Resource Leak Affecting kernel package, versions <0:4.18.0-477.74.1.el8_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-RHEL8-KERNEL-8086802
  • published24 Sept 2024
  • disclosed21 May 2024

Introduced: 21 May 2024

CVE-2023-52864  (opens in a new tab)
CWE-402  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel to version 0:4.18.0-477.74.1.el8_8 or higher.
This issue was patched in RHSA-2024:6993.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: wmi: Fix opening of char device

Since commit fa1f68db6ca7 ("drivers: misc: pass miscdevice pointer via file private data"), the miscdevice stores a pointer to itself inside filp->private_data, which means that private_data will not be NULL when wmi_char_open() is called. This might cause memory corruption should wmi_char_open() be unable to find its driver, something which can happen when the associated WMI device is deleted in wmi_free_devices().

Fix the problem by using the miscdevice pointer to retrieve the WMI device data associated with a char device using container_of(). This also avoids wmi_char_open() picking a wrong WMI device bound to a driver with the same name as the original driver.

CVSS Scores

version 3.1