VULNERABILITY INTELLIGENCE

CVE-2021-47109

CVSS score7.5 HIGH
EPSS probability0.69%
CISA KEVNot currently listed
Published2024-03-15
Last modified2026-08-04
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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'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.

Weakness classification

  • nvd@nist.gov: CWE-190

Primary references