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 .0052 42.1 —
AFFECTED Product Versions Fixed Linux 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – — Linux 5.9 – 5.15.179
TIMELINE Dec 29 Reserved by Linux Feb 27 Published (CNA: Linux) Jul 30 RESCORED — CVE-2025-21766 (Linux). CVSS 8.1 → 5.5 (NVD).
In the Linux kernel, the following vulnerability has been resolved: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.
| Date | Event | Detail |
|---|---|---|
| December 29, 2024 | Reserved | Reserved by Linux |
| February 27, 2025 | Published | Published (CNA: Linux) |
| July 30, 2026 | RESCORED | RESCORED — CVE-2025-21766 (Linux). CVSS 8.1 → 5.5 (NVD). |
Authoritative record: CVE-2025-21766 at cve.org
Vendors: linux
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-21766 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.