SB2026032586 - Improper Locking in Linux kernel ata driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Locking (CVE-ID: CVE-2026-23355)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper synchronization in the ATA subsystem when handling deferred SCSI commands. A local user can trigger command processing that leads to a system warning and potential disruption in storage operations.

The issue arises when pending work is not canceled after clearing deferred_qc, allowing stale work to execute in an invalid context, which results in a WARN_ON() and possible denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0d12453818c35e1ded84633152c6b05002ae48b9
• https://git.kernel.org/stable/c/58e658763ba2aa9168d8516b98a6314d7461a53e
• https://git.kernel.org/stable/c/6c5e8f16b5e8e614e829aaf38619bdd79107bb0a
• https://git.kernel.org/stable/c/aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9