CVE-2021-33200

HIGH Year: 2021
CVSS v3 Score
7.8
High
CVSS v2 Score
7.2
High
Weakness Type
CWE-787
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Vulnerability Description

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

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