SB20260918359 - Improper synchronization in Linux kernel arm mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper synchronization (CVE-ID: CVE-2026-90304)

CWE-ID: CWE-662 - Improper Synchronization

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8d7cbc6df9632d334b21c4be66ccdde76a08fb13
• https://git.kernel.org/stable/c/e79ca91165d4fd18549c536abdb86101e889052f