SB2026102250 - Deadlock in Linux kernel ufs core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Deadlock (CVE-ID: CVE-2026-98478)

CWE-ID: CWE-833 - Deadlock

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 UFS error recovery.

The vulnerability exists due to an unrecoverable circular wait in the Linux kernel UFS core when handling error recovery. The ufshcd_err_handling_prepare() function quiesces the shared host tagset, including the pseudo SCSI device request queue, preventing internal commands subsequently issued by ufshcd_verify_dev_init() from being dispatched. A local user can trigger this deadlock, if able to induce the relevant error-recovery conditions, to prevent recovery and cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/9f6f4840def931814c106fc800f57a2d26befee6
• https://git.kernel.org/stable/c/b52d695d062095327b944acf7daabbc816ab319b