{"id":"CVE-2026-63993","revision":"30db0077f94840698971f0e9c091b247","records":[{"revision":"30db0077f94840698971f0e9c091b247","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63993","aliases":[],"title":"vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()\n\nskb_tunnel_check_pmtu() can change skb->head.\n\nReusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF.\n\nUse instead ip_hdr(skb) as done in drivers/net/bareudp.c\nand drivers/net/geneve.c.\n\nFound by Sashiko.","state":0,"publishedAt":"2026-07-19T14:56:13.218+00:00","modifiedAt":"2026-10-19T20:18:01.347+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/vxlan/vxlan_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"6b8bfce9d2f774d2c2243e0248e03efb99bba6c0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"9257f56ac47ef1976bcd056cf986a9988eeec67a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"8d435d68d71fb875876b722f4136caf74f2f48bd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"dc3bfa050f873371e745bdf478b1f5b738e5733d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"609e63312c29aad18026a1d3222e123d4b6b0feb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"5303925e360527243b46a440a04667826bbc72b7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"a493efd4336cf19122ae0e4cbb3d31b32d70deea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4cb47a8644cc9eb8ec81190a50e79e6530d0297f\",\n                            \"lessThan\": \"7d9ef0cb271555d8cf39fefe6c981e1493b25ecf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/vxlan/vxlan_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0","https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a","https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd","https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d","https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb","https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7","https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea","https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63993","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63993","identifiers":["CVE-2026-63993"]},"retained":false,"historicalAffected":[]}],"coverage":[]}