Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L L N U N N H 5.5 .0068 49.8 —
AFFECTED Product Versions Fixed Linux 58956317c8de52009d1a38a721474c24aef74fe7 – — Linux 5.0 – 5.4.125
TIMELINE Mar 4 Reserved by Linux Mar 15 Published (CNA: Linux) Aug 4 RESCORED — CVE-2021-47109 (Linux). CVSS 7.5 → 5.5 (NVD).
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.
| Date | Event | Detail |
|---|---|---|
| March 4, 2024 | Reserved | Reserved by Linux |
| March 15, 2024 | Published | Published (CNA: Linux) |
| August 4, 2026 | RESCORED | RESCORED — CVE-2021-47109 (Linux). CVSS 7.5 → 5.5 (NVD). |
Authoritative record: CVE-2021-47109 at cve.org
Vendors: linux
Weaknesses: CWE-190
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-47109 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.