Improper synchronization in Linux kernel - CVE-2026-90304
Published: September 18, 2026
Vulnerability identifier: #VU151172
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90304
CWE-ID: CWE-662
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause force_sig_fault() to be called with interrupts disabled.
The vulnerability exists due to improper interrupt-state management in the ARM do_DataAbort() and do_PrefetchAbort() fault handlers when handling unhandled user faults. A local user can execute a bkpt instruction to trigger an unhandled user fault and cause force_sig_fault() to be called with interrupts disabled.
The issue requires a PREEMPT_RT kernel with CONFIG_PERF_EVENTS disabled.
Affected software
Linux kernel
How to mitigate CVE-2026-90304
Install security update from vendor's repository.