CVE-2021-4001EPSS p7.6%
CVE-2021-4001CVE-2021-4001
linux / linux_kernel
Description
A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to a missing lock in kernel/bpf/syscall.c. In this flaw, a local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. This flaw affects kernel versions prior to 5.16 rc2.
Scoring
| CVSS | 4.1 () |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N |
| EPSS | 0.19% probability of exploitation · percentile 7.6% · 2026-10-10T12:00:23Z |
| Last modified | 2026-10-08 |