Double free in Linux kernel - CVE-2026-43249
Published: May 7, 2026
Vulnerability identifier: #VU130467
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-2026-43249
CWE-ID: CWE-415
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 double free in xen_9pfs_front_free when handling concurrent back-end change notifications. A local user can trigger concurrent back-end change notifications to cause a denial of service.
The issue can be triggered by a race involving the xenwatch thread and other back-end change notifications.
How to mitigate CVE-2026-43249
Install security update from vendor's repository.