Integer overflow in Linux kernel - CVE-2026-43254
Published: May 7, 2026
Vulnerability identifier: #VU130452
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-43254
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an integer overflow in ovpn_tcp_recv when processing coalesced TCP stream data. A remote attacker can send specially crafted TCP stream packets to cause a denial of service.
The issue occurs when large cloned socket buffers contain multiple coalesced packets, which can trigger packet drops during inner packet decapsulation.
How to mitigate CVE-2026-43254
Install security update from vendor's repository.