Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-43244
Published: May 7, 2026
Vulnerability identifier: #VU130494
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43244
CWE-ID: CWE-703
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 cleanup of an empty skb in the kcm_sendmsg()/kcm_write_msgs() message handling path when processing a partial sendmsg error followed by message completion. A local user can trigger a copy failure after a new frag_list skb is linked and then complete the message with a zero-length write to cause a kernel warning.
The issue occurs for SOCK_SEQPACKET sockets when partial data has already been copied and the message is later completed.
How to mitigate CVE-2026-43244
Install security update from vendor's repository.