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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < fbab6b73cc086e32698c86e43d1b16bf17d24c36; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 28e382646417c7e2be9c9a7079eddf627ff52b90; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 4fdb0f162ccdbe9626863b10003855703253fa29; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < b28596baf87e25a078789f1c05817c8a3bf71257; >= 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc, < 34a71f5361fc3adb5b7138da78750b0d535a8252 |
| Linux | Linux | 4.2 |
References
- https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8
- https://git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90
- https://git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0
- https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252
- https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29
- https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38
- https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257
- https://git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36
Timeline
- Published
- Aug 10, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received