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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3489 Detail

Description

The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 3.x Severity and Vector Strings:

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

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea Patch  Vendor Advisory 
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea Patch  Vendor Advisory 
https://security.netapp.com/advisory/ntap-20210716-0004/ Third Party 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-4949-1 Third Party Advisory 
https://ubuntu.com/security/notices/USN-4950-1 Third Party Advisory 
https://ubuntu.com/security/notices/USN-4950-1 Third Party Advisory 
https://www.openwall.com/lists/oss-security/2021/05/11/10 Mailing List  Third Party Advisory 
https://www.openwall.com/lists/oss-security/2021/05/11/10 Mailing List  Third Party Advisory 
https://www.zerodayinitiative.com/advisories/ZDI-21-590/ Third Party Advisory  VDB Entry 
https://www.zerodayinitiative.com/advisories/ZDI-21-590/ 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-119 Improper Restriction of Operations within the Bounds of a Memory Buffer Canonical Ltd.  

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
   Show Matching CPE(s) 		From (including)
5.8		Up to (excluding)
5.10.37
 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
   Show Matching CPE(s) 		From (including)
5.11		Up to (excluding)
5.11.21
 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
   Show Matching CPE(s) 		From (including)
5.12		Up to (excluding)
5.12.4
 cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*
   Show Matching CPE(s)
 cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
   Show Matching CPE(s)
 cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
   Show Matching CPE(s)
 cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
   Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
   Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:*
   Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*
   Show Matching CPE(s)

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3489
NVD Published Date:
06/03/2021
NVD Last Modified:
11/21/2024
Source:
Canonical Ltd.