CVE-2024-46794

Guest stack disclosure via populated TDVMCALL input

Published Sep 18, 2024 · Updated May 11, 2026

Information disclosure in the Linux x86 TDX MMIO path allows attackers controlling the VMM to read a guest kernel stack value. The mmio_read() function copies output-only *val into the outgoing TDVMCALL r15 input, transmitting its prior stack value to the VMM. Reachability requires an Intel TDX guest and an MMIO read; no integrity or service-interruption impact is reported.

CVSS severity3.3
Low
EPSS probability0.20%
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 the Linux x86 TDX MMIO path allows attackers controlling the VMM to read a guest kernel stack value. The mmio_read() function copies output-only *val into the outgoing TDVMCALL r15 input, transmitting its prior stack value to the VMM. Reachability requires an Intel TDX guest and an MMIO read; no integrity or service-interruption impact is reported.

The record

CVE
CVE-2024-46794
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=31d58c4e557d46fa7f8557714250fb6f89c941ae <26c6af49d26ffc377e392e30d4086db19eed0ef7
  2. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <b55ce742afcb8e8189d82f2f1e635ba1b5a461fa
  3. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <b6fb565a2d15277896583d471b21bc14a0c99661
  4. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <ef00818c50cf55a3a56bd9a9fae867c92dfb84e7
  5. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <26c6af49d26ffc377e392e30d4086db19eed0ef7; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <b55ce742afcb8e8189d82f2f1e635ba1b5a461fa; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <b6fb565a2d15277896583d471b21bc14a0c99661; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <ef00818c50cf55a3a56bd9a9fae867c92dfb84e7; version=5.19

Published CVSS scores

3.3CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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.

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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

T1005Data from Local System

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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