Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-02-27. NVD baseline CVSS 7.8; sources differ by 0.0.
A fix is available — apply it.
In the Linux kernel, the following vulnerability has been resolved:
ipv6: mcast: extend RCU protection in igmp6_send()
igmp6_send() can be called without RTNL or RCU being held.
Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF.
Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.
Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
February 27, 2025
March 24, 2025
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
ipv6: mcast: extend RCU protection in igmp6_send()
Red Hat Security Advisory: kernel security update
Red Hat Security Advisory: kernel security update
Red Hat Security Advisory: kernel security update
Red Hat Security Advisory: kernel security update
Red Hat Security Advisory: kernel security update
Red Hat Security Advisory: kernel-rt security update
Red Hat Security Advisory: kernel security update
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
RHSA-2025:11245 — Moderate
RHSA-2025:12209 — Moderate
RHSA-2025:12311 — Moderate
Linux kernel vulnerabilities
Linux kernel (AWS) vulnerabilities
Linux kernel vulnerabilities
Linux kernel vulnerabilities
Linux kernel vulnerabilities
Linux kernel (Oracle) vulnerabilities
Linux kernel vulnerabilities
Linux kernel (Raspberry Pi Real-time) vulnerabilities
Linux kernel (Azure) vulnerabilities
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Explore the affected products and dependency analysis for CVE-2025-21759
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.