CVE-2021-4001

CVE-2021-4001 updated by NVD

Modified

2026-10-10

Sources

nvd

Summary

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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-4001