virt: tdx-guest: Fix handling of host controlled 'quote' buffer length
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.
CVE-2026-31470
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31470
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f4738f56d1dc62aaba69b33702a5ab098f1b8c63",
"lessThan": "a079a62883e3365de592cea9f7a669d8115433b0",
"versionType": "git"
},
{
"status": "affected",
"version": "f4738f56d1dc62aaba69b33702a5ab098f1b8c63",
"lessThan": "6f3c8795ae9ba74fa10fe979293d1904712d3fb1",
"versionType": "git"
},
{
"status": "affected",
"version": "f4738f56d1dc62aaba69b33702a5ab098f1b8c63",
"lessThan": "02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b",
"versionType": "git"
},
{
"status": "affected",
"version": "f4738f56d1dc62aaba69b33702a5ab098f1b8c63",
"lessThan": "c3fd16c3b98ed726294feab2f94f876290bf7b61",
"versionType": "git"
}
],
"programFiles": [
"drivers/virt/coco/tdx-guest/tdx-guest.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/virt/coco/tdx-guest/tdx-guest.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31470
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39887 · Revision 1
- Added to Heist Feed
- Publisher date