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CVE-2023-53821 is a use-after-free vulnerability in the Linux kernel ip6_vti component's decode_session6 path. When an IPv6 VTI device uses an SFB queueing discipline, enqueue processing can modify the skb control buffer. During subsequent IPv6 packet transmission, decode_session6 can use the modified control-buffer data, resulting in a read from freed skbuff memory. The underlying issue is that xfrm_decode_session was intended for receive-path processing, whereas IP6CB(skb)->nhoff is not initialized during transmission.
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No public exploit code observed for this vulnerability.
36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as affecting packages covered by the TuxCare CentOS Linux 8.5 advisory; no technical vulnerability details are provided.
Referenced as one of many vulnerabilities addressed by SUSE security updates.
A vulnerability fixed by the referenced SUSE kernel update.
A vulnerability listed as fixed by a SUSE security update affecting kernel-source-rt packages for SUSE Linux Micro 6.0 and 6.1.
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.