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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3490 Detail

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).


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

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

Known Affected Software Configurations Switch to CPE 2.2

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Change History

7 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3490
NVD Published Date:
06/03/2021
NVD Last Modified:
11/21/2024
Source:
Canonical Ltd.