CVE-2026-68299vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc builds before 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0; from 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc before fbab6b73cc086e32698c86e43d1b16bf17d24c36; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc builds before 28e382646417c7e2be9c9a7079eddf627ff52b90; from 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc before 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc builds before 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc builds before 4fdb0f162ccdbe9626863b10003855703253fa29; from 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc before b28596baf87e25a078789f1c05817c8a3bf71257; 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc builds before 34a71f5361fc3adb5b7138da78750b0d535a8252 | CNA record |
References
- https://git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0
- https://git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36
- https://git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90
- https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38
- https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8
- https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29
- https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257
- https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.