Oracle Linux: CVE-2024-44948: ELSA-2024-12782: Unbreakable Enterprise kernel-container security update (IMPORTANT) (Multiple Advisories)

Oracle Linux: CVE-2024-44948: ELSA-2024-12782: Unbreakable Enterprise kernel-container security update (IMPORTANT) (Multiple Advisories)

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

09/04/2024

Created

10/18/2024

Added

10/16/2024

Modified

01/23/2025

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.

Solution(s)

• oracle-linux-upgrade-kernel-uek

References

• https://attackerkb.com/topics/cve-2024-44948
• CVE - 2024-44948
• ELSA-2024-12782
• ELSA-2024-12780
• ELSA-2024-12815
• ELSA-2024-12868