Improper input validation in Linux kernel - CVE-2026-43107
Published: May 7, 2026
Vulnerability identifier: #VU130650
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-2026-43107
CWE-ID: CWE-20
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 input validation in xfrm_get_ae() and xfrm_aevent_msgsize() when handling malformed netlink interactions for xfrm aevent messages. A local user can send a malformed netlink interaction to cause a denial of service.
The issue is triggered for states with if_id set, where the reply skb size calculation does not account for the XFRMA_IF_ID attribute.
How to mitigate CVE-2026-43107
Install security update from vendor's repository.