Use-After-Free Vulnerability in Linux Kernel Affecting Debian Packages
Summary
CVE-2025-39691: In the Linux kernel, the following vulnerability has been resolved: fs/buffer: fix use-after-free when call bh_read() helper There's issue as follows: BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110 Re... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing hardware resources and providing essential services to applications. This vulnerability affects multiple versions of the Linux package across various Debian releases (11, 12, 13, and 14), highlighting a critical flaw in the filesystem buffer management that could lead to severe system instability.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability has been identified in the buffer management system, specifically within the 'end_buffer_read_sync' function. This issue arises when a buffer head is freed while still in use, leading to potential stack overflows and undefined behavior. The vulnerability can be triggered during NTFS3 filesystem mounts, where improper handling of buffer states can result in memory corruption, crashes, or even arbitrary code execution.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid mounting NTFS3 filesystems until a patch is applied. This will help prevent triggering the vulnerability until the system is updated.
Conclusion
The use-after-free vulnerability in the Linux kernel poses significant risks to Debian users across multiple releases. It is crucial to update the Linux package to the latest version to mitigate these risks. Users can also utilize tools like Vulert to monitor their applications for vulnerabilities in real-time.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory resource after it has been freed, potentially leading to memory corruption and security issues.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can receive real-time alerts about vulnerabilities.
The risks include system crashes, data corruption, and potential exploitation by attackers to execute arbitrary code on the affected system.
Yes, updating to the latest patched version of the Linux package for your Debian release will resolve the vulnerability.
Yes, you can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring an account.
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