CVE-2021-33624
Public on 2021-06-23
Modified on 2024-03-01
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.
Severity
Medium
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | No Fix Planned | ||
| Amazon Linux 2 - Kernel-5.15 Extra | kernel | Not Affected | ||
| Amazon Linux 2 - Core | kernel | 2021-07-14 | ALAS2-2021-1685 | Fixed |
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2022-01-20 | ALAS2KERNEL-5.10-2022-002 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-01-20 | ALAS2KERNEL-5.4-2022-006 | Fixed |
| Amazon Linux 2023 | kernel | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | CVSSv2 | 4.7 | AV:L/AC:M/Au:N/C:C/I:N/A:N |
| NVD | CVSSv3 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |