CVE-2026-64156: netfs, afs: Fix write skipping in dir/link writepages
In the Linux kernel, the following vulnerability has been resolved:
netfs, afs: Fix write skipping in dir/link writepages
Fix netfswritesingle() and afssinglewritepages() to better handle a write that would be skipped due to lock contention and WBSYNCNONE by returning 1 from netfswritesingle() if it skipped and making afssinglewritepages() skip also. If a skip occurs, the inode must be re-marked as the VFS may have cleared the mark.
This is really only theoretical for directories in netfswritesingle() as the only path to that is through afssinglewritepages() that takes the ->validatelock around it, thereby serialising it.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64156?
CVE-2026-64156 has a risk rating of 17.
How do I fix CVE-2026-64156?
Updating to the latest version of the Linux kernel that includes the fix for CVE-2026-64156 will resolve the vulnerability.
What components are affected by CVE-2026-64156?
CVE-2026-64156 affects the netfs and AFS subsystems in the Linux kernel.
What type of vulnerability is CVE-2026-64156?
CVE-2026-64156 is a kernel-level vulnerability related to handling asynchronous write operations.
When was CVE-2026-64156 published?
CVE-2026-64156 was published on July 19, 2026.