SB2026050859 - Improper locking in Linux kernel scsi driver
Published: May 8, 2026
Security Bulletin ID
SB2026050859
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-43475)
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 locking in storvsc_queuecommand in the hv_storvsc driver when processing SCSI I/O on systems with PREEMPT_RT enabled. A local user can trigger crafted I/O activity to cause a denial of service.
Exploitation requires a Linux guest running on Hyper-V with PREEMPT_RT enabled.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/57297736c08233987e5d29ce6584c6ca2a831b12
- https://git.kernel.org/stable/c/91ab59f76d0866079420ebff1c7959fcd87a242e
- https://git.kernel.org/stable/c/b82462af23e45e066dd56d2736ea70159a6ad647
- https://git.kernel.org/stable/c/c2e73d8acd056347a70047e6be7cd98e0e811dfa
- https://git.kernel.org/stable/c/c7984d196476adcbd51c0ce386d7e90277198d57
- https://git.kernel.org/stable/c/cf00cb15f2515e38d3b7571bf6800b7c6ce70a84
- https://git.kernel.org/stable/c/e7919a293f9b6101e38bde0d8613daea6c9955df
- https://git.kernel.org/stable/c/f8db760f4f52a73a022a3d6c84c488ead952a9b5