Critical Bluetooth Vulnerability in Linux Packages: Null Pointer Dereference Risk
Summary
CVE-2025-21937: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Add check for mgmt_alloc_skb() in mgmt_remote_name() Add check for the return value of mgmt_alloc_skb() in mgmt_remote_name() to prevent null... Affects linux versions < 6.1.133-1. Fixed in 6.1.133-1. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, including Debian. It manages hardware resources and provides essential services for software applications. This vulnerability affects the Bluetooth subsystem, which is responsible for wireless communication between devices. The specific issue arises from a lack of proper error handling in the mgmt_remote_name() function, potentially leading to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability was identified in the Bluetooth management functions. Specifically, the mgmt_remote_name() function did not adequately check the return value of mgmt_alloc_skb(), which could lead to a null pointer dereference. This flaw could allow an attacker to exploit the system, causing crashes or unexpected behavior, thereby compromising the integrity and availability of the system.
How To Fix
Minimum fixed version
6.1.133-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. It is recommended to apply the patch as soon as it becomes available for Debian 12.
Conclusion
The CVE-2025-21937 vulnerability in the Linux kernel poses a significant risk due to its potential for causing system instability through null pointer dereference. Users are advised to update their systems promptly to mitigate this risk. Monitoring tools like Vulert can help track vulnerabilities in your software without requiring code access.
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FAQ
CVE-2025-21937 is a vulnerability in the Linux kernel's Bluetooth subsystem that can lead to a null pointer dereference.
This vulnerability can cause system crashes or unexpected behavior, potentially allowing attackers to exploit the system.
Debian 12 is affected but does not yet have a fixed version. Debian 13 is affected but has a patched version available.
You can protect your system by updating to the latest patched version of the Linux package as soon as it is available.
More information can be found on the official CVE database or through security advisories from the Debian project.
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