CVE-2024-47727

Local MMIO read and write via exception misclassification

Published Oct 21, 2024 · Updated Aug 5, 2026

Improper access control in Linux allows local users in TDX guests to read and write MMIO through crafted syscall pointers. The handle_mmio() path mistakes a userspace-triggered #VE for kernel-initiated MMIO and decodes the instruction without first confirming that its target address is in kernel space. An ordinary unprivileged guest process needs an exposed MMIO or shared mapping; successful exploitation can disclose data, alter device state, or panic the guest, but the published assessment identifies no guest-to-host escape.

CVSS severity7.8
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

Improper access control in Linux allows local users in TDX guests to read and write MMIO through crafted syscall pointers. The handle_mmio() path mistakes a userspace-triggered #VE for kernel-initiated MMIO and decodes the instruction without first confirming that its target address is in kernel space. An ordinary unprivileged guest process needs an exposed MMIO or shared mapping; successful exploitation can disclose data, alter device state, or panic the guest, but the published assessment identifies no guest-to-host escape.

The record

CVE
CVE-2024-47727
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 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

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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 <18ecd5b74682839e7cdafb7cd1ec106df7baa18c
  2. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <25703a3c980e21548774eea8c8a87a75c5c8f58c
  3. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee
  4. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <bca2e29f7e26ce7c3522f8b324c0bd85612f68e3
  5. Affected versionversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <d4fc4d01471528da8a9797a065982e05090e1d81
  6. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=31d58c4e557d46fa7f8557714250fb6f89c941ae <18ecd5b74682839e7cdafb7cd1ec106df7baa18c; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <25703a3c980e21548774eea8c8a87a75c5c8f58c; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <bca2e29f7e26ce7c3522f8b324c0bd85612f68e3; version=31d58c4e557d46fa7f8557714250fb6f89c941ae <d4fc4d01471528da8a9797a065982e05090e1d81; version=5.19

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
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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