CVE•Published 2026-07-19•Modified 2026-07-30•1 article on news•4 live references•NVD data
CVE-2026-63994
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
41
Exploit Prediction Scoring System · top 59% of all CVEs
Description
In the Linux kernel, the following vulnerability has been resolved: tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]() Sashiko found that iptunnel_pmtud_build_icmp() and iptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr() before an skb_cow() call which can reallocate skb->head. Fix this possible UAF by initializing the local variables after the skb_cow() call. Remove skb_reset_network_header() calls which were not needed.
Timeline
Published 2026-07-19
Modified 2026-07-30
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-63994Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-63994Censys host search filtered to this CVE id.
grep.app
CVE-2026-63994Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-63994GitHub code search for direct mentions.
Google dork
"CVE-2026-63994" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-63994 on GitHub.