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Fencer Vulns
high 7.8

CVE-2024-47727 json

x86/tdx: Fix "in-kernel MMIO" check

published 2024-10-21 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-42646

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

x86/tdx: Fix "in-kernel MMIO" check

TDX only supports kernel-initiated MMIO operations. The handle_mmio() function checks if the #VE exception occurred in the kernel and rejects the operation if it did not.

However, userspace can deceive the kernel into performing MMIO on its behalf. For example, if userspace can point a syscall to an MMIO address, syscall does get_user() or put_user() on it, triggering MMIO #VE. The kernel will treat the #VE as in-kernel MMIO.

Ensure that the target MMIO address is within the kernel before decoding instruction.

Patch / fix

  • Linux Linux 6.1.113, 6.6.54, 6.10.13, 6.11.2, 6.12
  • linux Debian 12 6.1.115-1
  • linux Debian 14, Debian 13 6.11.2-1

debian advisories DEBIAN-CVE-2024-47727

  • linux Ubuntu 24.04 LTS 6.8.0-54.56
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1023.25
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1024.26
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1019.23
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1022.22
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1025.30
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1006.8
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1019.23

ubuntu advisories UBUNTU-CVE-2024-47727

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-611.5.1.el9_7
  • rv RHEL 9 5.14.0-611.5.1.el9_7
  • perf RHEL 9 5.14.0-611.5.1.el9_7
  • rtla RHEL 9 5.14.0-611.5.1.el9_7
  • libperf RHEL 9 5.14.0-611.5.1.el9_7
  • kernel-rt RHEL 9 5.14.0-611.5.1.el9_7
  • kernel-64k RHEL 9 5.14.0-611.5.1.el9_7
  • kernel-core RHEL 9 5.14.0-611.5.1.el9_7

red hat advisories RHSA-2026:4246RHSA-2026:4011RHSA-2025:20518

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1.21.4
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.2
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20164-1SUSE-SU-2025:20247-1SUSE-SU-2025:20163-1SUSE-SU-2025:20246-1SUSE-SU-2024:4387-1SUSE-SU-2024:4364-1

  • kernel-source-longterm openSUSE Tumbleweed 6.12.11-1.1
  • kernel-source openSUSE Tumbleweed 6.11.8-1.1

opensuse advisories openSUSE-SU-2025:14705-1openSUSE-SU-2024:14500-1

  • kernel AlmaLinux 9 5.14.0-611.5.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.5.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.5.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.5.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.5.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.5.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.5.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.5.1.el9_7

almalinux advisories ALSA-2025:20518

  • kernel Rocky Linux 9 5.14.0-611.5.1.el9_7

rocky linux advisories RLSA-2025:20518

  • kernel Azure Linux 3.0 6.6.56.1-5

azure linux advisories AZL-50879

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-47727 updated cvss 7.8

kernel: x86/tdx: Fix "in-kernel MMIO" check

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.114.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.114.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.114.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.114.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.114.1.el9_4
    fixed: vendor fix RHSA-2026:4246
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.96.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.96.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.96.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.96.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.96.1.el9_6
    fixed: vendor fix RHSA-2026:4011
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.5.1.el9_7, perf 5.14.0-611.5.1.el9_7, rtla 5.14.0-611.5.1.el9_7, python3-perf 5.14.0-611.5.1.el9_7, kernel-devel-matched 5.14.0-611.5.1.el9_7, kernel-64k-devel-matched 5.14.0-611.5.1.el9_7, +7 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.114.1.el9_4, perf 5.14.0-427.114.1.el9_4, rtla 5.14.0-427.114.1.el9_4, kernel-devel-matched 5.14.0-427.114.1.el9_4, kernel-64k-devel-matched 5.14.0-427.114.1.el9_4, kernel-debug-devel-matched 5.14.0-427.114.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:4246
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.96.1.el9_6, perf 5.14.0-570.96.1.el9_6, rtla 5.14.0-570.96.1.el9_6, python3-perf 5.14.0-570.96.1.el9_6, kernel-devel-matched 5.14.0-570.96.1.el9_6, kernel-64k-devel-matched 5.14.0-570.96.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:4011
show 9 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.5.1.el9_7, kernel-64k 5.14.0-611.5.1.el9_7, kernel-core 5.14.0-611.5.1.el9_7, kernel-tools 5.14.0-611.5.1.el9_7, kernel-modules 5.14.0-611.5.1.el9_7, kernel-64k-core 5.14.0-611.5.1.el9_7, +27 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.114.1.el9_4, kernel 5.14.0-427.114.1.el9_4, kernel-64k 5.14.0-427.114.1.el9_4, kernel-core 5.14.0-427.114.1.el9_4, kernel-tools 5.14.0-427.114.1.el9_4, python3-perf 5.14.0-427.114.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:4246
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.96.1.el9_6, kernel-64k 5.14.0-570.96.1.el9_6, kernel-core 5.14.0-570.96.1.el9_6, kernel-tools 5.14.0-570.96.1.el9_6, kernel-modules 5.14.0-570.96.1.el9_6, kernel-64k-core 5.14.0-570.96.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:4011
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.5.1.el9_7 Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.5.1.el9_7, kernel-rt-64k 5.14.0-611.5.1.el9_7, kernel-rt-core 5.14.0-611.5.1.el9_7, kernel-rt-modules 5.14.0-611.5.1.el9_7, kernel-rt-64k-core 5.14.0-611.5.1.el9_7, kernel-rt-debug-core 5.14.0-611.5.1.el9_7, +14 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.114.1.el9_4, kernel-rt-core 5.14.0-427.114.1.el9_4, kernel-rt-modules 5.14.0-427.114.1.el9_4, kernel-rt-debug-core 5.14.0-427.114.1.el9_4, kernel-rt-modules-core 5.14.0-427.114.1.el9_4, kernel-rt-debug-modules 5.14.0-427.114.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:4246
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.96.1.el9_6, kernel-rt-64k 5.14.0-570.96.1.el9_6, kernel-rt-core 5.14.0-570.96.1.el9_6, kernel-rt-modules 5.14.0-570.96.1.el9_6, kernel-rt-64k-core 5.14.0-570.96.1.el9_6, kernel-rt-debug-core 5.14.0-570.96.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:4011
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.5.1.el9_7, kernel-rt-core 5.14.0-611.5.1.el9_7, kernel-rt-modules 5.14.0-611.5.1.el9_7, kernel-rt-debug-core 5.14.0-611.5.1.el9_7, kernel-rt-modules-core 5.14.0-611.5.1.el9_7, kernel-rt-debug-modules 5.14.0-611.5.1.el9_7, +4 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.114.1.el9_4, kernel-rt-kvm 5.14.0-427.114.1.el9_4, kernel-rt-core 5.14.0-427.114.1.el9_4, kernel-rt-modules 5.14.0-427.114.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.114.1.el9_4, kernel-rt-debug-core 5.14.0-427.114.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:4246
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.96.1.el9_6, kernel-rt-kvm 5.14.0-570.96.1.el9_6, kernel-rt-core 5.14.0-570.96.1.el9_6, kernel-rt-modules 5.14.0-570.96.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.96.1.el9_6, kernel-rt-debug-core 5.14.0-570.96.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:4011

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.