Deadlock in Linux kernel - CVE-2026-99202
Published: October 29, 2026
Vulnerability identifier: #VU158377
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-2026-99202
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 by deadlocking host adapter resume and associated storage operations.
The vulnerability exists due to a circular wait in the Linux kernel libsas function smp_execute_task_sg() when issuing an SMP command during host adapter resume. A local user can trigger an affected resume sequence to cause a denial of service: pm_runtime_get_sync() waits for the ongoing resume to finish, while the resume waits in sas_drain_work() for the same SMP operation to complete.
The deadlock requires an expander-attached SATA disk.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99202
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2