Improper Locking Affecting kernel-modules-extra package, versions <0:6.1.84-99.169.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELMODULESEXTRA-7643889
  • published7 Aug 2024
  • disclosed1 May 2024

Introduced: 1 May 2024

CVE-2024-26933  (opens in a new tab)
CWE-667  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-modules-extra to version 0:6.1.84-99.169.amzn2023 or higher.
This issue was patched in ALAS2023-2024-696.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-modules-extra package and not the kernel-modules-extra package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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

USB: core: Fix deadlock in port "disable" sysfs attribute

The show and store callback routines for the "disable" sysfs attribute file in port.c acquire the device lock for the port's parent hub device. This can cause problems if another process has locked the hub to remove it or change its configuration:

Removing the hub or changing its configuration requires the
hub interface to be removed, which requires the port device
to be removed, and device_del() waits until all outstanding
sysfs attribute callbacks for the ports have returned.  The
lock can&#39;t be released until then.

But the disable_show() or disable_store() routine can&#39;t return until after it has acquired the lock.

The resulting deadlock can be avoided by calling sysfs_break_active_protection(). This will cause the sysfs core not to wait for the attribute's callback routine to return, allowing the removal to proceed. The disadvantage is that after making this call, there is no guarantee that the hub structure won't be deallocated at any moment. To prevent this, we have to acquire a reference to it first by calling hub_get().

CVSS Scores

version 3.1