Improper handling of exceptional conditions in Linux kernel - CVE-2026-89706
Published: September 12, 2026
Vulnerability identifier: #VU149106
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89706
CWE-ID: CWE-755
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause copied data to be silently lost.
The vulnerability exists due to improper handling of writeback errors in the NFS server async COPY operation in _nfsd_copy_file_range() when processing an asynchronous COPY request whose writeback fails. A remote attacker can issue an asynchronous COPY request that encounters a writeback failure to cause copied data to be silently lost.
Affected software
Linux kernel
How to mitigate CVE-2026-89706
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3