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CVE-2024-26921 is a use-after-free condition in the Linux kernel IPv4 fragment defragmentation path. When an skb fragment is reassembled during transmit-path processing, inet_defrag could orphan the skb and release its associated socket while downstream code still uses skb->sk. This can affect fragments reassembled by netfilter and comparable modules, including Open vSwitch and ct_act. The fix delays orphaning until the reassembly engine determines whether the skb must be queued; for a completed reassembly queue, it preserves and reattaches the socket reference to the head skb and corrects socket write-memory accounting.
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What an attacker gets, and what they’ve been doing with it.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel inet_defrag lifetime-management flaw addressed by preventing socket release while it remains in use.
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A Linux kernel inet_defrag flaw involving release of a socket (sk) while it remains in use. The issue has been resolved upstream and addressed through Red Hat Enterprise Linux security advisories.
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.