CVE-2026-63994 (GCVE-0-2026-63994)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-10-19 20:18
Severity ?
Summary
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.
Impacted products
Vendor Product Version
Linux Linux Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
Version: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f
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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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