CVE-2026-63994
tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 19, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new unknown vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Linux / Linux
4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 95b6d772bfe788331d9742d73eaa12e113b2adc4 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 7254aef4d1a7e18e887af9010e2f2dc34806789b 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < bf8b3f34c37c162357138e7c0942723b8b94fed1 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 76cd9398a0470257ab765bdf5f358a2af2e17934 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 50750d86a2e5266aba0c295483b3397843198b11 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 6dff77899b9e9fe5d854abda3a98ad04e7229ef7 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < f3f204541f280a6ecb04503a0d6794d93990ca43 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < b4bc94353050b1fa7b702bd4c6600710dd926cff
Linux / Linux
5.9
References
git.kernel.org: https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4 git.kernel.org: https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b git.kernel.org: https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1 git.kernel.org: https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934 git.kernel.org: https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11 git.kernel.org: https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7 git.kernel.org: https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43 git.kernel.org: https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff