Race condition in Linux kernel - CVE-2026-89704
Published: September 12, 2026
Vulnerability identifier: #VU149104
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-89704
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89704
Install security update from vendor's repository.