NULL pointer dereference in Linux kernel - CVE-2026-74684
Published: August 24, 2026
Vulnerability identifier: #VU144673
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-74684
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in tap_get_user_xdp() when parsing a virtio-net header from an XDP buffer before assigning skb->dev. A local user can provide a crafted XDP buffer with a GSO virtio-net header and a zero protocol value to cause a denial of service.
The issue is triggered on the vhost TX path.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74684
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1