CVE-2025-71085
- Published: 2026-01-13T16:16:08.117
In the Linux kernel, the following vulnerability has been resolved:
ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()
There exists a kernel oops caused by a BUG_ON(nhead INT_MAX
(i.e. (int)(skb_headroom(skb) + len_delta) skb_headroom(skb)) is meant to ensure
that delta = headroom – skb_headroom(skb) is never negative, otherwise
we will trigger a BUG_ON in pskb_expand_head(). However, if
headroom > INT_MAX and delta cmsg_len = cmsg_len;
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_HOPOPTS;
char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);
hop_hdr[1] = 0x9; //set hop size – (0x9 + 1) * 8 = 80
sendmsg(fd, &msg, 0);
Related CVE by CWE
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How to fix CVE-2025-71085
Description: In the Linux kernel, the following vulnerability has been resolved: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by a BUG_ON(nhead INT_MAX (i.e. (int)(skb_headroom(skb) + len_delta) skb_headroom(skb)) is meant to ensure that delta = headroom – skb_headroom(skb) is never negative, otherwise we will trigger a BUG_ON in pskb_expand_head(). However, […]
Exploit Difficulty: HARD
⏱️ Time to exploit: > 4 hours
🛠️ Required skills: Advanced security expertise
💰 Public exploits: Rare or not public
How to Fix:
- Check if you're running the affected product
- Update to the latest patched version
- If patching is not immediately possible: restrict network exposure, apply least-privilege access
- Test the fix in a staging environment first
- Review logs for signs of exploitation
- Monitor for IOCs (Indicators of Compromise)
- Enable automatic security updates
- Set up vulnerability monitoring
- Review and harden security configurations
Exploit Difficulty Assessment
Vulnerability Timeline
CVE details first published to NVD database
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Detection Rules & IOCs
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No vendor/product data available.