vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68299
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:19 UTC
Updated2026-08-19 17:20:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004460000 probability, percentile 0.372950000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc fbab6b73cc086e32698c86e43d1b16bf17d24c36 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 28e382646417c7e2be9c9a7079eddf627ff52b90 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 4fdb0f162ccdbe9626863b10003855703253fa29 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc b28596baf87e25a078789f1c05817c8a3bf71257 git Not specified
CNA Linux Linux affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc 34a71f5361fc3adb5b7138da78750b0d535a8252 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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