CVE-2021-33624

medium

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.

References

https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner

http://www.openwall.com/lists/oss-security/2021/06/21/1

https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db

https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html

Details

Source: MITRE

Published: 2021-06-23

Updated: 2021-11-12

Type: CWE-203

Risk Information

CVSS v2

Base Score: 4.7

Vector: AV:L/AC:M/Au:N/C:C/I:N/A:N

Impact Score: 6.9

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 4.7

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 1

Severity: MEDIUM