Deadlock in Linux kernel - CVE-2026-90193
Published: September 19, 2026
Vulnerability identifier: #VU151283
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-2026-90193
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in qcom_cpucp_mbox_irq_fn() when handling mailbox interrupts. A local user can trigger mailbox interrupt handling to cause a denial of service.
The issue occurs on systems using PREEMPT_RT, where the channel lock is converted to an rtmutex-based lock.
Affected software
Linux kernel
How to mitigate CVE-2026-90193
Install security update from vendor's repository.