CVE-2024-44948
x86/mtrr: Check if fixed MTRRs exist before saving them
Description
In the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving them MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this.
INFO
Published Date :
Sept. 4, 2024, 7:15 p.m.
Last Modified :
Nov. 3, 2025, 11:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the affected Linux kernel packages.
- Reboot the system to apply the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-44948.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-44948 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-44948
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-44948 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-44948 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html Added Reference https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html -
Initial Analysis by [email protected]
Oct. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.165 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.224 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.282 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.5 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.46 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.22 up to (excluding) 4.19.320 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.105 *cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* Added Reference Type kernel.org: https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16 Types: Patch -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 04, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving them MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this. Added Reference kernel.org https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614 [No types assigned]