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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
See what this means
CVSS v3 Base Score
4.7
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core kernel 2021-07-14 20:35 ALAS2-2021-1685
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:37 ALAS2KERNEL-5.10-2022-002
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-20 19:03 ALAS2KERNEL-5.4-2022-006

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

References

Red Hat: CVE-2021-33624 Mitre: CVE-2021-33624 FAQs regarding Amazon Linux ALAS/CVE Severity