0.0
NA
CVE-2024-44948
Linux Kernel x86 MTRR Capability Bypass Vulnerability
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 :

Sept. 5, 2024, 12:53 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

Exploitability Score :

Affected Products

The following products are affected by CVE-2024-44948 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
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.

URL Resource
https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9
https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e
https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6
https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051
https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462
https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7
https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614
https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16

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.

  • 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]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
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.

NONE - Vulnerability Scoring System
: