NULL pointer dereference in Linux kernel - CVE-2026-64207
Published: July 21, 2026
Vulnerability identifier: #VU138913
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-2026-64207
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 qfq_dequeue() and qfq_peek_skb() when processing GSO packets through DualPI2 with QFQ as the parent qdisc. A local user can trigger GSO packet segmentation and packet dequeue operations to cause a denial of service.
Exploitation requires DualPI2 to split a GSO skb and QFQ to be configured as the parent qdisc.
Affected software
Linux kernel
How to mitigate CVE-2026-64207
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3