CVE-2021-4001
Medium
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.
SeverityMedium
CVSS4.1
Exploit probability—
Product
Linux Kernel
PublishedJan 21, 2022
First seenJan 21, 2022
Weakness typeCWE-367CWE-367
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v ≤ 5.15, 5.16 | — |
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