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Oracle Linux: (CVE-2021-33200) ELSA-2021-4356: kernel security, bug fix, and enhancement update

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Oracle Linux: (CVE-2021-33200) ELSA-2021-4356: kernel security, bug fix, and enhancement update

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
05/27/2021
Created
11/20/2021
Added
11/18/2021
Modified
11/18/2021

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.

Solution(s)

  • oracle-linux-upgrade-kernel

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