Side-channel attack vulnerability in Linux kernel's BPF verifier (CID-9183671af6db)

Side-channel attack vulnerability in Linux kernel's BPF verifier (CID-9183671af6db)

CVE-2021-33624 · MEDIUM Severity

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

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.

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