Loading vulnerability…
CVE-2025-21759 is a potential use-after-free vulnerability in the Linux kernel IPv6 multicast implementation. The igmp6_send() function can execute without the RTNL lock or read-copy-update (RCU) protection held, making retrieval of the network namespace pointer unsafe. The fix extends RCU protection around pointer access and socket accounting. It also replaces sock_alloc_send_skb() with alloc_skb() because the IPv6 IGMP socket uses GFP_KERNEL allocations that can sleep. The flaw can potentially cause memory corruption or a kernel crash.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A potential use-after-free vulnerability in the Linux kernel's IPv6 multicast function igmp6_send(), caused by insufficient RCU protection when accessing the network namespace pointer. The fix extends RCU protection and changes socket-buffer allocation handling. The reference assigns a CVSS v3 base score of 7.8, indicating local exploitation requiring low privileges and potentially high confidentiality, integrity, and availability impacts.
A Linux kernel IPv6 multicast issue involving insufficient RCU protection in igmp6_send(), affecting the Rocky Linux 10.0 kernel packages covered by CIQ advisory crlsa-2025_10371.
A Linux kernel IPv6 multicast issue involving RCU protection in igmp6_send(), addressed by the CIQ/Rocky Linux advisory.
A high-severity Linux kernel IPv6 multicast vulnerability in igmp6_send() that could result in a use-after-free condition because the function may be invoked without RTNL or RCU protection.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.