CVE-2026-68299vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
- 7.5HighCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 56% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < fbab6b73cc086e32698c86e43d1b16bf17d24c36
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 28e382646417c7e2be9c9a7079eddf627ff52b90
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 4fdb0f162ccdbe9626863b10003855703253fa29
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < b28596baf87e25a078789f1c05817c8a3bf71257
- affected 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc – < 34a71f5361fc3adb5b7138da78750b0d535a8252
- affected 4.2
- unaffected < 4.2
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0 (opens in a new tab)
- https://git.kernel.org/stable/c/fbab6b73cc086e32698c86e43d1b16bf17d24c36 (opens in a new tab)
- https://git.kernel.org/stable/c/28e382646417c7e2be9c9a7079eddf627ff52b90 (opens in a new tab)
- https://git.kernel.org/stable/c/667b6e52048eaf4dbcf1707ed87ffd44abb9cb38 (opens in a new tab)
- https://git.kernel.org/stable/c/28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8 (opens in a new tab)
- https://git.kernel.org/stable/c/4fdb0f162ccdbe9626863b10003855703253fa29 (opens in a new tab)
- https://git.kernel.org/stable/c/b28596baf87e25a078789f1c05817c8a3bf71257 (opens in a new tab)
- https://git.kernel.org/stable/c/34a71f5361fc3adb5b7138da78750b0d535a8252 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55400 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-68299)Record last updated .