CVE-2024-44948

MEDIUM EPSS 15.0%
Published Sep 4, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 4, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
15.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥2.6.22  –  <4.19.320
linuxlinux_kernel*≥4.20  –  <5.4.282
linuxlinux_kernel*≥5.5  –  <5.10.224
linuxlinux_kernel*≥5.11  –  <5.15.165
linuxlinux_kernel*≥5.16  –  <6.1.105
linuxlinux_kernel*≥6.2  –  <6.6.46
linuxlinux_kernel*≥6.7  –  <6.10.5
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any

References 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • git.kernel.org https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

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