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Review reviewHigh

CVE-2024-47727

Linux Linux, linux kernel

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...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.10.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 31d58c4e557d46fa7f8557714250fb6f89c941ae < 25703a3c980e21548774eea8c8a87a75c5c8f58c, >= 31d58c4e557d46fa7f8557714250fb6f89c941ae < 4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee, >= 31d58c4e557d46fa7f8557714250fb6f89c941ae < 18ecd5b74682839e7cdafb7cd1ec106df7baa18c, >= 31d58c4e557d46fa7f8557714250fb6f89c941ae < bca2e29f7e26ce7c3522f8b324c0bd85612f68e3, >= 31d58c4e557d46fa7f8557714250fb6f89c941ae < d4fc4d01471528da8a9797a065982e05090e1d81, >= 5.19, >= 5.19 < 6.1.113, >= 6.2 < 6.6.54, >= 6.7 < 6.10.13, >= 6.11 < 6.11.2
Fixed versions
6.1.113, 6.6.54, 6.10.13, 6.11.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-754
CVE-2024-47727 — Linux Linux, linux kernel | SECUFOCUS NOW