Xen Linux Kernel Event Channel deadlock

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Xen. Impacted is an unknown function of the component Linux Kernel Event Channel Handler. The manipulation leads to deadlock. This vulnerability is uniquely identified as CVE-2023-34324. Local access is required to approach this attack. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Xen (Virtualization Software) (affected version unknown). This issue affects an unknown functionality of the component Linux Kernel Event Channel Handler. The manipulation with an unknown input leads to a deadlock vulnerability. Using CWE to declare the problem leads to CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. Impacted is availability. The summary by CVE is:

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).

The weakness was disclosed 10/10/2023. The advisory is shared at seclists.org. The identification of this vulnerability is CVE-2023-34324 since 06/01/2023. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 271767 (Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2025-112 (ALASKERNEL-5.4-2025-112)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the databases at Tenable (271767) and EUVD (EUVD-2023-38405). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.1
VulDB Temp Score: 4.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.9
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Deadlock
CWE: CWE-833 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 271767
Nessus Name: Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2025-112 (ALASKERNEL-5.4-2025-112)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/01/2023 🔍
10/10/2023 +131 days 🔍
10/10/2023 +0 days 🔍
10/29/2025 +750 days 🔍

Sourcesinfo

Advisory: seclists.org
Status: Confirmed

CVE: CVE-2023-34324 (🔍)
GCVE (CVE): GCVE-0-2023-34324
GCVE (VulDB): GCVE-100-241697
EUVD: 🔍

Entryinfo

Created: 10/10/2023 16:10
Updated: 10/29/2025 04:25
Changes: 10/10/2023 16:10 (37), 06/06/2025 01:42 (16), 06/06/2025 04:48 (12), 10/29/2025 04:25 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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