Disclosure 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.
Source-reported weakness categories
CWE-367
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2021-4001
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| linux | linux_kernel | * {"versionEndIncluding":"5.15"} |
| linux | linux_kernel | 5.16 |
Original records & references
- NIST NVD record
- CVE Program record
- bugzilla.redhat.com — Issue Tracking, Patch, Third Party Advisory
- git.kernel.org — Patch, Third Party Advisory
- bugzilla.redhat.com — Issue Tracking, Patch, Third Party Advisory
- git.kernel.org — Patch, Third Party Advisory
PUBLISHED 2022-01-21T14:15:09-05:00
MODIFIED 2026-10-08T17:17:42-04:00
INGESTED 2026-10-10T20:50:21-04:00