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CVE-2024-26921 is a use-after-free vulnerability in the Linux kernel IPv4 fragmentation and reassembly path, inet_defrag. When IP fragments are reassembled in the transmit/output path, ip_defrag() could orphan an skb and release its associated socket while downstream output-path processing still uses skb->sk. This can occur with fragment reassembly invoked by netfilter or similar transmit-pipeline components, including Open vSwitch and connection-tracking action processing. The fix defers skb orphaning until it is known that the skb will remain queued, preserves the socket reference for a completed reassembly queue by transferring it to the reassembled head skb, and corrects socket write-memory accounting.
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No public exploit code observed for this vulnerability.
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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.