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CVE-2026-63993

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4b0580ce25639fdb023853679eacf51899626f7a96c61624283f2de446f17ee7
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":["drivers/net/vxlan/vxlan_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6b8bfce9d2f774d2c2243e0248e03efb99bba6c0","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"9257f56ac47ef1976bcd056cf986a9988eeec67a","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"8d435d68d71fb875876b722f4136caf74f2f48bd","status":"affected","version":"4cb47a8644cc9eb…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/vxlan/vxlan_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"},{"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/vxlan/vxlan_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6b8bfce9d2f774d2c2243e0248e03efb99bba6c0","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"9257f56ac47ef1976bcd056cf986a9988eeec67a","status":"affected","version":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f","versionType":"git"},{"lessThan":"8d435d68d71fb875876b722f4136caf74f2f48bd","status":"affected","version":"4cb47a8644cc9eb…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/vxlan/vxlan_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"},{"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/metrics/0/cvssV3_1

Source references

8 source assertions
{"url":"https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:89070ed0e0c25620153e3946d3d8ed371d7a4354bda859c26365228c85692fd7 · sha256:8c2182dd2c0f3979… · /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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