SB2026090595 - Improper locking in Linux kernel fuse
Published: September 5, 2026
Security Bulletin ID
SB2026090595
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-80856)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock release in fuse_do_setattr() when processing a DAX truncate operation that requires a writeback flush. A local user can initiate such a setattr operation when the writeback flush fails to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695
- https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed
- https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763
- https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2
- https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546
- https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5
- https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e
- https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787