linux: A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to...
CVE-2021-4001 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4001, released January 21, 2022. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.15.5-1 | DEBIAN-CVE-2021-4001 | Jan 21, 2022 |
| linux · Debian 13.5 (trixie) | 5.15.5-1 | DEBIAN-CVE-2021-4001 | Jan 21, 2022 |
| linux · Debian 14 | 5.15.5-1 | DEBIAN-CVE-2021-4001 | Jan 21, 2022 |
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