Vulnerability Description
In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.12.13 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2021/06/21/1ExploitMailing ListThird Party Advisory
- https://github.com/benschlueter/CVE-2021-33624
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49dPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlIssue TrackingThird Party Advisory
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirznerThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/06/21/1ExploitMailing ListThird Party Advisory
- https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49dPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlIssue TrackingThird Party Advisory
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirznerThird Party Advisory
FAQ
What is CVE-2021-33624?
CVE-2021-33624 is a vulnerability with a CVSS score of 4.7 (MEDIUM). In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locat...
How severe is CVE-2021-33624?
CVE-2021-33624 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-33624?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.