CVE-2026-31470

Kernel memory disclosure via unchecked quote length

Published Apr 22, 2026 · Updated Apr 22, 2026

Out-of-bounds read in the Linux kernel TDX guest driver allows attackers to expose guest kernel memory through attestation quotes. The driver trusts host-controlled quote_buf->out_len while copying a quote to guest userspace, so an oversized or raced value reads beyond allocated quote pages. Exploitation requires a TDX guest requesting remote-attestation quotes from a malicious host; leaked data can cross container boundaries or reach an attestation server.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel TDX guest driver allows attackers to expose guest kernel memory through attestation quotes. The driver trusts host-controlled quote_buf->out_len while copying a quote to guest userspace, so an oversized or raced value reads beyond allocated quote pages. Exploitation requires a TDX guest requesting remote-attestation quotes from a malicious host; leaked data can cross container boundaries or reach an attestation server.

The record

CVE
CVE-2026-31470
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.7
  2. Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b
  3. Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <6f3c8795ae9ba74fa10fe979293d1904712d3fb1
  4. Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <a079a62883e3365de592cea9f7a669d8115433b0
  5. Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <c3fd16c3b98ed726294feab2f94f876290bf7b61

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.7; version=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b; version=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <6f3c8795ae9ba74fa10fe979293d1904712d3fb1; version=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <a079a62883e3365de592cea9f7a669d8115433b0; version=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <c3fd16c3b98ed726294feab2f94f876290bf7b61

Published CVSS scores

7.1Linux kernelCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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