Memory leak in Linux kernel - CVE-2026-46321
Published: June 10, 2026
Vulnerability identifier: #VU134176
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-2026-46321
CWE-ID: CWE-401
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 memory leak in tun_xdp_one() in the tun driver when processing short frames through the tun and vhost-net transmit path. A local user can submit TX descriptors whose payload length is shorter than ETH_HLEN to exhaust host memory and trigger an OOM panic.
Exploitation requires the ability to open /dev/net/tun and /dev/vhost-net and to attach a tun/tap device as the vhost-net backend.
How to mitigate CVE-2026-46321
Install security update from vendor's repository.