virt: tdx-guest: Fix handling of host controlled 'quote' buffer length

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Summary

CVECVE-2026-31470
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:43 UTC
Updated2026-04-22 14:16:43 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f4738f56d1dc62aaba69b33702a5ab098f1b8c63 a079a62883e3365de592cea9f7a669d8115433b0 git Not specified
CNA Linux Linux affected f4738f56d1dc62aaba69b33702a5ab098f1b8c63 6f3c8795ae9ba74fa10fe979293d1904712d3fb1 git Not specified
CNA Linux Linux affected f4738f56d1dc62aaba69b33702a5ab098f1b8c63 02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b git Not specified
CNA Linux Linux affected f4738f56d1dc62aaba69b33702a5ab098f1b8c63 c3fd16c3b98ed726294feab2f94f876290bf7b61 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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