Double free in Linux kernel - CVE-2026-31429
Published: April 24, 2026
Vulnerability identifier: #VU127717
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-2026-31429
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 a cross-cache free in skb_kfree_head() when freeing KFENCE-allocated skb head data. A local user can trigger allocation and freeing of a specially sized skb head object to cause a denial of service.
Exploitation requires KFENCE to be enabled.
How to mitigate CVE-2026-31429
Install security update from vendor's repository.