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LIN1021-396 : Security Advisory - linux - CVE-2021-33200

Created: May 27, 2021    Updated: Jul 12, 2021
Resolved Date: Jul 12, 2021
Found In Version: 10.21.20.1
Fix Version: 10.21.20.1
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Kernel

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.

CREATE(Triage):(User=admin) [CVE-2021-33200|https://nvd.nist.gov/vuln/detail/CVE-2021-33200]

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