CVE-2026-68299

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Linux

PublishedAug 10, 2026

First seenAug 10, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

Linux Linux2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0, fbab6b73cc086e32698c86e43d1b16bf17d24c36, 28e382646417c7e2be9c9a7079eddf627ff52b90, 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38, 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8, 4fdb0f162ccdbe9626863b10003855703253fa29, b28596baf87e25a078789f1c05817c8a3bf71257, 34a71f5361fc3adb5b7138da78750b0d535a8252 or later

Affected products

Product	Affected versions	Fixed in
Linux Linux	45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < fbab6b73cc086e32698c86e43d1b16bf17d24c36, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 28e382646417c7e2be9c9a7079eddf627ff52b90, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 4fdb0f162ccdbe9626863b10003855703253fa29, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < b28596baf87e25a078789f1c05817c8a3bf71257, 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ≤ v < 34a71f5361fc3adb5b7138da78750b0d535a8252, 4.2	2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0, fbab6b73cc086e32698c86e43d1b16bf17d24c36, 28e382646417c7e2be9c9a7079eddf627ff52b90, 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38, 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8, 4fdb0f162ccdbe9626863b10003855703253fa29, b28596baf87e25a078789f1c05817c8a3bf71257, 34a71f5361fc3adb5b7138da78750b0d535a8252

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