CVE-2026-63992 | In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_
In the Linux kernel, the following vulnerability has been resolved:
tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
In some cases, iptunnel_pmtud_check_icmp() can be called while
skb transport header is not set.
This triggers an out-of-bound access, because
(typeof(skb->transport_header))~0U is 65535.
Access the icmp header based on IPv4 network header,
after making sure icmp->type is present in skb linear part.
Note that iptunnel_pmtud_check_icmpv6()) is fine.
- 🔗 git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77…
- 🔗 git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c…
- 🔗 git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2…
- 🔗 git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a5…
- 🔗 git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5…
- 🔗 git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43…
- 🔗 git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf21…
- 🔗 git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c1…
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CVE-2026-63992 | In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_
In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. Th
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