What’s Vulnerable › Vulnerabilities

CVE-2021-33200

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.

Affected products

How to fix

Upgrade to a fixed version: Linux kernel 5.10.41, 5.12.8, 5.4.123. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-33200 or the next vulnerability affects your stack