Integer Overflow Vulnerability in Linux Kernel (CVE-2025-21748)
Summary
CVE-2025-21748: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix integer overflows on 32 bit systems On 32bit systems the addition operations in ipc_msg_alloc() can potentially overflow leading to memory co... Affects linux versions < 6.1.129-1. Fixed in 6.1.129-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages system resources and provides essential services to software applications. The kernel is known for its stability and performance, but like any complex software, it can have vulnerabilities. This specific vulnerability affects the kernel's ksmbd module, which is responsible for SMB (Server Message Block) protocol support, enabling file and printer sharing between computers on a network.
Vulnerability Detail
In the Linux kernel, specifically in the ksmbd module, an integer overflow vulnerability exists on 32-bit systems. The issue arises in the ipc_msg_alloc() function, where addition operations can overflow, potentially leading to memory corruption. This vulnerability could allow an attacker to exploit the overflow, resulting in unexpected behavior, crashes, or even arbitrary code execution, compromising the integrity and security of the system.
How To Fix
Minimum fixed version
6.1.129-1
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 mentioned for this vulnerability. The best course of action is to apply the patch by updating the Linux package as described above.
Conclusion
The CVE-2025-21748 vulnerability in the Linux kernel poses a significant risk to 32-bit systems due to potential integer overflows. It is crucial for users to update their Linux packages to mitigate this risk and ensure system security. Regular monitoring and prompt updates are essential for maintaining a secure environment.
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FAQ
CVE-2025-21748 is a vulnerability in the Linux kernel's ksmbd module that can lead to integer overflows on 32-bit systems, potentially causing memory corruption.
If exploited, this vulnerability could allow attackers to corrupt memory, leading to system crashes or unauthorized access to sensitive data.
If you are using a 32-bit version of the Linux kernel, you may be affected. You can check your application for vulnerabilities using Vulert's playground at Vulert Scanner.
While there are no specific workarounds, it is advisable to monitor your system for unusual activity and apply the update as soon as possible.
Detailed information can be found in the official CVE database and security advisories related to the Linux kernel.
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