NULL pointer dereference in Linux kernel - CVE-2026-68337
Published: August 12, 2026
Vulnerability identifier: #VU141708
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-2026-68337
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 the bpf_redirect helpers and skb_do_redirect() when processing tc BPF programs attached to a proper qdisc without a bpf_net_context. A local user can attach or run a BPF program that calls a redirect helper or returns TC_ACT_REDIRECT to cause a denial of service.
The issue occurs on qdisc paths where tc BPF execution does not establish the required per-task network context.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-68337
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.111-1
linux (Debian package) - update to 6.12.111-1