Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: virt: tdx-guest: Fix handling of host controlled 'quote' buffer length Validate host controlled value `quote_buf->out_len` that determines how many bytes of the quote are copied out to guest userspace. In TDX environments with remote attestation, quotes are not considered private, and can be forwarded to an attestation server. Catch scenarios where the host specifies a response length larger than the guest's allocation, or otherwise races modifying the response while the guest consumes it. This prevents contents beyond the pages allocated for `quote_buf` (up to TSM_REPORT_OUTBLOB_MAX) from being read out to guest userspace, and possibly forwarded in attestation requests. Recall that some deployments want per-container configs-tsm-report interfaces, so the leak may cross container protection boundaries, not just local root.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.7, < 6.12.80 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89bPatch
- https://git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1Patch
- https://git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0Patch
- https://git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61Patch
FAQ
What is CVE-2026-31470?
CVE-2026-31470 is a vulnerability with a CVSS score of 7.1 (HIGH). In the Linux kernel, the following vulnerability has been resolved: virt: tdx-guest: Fix handling of host controlled 'quote' buffer length Validate host controlled value `quote_buf->out_len` that de...
How severe is CVE-2026-31470?
CVE-2026-31470 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31470?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.