National Vulnerability Database

National Vulnerability Database

NVD

  1. Vulnerabilities

CVE-2021-3490 Detail

Current Description

The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).


View Analysis Description

Severity

 


CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.8 HIGH
Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Nist CVSS score does not match with CNA score
CNA:  Canonical Ltd.
Base Score:  7.8 HIGH
Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html Exploit  Third Party Advisory  VDB Entry 
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e Patch  Vendor Advisory 
https://security.netapp.com/advisory/ntap-20210716-0004/ Third Party Advisory 
https://ubuntu.com/security/notices/USN-4949-1 Third Party Advisory 
https://ubuntu.com/security/notices/USN-4950-1 Third Party Advisory 
https://www.openwall.com/lists/oss-security/2021/05/11/11 Mailing List  Patch  Third Party Advisory 
https://www.zerodayinitiative.com/advisories/ZDI-21-606/ Third Party Advisory  VDB Entry 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write cwe source acceptance level NIST   Contributor acceptance level Canonical Ltd.  
CWE-125 Out-of-bounds Read cwe source acceptance level NIST  
CWE-20 Improper Input Validation Contributor acceptance level Canonical Ltd.  

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3490
NVD Published Date:
06/03/2021
NVD Last Modified:
09/14/2021
Source:
Canonical Ltd.