CVE-2026-31470

HIGH EPSS 2.6%
Published Apr 22, 20262mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/02ca2d9d197723696cb9cc0cb159eb7e8bf5f89b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6f3c8795ae9ba74fa10fe979293d1904712d3fb1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a079a62883e3365de592cea9f7a669d8115433b0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3fd16c3b98ed726294feab2f94f876290bf7b61
    Patch