SB20260928308 - Deadlock in Linux kernel io_uring

Description

This security bulletin contains information about 1 vulnerability.

1) Deadlock (CVE-ID: CVE-2026-97619)

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.

The vulnerability exists due to improper synchronization of write accounting in the io_uring read/write completion handling when asynchronous writes complete while filesystem shutdown is freezing the superblock. A local user can issue an asynchronous write and initiate filesystem shutdown to cause a denial of service.

The condition occurs when the ring owner blocks in freeze_super() before queued task work runs.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/055d43a1233edbd80e558889258105ce63051bcd
• https://git.kernel.org/stable/c/796aa0547557e63338657ed1c487906f9fac4c73
• https://git.kernel.org/stable/c/cc580cee4dfa2ec9099c30ecbd4d804cbb996432