CVE-2021-33200

 

Published at: - 27-05-2021 03:15

Last modified: - 26-10-2022 01:44

Total changes: - 7

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://www.openwall.com/lists/oss-security/2021/05/27/1
• FEDORA-2021-0b35886add-Mailing List, Third Party Advisory
• FEDORA-2021-646098b5b8-Mailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210706-0004/

 

Keywords

NVD

 

CVE-2021-33200

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures