{"id":"CVE-2026-68299","title":"vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets\n\nvmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the\nouter header, but for a Geneve-e…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < fbab6b73cc086e32698c86e43d1b16bf17d24c36","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 28e382646417c7e2be9c9a7079eddf627ff52b90","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 4fdb0f162ccdbe9626863b10003855703253fa29","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < b28596baf87e25a078789f1c05817c8a3bf71257","Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 34a71f5361fc3adb5b7138da78750b0d535a8252","Linux 4.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:46:52.382602Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:07.239Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68299","references":[{"url":"https://git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0"},{"url":"https://git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36"},{"url":"https://git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90"},{"url":"https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38"},{"url":"https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8"},{"url":"https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29"},{"url":"https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257"},{"url":"https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252"}],"tags":["cve.org"],"epss":0.00501,"epssPercentile":0.41582,"ingestedAt":"2026-10-16T17:24:46.856Z","slug":"CVE-2026-68299","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets\n\nvmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the\nouter header, but for a Geneve-encapsulated packet the device can set\nthem based on the inner header instead, signalled by the\nVMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the\nfunction never skips the outer encapsulation, this mismatch triggers:\n\n- BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP), because the outer\n  protocol is UDP (Geneve), not TCP.\n- BUG_ON(hdr.eth->h_proto != ...), when the tunnel's outer and inner\n  IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa).\n\nCheck VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the\nfunction cannot locate the inner header it would need to parse. Also\nconvert the remaining BUG_ON()s in this function to return 0\ndefensively.\n\n## Affected\n\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < fbab6b73cc086e32698c86e43d1b16bf17d24c36`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 28e382646417c7e2be9c9a7079eddf627ff52b90`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 4fdb0f162ccdbe9626863b10003855703253fa29`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < b28596baf87e25a078789f1c05817c8a3bf71257`\n- `Linux >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc < 34a71f5361fc3adb5b7138da78750b0d535a8252`\n- `Linux 4.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}