Information Exposure Affecting kernel-rt-kvm package, versions <0:5.14.0-362.8.1.el9_3


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.69% (70th percentile)

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  • Snyk IDSNYK-RHEL9-KERNELRTKVM-5773648
  • published13 Jul 2023
  • disclosed23 Jun 2023

Introduced: 23 Jun 2023

CVE-2023-3640  (opens in a new tab)
CWE-200  (opens in a new tab)
CWE-203  (opens in a new tab)

How to fix?

Upgrade RHEL:9 kernel-rt-kvm to version 0:5.14.0-362.8.1.el9_3 or higher.
This issue was patched in RHSA-2023:6583.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the 'Randomize per-cpu entry area' feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.

CVSS Base Scores

version 3.1