Linux Kernel: Deadlock on Event Channel Close via Xen Console
CVE-2023-34324 Published on January 5, 2024

Possible deadlock in Linux kernel event handling
Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt in an unprivileged guest. The closing of an event channel is e.g. triggered by removal of a paravirtual device on the other side. As this action will cause console messages to be issued on the other side quite often, the chance of triggering the deadlock is not neglectable. Note that 32-bit Arm-guests are not affected, as the 32-bit Linux kernel on Arm doesn't use queued-RW-locks, which are required to trigger the issue (on Arm32 a waiting writer doesn't block further readers to get the lock).

NVD

Vulnerability Analysis

CVE-2023-34324 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
HIGH
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a Resource Exhaustion Vulnerability?

The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

CVE-2023-34324 has been classified to as a Resource Exhaustion vulnerability or weakness.


Products Associated with CVE-2023-34324

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-34324 are published in these products:

Canonical Ubuntu Linux
 
Citrix Xen Xen
 
Linux Kernel
 

Affected Versions

Linux Version consult Xen advisory XSA-441 is unknown by CVE-2023-34324

Exploit Probability

EPSS
0.07%
Percentile
20.77%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.