CVE-2021-33624
MEDIUM 4.7EPSS 0.9%
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 v3.1 NVD
- 4.7 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS v2.0 NVD
- 4.7 MEDIUM
AV:L/AC:M/Au:N/C:C/I:N/A:N - EPSS
- 0.92% chance of exploitation in the next 30 days, 60th percentile
- Published
- 2021-06-23
- Updated
- 2026-10-08
Proof-of-concept exploits (2)
- Kakashiiiiy/CVE-2021-336244★ · 2021-08-02
- benschlueter/CVE-2021-336244★ · 2021-08-02
Security advisories
- http://www.openwall.com/lists/oss-security/2021/06/21/1
- torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner