CVE-2026-45932 bpf: Fix tcx/netkit detach permissions when prog fd isn't given
Unprivileged users can detach BPF programs from tcx/netkit devices without proper permission checks, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45932?
CVE-2026-45932 is a high-severity missing authorization vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix tcx/netkit detach permissions when prog fd isn't given
This commit fixes a security issue where BPF_PROG_DETACH on tcx or netkit devices could be executed by any user when no program fd was provided, bypassing permission checks. The fix adds a capability check for CAP_NET_ADMIN or CAP_SYS_ADMIN in this case.
Which versions are affected by CVE-2026-45932?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45932?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-45932 being exploited?
There is no known exploitation of CVE-2026-45932 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88751, BELL-CVE-2026-45932, DEBIAN-CVE-2026-45932, GHSA-p87w-4q4g-fjpw, ROOT-OS-DEBIAN-13-CVE-2026-45932, ROOT-OS-UBUNTU-2404-CVE-2026-45932 and 1 more.