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CVE-2025-21764 is a potential use-after-free vulnerability in the Linux kernel's IPv6 Neighbor Discovery code. The ndisc_alloc_skb() function can be called without the RTNL lock or RCU protection being held, allowing a possible use-after-free condition. The fix adds RCU protection within the function. Exploitation could cause kernel memory corruption and denial of service; possible confidentiality and integrity impacts remain dependent on platform-specific exploitability.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel vulnerability involving missing RCU protection in ndisc_alloc_skb(), potentially causing a use-after-free. The advisory identifies affected Google COS kernel packages and rates the vulnerability High, with a CVSS v3 base score of 7.8. The supplied vector indicates local access and low privileges are required, with potentially high confidentiality, integrity, and availability impacts.
A Linux kernel Neighbor Discovery (ndisc) use-after-free vulnerability caused by ndisc_alloc_skb() being callable without RTNL or RCU protection.
A Linux kernel use-after-free vulnerability in the IPv6 Neighbor Discovery (ndisc) allocation path, caused by ndisc_alloc_skb() potentially executing without RTNL or RCU protection.
A Linux kernel use-after-free vulnerability in ndisc_alloc_skb() caused by calls occurring without RTNL or RCU protection. The referenced Google COS lakitu-kernel packages are affected and should be updated to version 17800.436.91 or later.
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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.