CVE-2023-52874

TDX guest data disclosure via uncleared RSI

Published May 21, 2024 · Updated Aug 5, 2026

Information disclosure in Linux 6.4 through 6.5.11 and 6.6 through 6.6.1 allows attackers controlling the VMM to read TDX guest data. The x86 TDX_HYPERCALL assembly leaves VMM-supplied RSI uncleared after TDCALL, allowing speculative execution to consume the untrusted value. Exploitation requires control of the local untrusted VMM and is limited to confidentiality loss across the TDX guest boundary.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux 6.4 through 6.5.11 and 6.6 through 6.6.1 allows attackers controlling the VMM to read TDX guest data. The x86 TDX_HYPERCALL assembly leaves VMM-supplied RSI uncleared after TDCALL, allowing speculative execution to consume the untrusted value. Exploitation requires control of the local untrusted VMM and is limited to confidentiality loss across the TDX guest boundary.

The record

CVE
CVE-2023-52874
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.4
  2. Affected versionversion=7a3a401874bea02f568aa416ac29170d8cde0dc2 <2191950d35d8f81620ea8d4e04d983f664fe3a8a
  3. Affected versionversion=7a3a401874bea02f568aa416ac29170d8cde0dc2 <5d092b66119d774853cc9308522620299048a662
  4. Affected versionversion=7a3a401874bea02f568aa416ac29170d8cde0dc2 <de4c5bacca4f50233f1f791bec9eeb4dee1b14cd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=7a3a401874bea02f568aa416ac29170d8cde0dc2 <2191950d35d8f81620ea8d4e04d983f664fe3a8a; version=7a3a401874bea02f568aa416ac29170d8cde0dc2 <5d092b66119d774853cc9308522620299048a662; version=7a3a401874bea02f568aa416ac29170d8cde0dc2 <de4c5bacca4f50233f1f791bec9eeb4dee1b14cd

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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