SB2026102973 - Deadlock in Linux kernel scsi libsas driver

Description

This security bulletin contains information about 1 vulnerability.

1) Deadlock (CVE-ID: CVE-2026-99202)

CWE-ID: CWE-833 - Deadlock

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/08b95ef36a64c3ae4490794bed3c35d0c3354e85
• https://git.kernel.org/stable/c/81e097a064b28b4a1f6ca1a8b433e659c1bd64c0
• https://git.kernel.org/stable/c/c9fb89246d9922ac0a45d504adb03e0bb971310c