CVE-2026-31470High· 7.1▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= f4738f56d1dc62aaba69b33702a5ab098f1b8c63 < a079a62883e3365de592cea9f7a669d8115433b0Linux >= f4738f56d1dc62aaba69b33702a5ab098f1b8c63 < 6f3c8795ae9ba74fa10fe979293d1904712d3fb1Linux >= f4738f56d1dc62aaba69b33702a5ab098f1b8c63 < 02ca2d9d197723696cb9cc0cb159eb7e8bf5f89bLinux >= f4738f56d1dc62aaba69b33702a5ab098f1b8c63 < c3fd16c3b98ed726294feab2f94f876290bf7b61Linux 6.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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