CVE-2026-68299

CVE CVE-2026-68299EUVD EUVD-2026-55400Published 2026-08-10T12:02:33.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets vmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the outer header, but for a Geneve-encapsulated packet the device can set them based on the inner header instead, signalled by the VMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the function never skips the outer encapsulation, this mismatch triggers: - BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP), because the outer protocol is UDP (Geneve), not TCP. - BUG_ON(hdr.eth->h_proto != ...), when the tunnel's outer and inner IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa). Check VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the function cannot locate the inner header it would need to parse. Also convert the remaining BUG_ON()s in this function to return 0 defensively.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.12.101; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc <667b6e52048eaf4dbcf1707ed87ffd44abb9cb38; patch: 7.1.6; patch: 6.18.42; patch: 7.2-rc5; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc <4fdb0f162ccdbe9626863b10003855703253fa29; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc <34a71f5361fc3adb5b7138da78750b0d535a8252; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc <b28596baf87e25a078789f1c05817c8a3bf71257; 4.2; patch: 0; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc <28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8; patch: 6.6.148

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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