CVE-2021-47109

Severity CVSS v4.0:

Pending analysis

Type:

CWE-190 Integer Overflow or Wraparound

Publication date:

15/03/2024

Last modified:

27/02/2025

Description

In the Linux kernel, the following vulnerability has been resolved: neighbour: allow NUD_NOARP entries to be forced GCed IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It&#39;s possible to fill up the neighbour table with enough entries that it will overflow for valid connections after that. This behaviour is more prevalent after commit 58956317c8de ("neighbor: Improve garbage collection") is applied, as it prevents removal from entries that are not NUD_FAILED, unless they are more than 5s old.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	5.0 (including)	5.4.125 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.43 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.12.10 (excluding)
cpe:2.3:o:linux:linux_kernel:5.13:rc1::::::
cpe:2.3:o:linux:linux_kernel:5.13:rc2::::::
cpe:2.3:o:linux:linux_kernel:5.13:rc3::::::
cpe:2.3:o:linux:linux_kernel:5.13:rc4::::::
cpe:2.3:o:linux:linux_kernel:5.13:rc5::::::
cpe:2.3:o:linux:linux_kernel:5.13:rc6::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47109

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools