Critical Security Update for isns-utils: Denial of Service Vulnerability
Summary
ALSA-2026:53846: Important: isns-utils security update. Affects isns-utils versions < 0.103-1.el10_2.1. Fixed in 0.103-1.el10_2.1. How to fix ↓
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Background
The isns-utils package provides essential tools and a daemon for setting up an Internet Storage Name Service (iSNS) server and client tools. The iSNS protocol facilitates the automated discovery, management, and configuration of iSCSI and Fibre Channel devices over TCP/IP networks. As a critical component in storage networking, any vulnerabilities within this package can significantly impact system stability 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 if an attacker sends specially crafted requests to the iSNS server.
How To Fix
Minimum fixed version
0.103-1.el10_2.1
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 workaround, you can disable the iSNS service until the packages are updated. This can be done by running the following command:
sudo systemctl stop isnsd
This will halt the iSNS daemon, preventing any potential exploitation until a proper fix is applied.
Conclusion
In summary, the isns-utils package has a critical vulnerability (CVE-2026-55995) that can lead to Denial of Service. It is crucial to update the affected packages to the latest version to safeguard your systems. Temporary workarounds are available, but they should not replace a proper update.
See every vulnerability recorded for isns-utils →
FAQ
The impact includes potential Denial of Service, which can lead to service interruptions and unavailability of storage resources.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updates are not possible, consider stopping the iSNS service as a temporary workaround to mitigate risks.
While the primary risk is service disruption, it is advisable to ensure data backups are in place to prevent any potential data loss.
For detailed information, refer to the CVE page associated with CVE-2026-55995 and the advisory provided by AlmaLinux.
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