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CVE-2025-71085 is an integer-overflow vulnerability in the Linux kernel IPv6 CALIPSO packet-attribute path. In calipso_skbuff_setattr(), an oversized headroom calculation can be passed to skb_cow(). An implicit integer cast in __skb_cow() can cause a headroom value greater than INT_MAX to wrap, yielding a negative delta that is supplied as nhead to pskb_expand_head(). This reaches BUG_ON(nhead < 0), causing a kernel oops.
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No public exploit code observed for this vulnerability.
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41 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel IPv6 vulnerability involving a BUG() condition in pskb_expand_head() during calipso_skbuff_setattr(), addressed by the Rocky Linux 9 CIQ CRLSA-2026_3488 security update.
A Linux kernel IPv6 vulnerability involving a BUG() condition in pskb_expand_head() during calipso_skbuff_setattr() processing. It affects Rocky Linux 8 kernel packages covered by CIQ advisory crlsa-2026_3963.
A vulnerability addressed by the referenced CentOS/TuxCare security advisory.
Vulnerability referenced by the advisory; no individual description is provided.
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.