Use-After-Free Vulnerability in Linux Kernel - Debian Packages
Summary
DEBIAN-CVE-2024-53177: In the Linux kernel, the following vulnerability has been resolved: smb: prevent use-after-free due to open_cached_dir error paths If open_cached_dir() encounters an error parsing the lease from the server, the error han... Affects linux versions < 6.12.3-1. Fixed in 6.12.3-1. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential services such as process management, memory management, and device control. The kernel is critical for system stability and security, making it imperative to address vulnerabilities that may compromise its integrity.
Vulnerability Detail
A use-after-free vulnerability has been identified in the Linux kernel's SMB (Server Message Block) implementation. This issue arises when the function open_cached_dir() encounters an error while parsing a lease from the server. The error handling can race with receiving a lease break, leading to the freeing of a cached file identifier (cfid) while queued work is still pending. This flaw can result in memory corruption and potential system crashes, posing a significant risk to system stability and security.
How To Fix
Minimum fixed version
6.12.3-1
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. It is recommended to apply the patch as soon as it becomes available.
Conclusion
The identified use-after-free vulnerability in the Linux kernel poses a significant risk to Debian systems. Users are urged to update their packages to the fixed version 6.12.3-1 to mitigate potential security threats. Regular updates and monitoring for vulnerabilities are essential for maintaining system integrity.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially leading to memory corruption and security issues.
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The risks include potential system crashes, memory corruption, and exploitation by malicious actors, which can compromise system security.
Yes, the vulnerability affects the Linux kernel versions prior to 6.12.3-1 in Debian 13 and 14.
It is recommended to regularly check for updates and apply patches as soon as they are released to ensure system security.
References
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