CVE-2021-4001: Race Condition
First published: Mon Nov 22 2021(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=5.15 | |
| Linux Linux kernel | =5.16-rc1 | |
| redhat/kernel | <5.16 | 5.16 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2025645
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53
- https://launchpad.net/bugs/cve/CVE-2021-4001
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2025646
- https://git.kernel.org/linus/353050be4c19e102178ccc05988101887c25ae53
- https://security-tracker.debian.org/tracker/CVE-2021-4001
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4001
- https://nvd.nist.gov/vuln/detail/CVE-2021-4001
- https://ubuntu.com/security/CVE-2021-4001
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