Fixed
Created: May 27, 2021
Updated: Jun 15, 2021
Resolved Date: Jun 15, 2021
Found In Version: 10.18.44.1
Severity: Standard
Applicable for: Wind River Linux LTS 18
Component/s: Kernel
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.
CREATE(Triage):(User=admin) [CVE-2021-33200|https://nvd.nist.gov/vuln/detail/CVE-2021-33200]
