Critical Denial of Service Vulnerability in isns-utils Package
Summary
ALSA-2026:53847: Important: isns-utils security update. Affects isns-utils versions < 0.101-4.el9_8.1. Fixed in 0.101-4.el9_8.1. How to fix ↓
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Background
The isns-utils package provides tools and a daemon for setting up an Internet Storage Name Service (iSNS) server, which facilitates the automated discovery, management, and configuration of iSCSI and Fibre Channel devices over a TCP/IP network. This package is essential for environments utilizing storage area networks, enabling efficient communication and management of storage resources. However, it is susceptible to vulnerabilities that can compromise its functionality and security.
Vulnerability Detail
The vulnerability identified as CVE-2026-55995 is a Denial of Service (DoS) issue caused by a double-free error in the iSNS attribute decoder of the open-isns component. This flaw can be exploited by an attacker to crash the iSNS service, leading to service interruptions and potential data unavailability. The vulnerability arises from improper memory management, which can be exploited under specific conditions, allowing attackers to manipulate the service's behavior.
How To Fix
Minimum fixed version
0.101-4.el9_8.1
This is the first release that contains the fix.
sudo dnf update isns-utilsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if updating the package is not immediately possible, consider disabling the iSNS service until the patch can be applied. This can be done by executing the command:
sudo systemctl stop isnsd' and 'sudo systemctl disable isnsd
However, this may impact the functionality of iSCSI and Fibre Channel devices relying on iSNS.
Conclusion
The isns-utils package has a critical vulnerability (CVE-2026-55995) that can lead to Denial of Service attacks. It is crucial for users to update their packages to the latest version to protect their systems. Temporary workarounds are available, but they may affect system functionality. Regular monitoring and updates are essential for maintaining security.
See every vulnerability recorded for isns-utils →
FAQ
CVE-2026-55995 is a Denial of Service vulnerability in the isns-utils package that can cause the iSNS service to crash due to a double-free error.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to service interruptions, making iSCSI and Fibre Channel devices unavailable, which can severely impact storage operations.
Yes, a patch is available. Users should update to version 0.101-4.el9_8.1 of the isns-utils and isns-utils-libs packages.
If an immediate update is not possible, consider disabling the iSNS service temporarily to mitigate the risk of exploitation.
Related vulnerabilities
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