Loading vulnerability…
CVE-2025-71085 is an integer-conversion flaw in the Linux kernel IPv6 CALIPSO packet-label handling path. In calipso_skbuff_setattr(), an oversized calculated headroom value can be passed to skb_cow(). An implicit conversion in __skb_cow() can cause a headroom value exceeding INT_MAX to become negative. Although the headroom comparison succeeds, the resulting negative delta can be passed as the nhead argument to pskb_expand_head(), triggering its BUG_ON condition. The upstream fix changes calipso_skbuff_setattr() to invoke skb_cow() only when packet headroom must be grown.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
35 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel IPv6 vulnerability that can trigger a BUG() in pskb_expand_head() during calipso_skbuff_setattr().
A Linux kernel IPv6 vulnerability involving a BUG() in pskb_expand_head() as part of calipso_skbuff_setattr().
A Linux kernel IPv6 vulnerability involving a BUG() in pskb_expand_head() as part of calipso_skbuff_setattr().
A Linux kernel IPv6 vulnerability involving a BUG() in pskb_expand_head() as part of calipso_skbuff_setattr().
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.