CVE-2026-31470virt: tdx-guest: Fix handling of host controlled 'quote' buffer length
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: 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
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f4738f56d1dc62aaba69b33702a5ab098f1b8c63 before a079a62883e3365de592cea9f7a669d8115433b0; from f4738f56d1dc62aaba69b33702a5ab098f1b8c63 before 6f3c8795ae9ba74fa10fe979293d1904712d3fb1; from f4738f56d1dc62aaba69b33702a5ab098f1b8c63 before 02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b; from f4738f56d1dc62aaba69b33702a5ab098f1b8c63 before c3fd16c3b98ed726294feab2f94f876290bf7b61 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; 7.0; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0patch
- https://git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1patch
- https://git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89bpatch
- https://git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61patch
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.