CVE-2026-23319

A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) component. This use-after-free (UAF) vulnerability allows a local user to trigger a condition in the bpf_trampoline_link_cgroup_shim function where a resource is freed but still referenced. This can lead to a system crash, resulting in a denial of service, or potentially enable privilege escalation.

This flaw affects systems using BPF with cgroup trampolines. The race condition occurs between bpf_link_put() releasing a shim link and another process looking it up via cgroup_shim_find(). The deferred cleanup of tr->progs_hlist creates a window for use-after-free. Exploitation requires BPF privileges and concurrent operations on cgroup BPF programs. Actual only for ARM platform.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.