QwikSec

Security Database

CVE

CWE

Training

CVE Database
/

CVE-2021-47109

Back to search

CVE-2021-47109

Published: Mar 15, 2024

Modified: May 11, 2026

PUBLISHED

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.

VendorProductVersions

Linux

Linux

affected
58956317c8de52009d1a38a721474c24aef74fe7 - < d99029e6aab62aef0a0251588b2867e77e83b137
affected
58956317c8de52009d1a38a721474c24aef74fe7 - < d17d47da59f726dc4c87caebda3a50333d7e2fd3
affected
58956317c8de52009d1a38a721474c24aef74fe7 - < ddf088d7aaaaacfc836104f2e632b29b1d383cfc
affected
58956317c8de52009d1a38a721474c24aef74fe7 - < 7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f

Linux

Linux

affected
5.0
unaffected
0 - < 5.0
unaffected
5.4.125 - <= 5.4.*
unaffected
5.10.43 - <= 5.10.*
unaffected
5.12.10 - <= 5.12.*

+1 more versions

References

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now