CVE-2024-44948 Affecting kernel-uek-debug-devel package, versions <0:4.14.35-2047.543.3.el7uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-ORACLE7-KERNELUEKDEBUGDEVEL-8185921
  • published15 Oct 2024
  • disclosed4 Sept 2024

Introduced: 4 Sep 2024

CVE-2024-44948  (opens in a new tab)

How to fix?

Upgrade Oracle:7 kernel-uek-debug-devel to version 0:4.14.35-2047.543.3.el7uek or higher.
This issue was patched in ELSA-2024-12868.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-debug-devel package and not the kernel-uek-debug-devel package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

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 Scores

version 3.1