SB2026091281 - Race condition in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB2026091281
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-89704)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause silent data loss.
The vulnerability exists due to a race condition in _nfsd_copy_file_range() when processing asynchronous NFS COPY operations. A remote user can issue concurrent COPY and COMMIT or stable WRITE operations to cause silent data loss.
Remediation
Install update from vendor's website.