CVE-2021-33624

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

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

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

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

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3