Race condition in Linux kernel - CVE-2026-64065
Published: July 20, 2026
Vulnerability identifier: #VU138565
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64065
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state management in netfs_write_begin() when handling write operations through the netfs and ceph write path. A local user can trigger the kernel BUG with crafted write activity to cause a denial of service.
The issue manifests as a VM_BUG_ON_FOLIO condition that can lead to an invalid opcode exception and kernel crash.
How to mitigate CVE-2026-64065
Install security update from vendor's repository.