMP_REQUEUE_PI operations to access a waiter's stack-allocated futex queue after the waiter returns from the system call.
Exploitation is limited to systems using PREEMPT_RT.
Affected software
Linux kernel
How to mitigate CVE-2026-90003
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/220ee9e04ca3b7f014c000264aa6c884f036c86e
- https://git.kernel.org/stable/c/244f301759fd34b1dd0b4192ce44f8ef224e027d
- https://git.kernel.org/stable/c/7d1559126d86be6e4f6a85663dfbfe85caa47e37
- https://git.kernel.org/stable/c/81aadbd09bf1dcd3238212f336ba699503557ae8
- https://git.kernel.org/stable/c/a3b8d46fe401cba3a5c46dea610e6eb3dc15370e
- https://git.kernel.org/stable/c/e4a4ccfa470f910b747b3ee8d18670ed8ac8a236