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CVE-2021-4001

Published: Jan 21, 2022

Modified: Aug 3, 2024

PUBLISHED

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.

Vendor	Product	Versions
n/a	kernel	affected `kernel 5.16 rc2`

Weaknesses (CWE)

References

https://bugzilla.redhat.com/show_bug.cgi?id=2025645

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53

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