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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_pmtud_check_icmpv6()) is fine.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d745ef91622a4bb51dfdcebbc46ea697722c2fb0894e288ce19b066038e48089
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/ip_tunnel_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5a92cb45e34749865d03daf8d3500f77b5f6644c","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"c7b7ec3e69e673c0d6b57f74d21da50c485c598e","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"7f4f7efe7f30edd29c4988de01728bf2398217e4","status":"affected","version":"4cb47a8644cc9eb8ec81…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/ip_tunnel_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.9"},{"lessThan":"5.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessT…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/ip_tunnel_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5a92cb45e34749865d03daf8d3500f77b5f6644c","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"c7b7ec3e69e673c0d6b57f74d21da50c485c598e","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"7f4f7efe7f30edd29c4988de01728bf2398217e4","status":"affected","version":"4cb47a8644cc9eb8ec81…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/ip_tunnel_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.9"},{"lessThan":"5.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessT…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/metrics/0/cvssV3_1

Source references

8 source assertions
{"url":"https://git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77b5f6644c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:30402cf2592d5c116ca845616a1d0637e403e30c705f807f5bd96815ce812da3 · sha256:8de77a8aa087d14f… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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