Improper access control in Linux kernel - CVE-2026-74736
Published: August 27, 2026
Vulnerability identifier: #VU145992
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74736
CWE-ID: CWE-284
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 improper access control in cls_bpf_prog_from_efd() in net/sched/cls_bpf.c when attaching a device-bound bpf classifier program to a network device via cls_bpf with skip_sw. A local user can attach a program bound to a different device and then delete the original device to cause a denial of service.
The issue can trigger a kernel warning and may panic the system when panic_on_warn=1.
Affected software
Linux kernel
How to mitigate CVE-2026-74736
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e
- https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e
- https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf
- https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301
- https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661