Memory Corruption Vulnerability in Linux Kernel: CVE-2025-39849
Summary
CVE-2025-39849: In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() If the ssid->datalen is more than IEEE80211_MAX_SSID_LEN (32) it would lead to memor... Affects linux versions 6.1.106-1 – 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 Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is widely used across various platforms, including servers, desktops, and embedded systems. This vulnerability specifically affects the cfg80211 subsystem, which handles wireless networking in the kernel. The issue arises from improper handling of SSID lengths, leading to potential memory corruption.
Vulnerability Detail
In the Linux kernel, a vulnerability identified as CVE-2025-39849 has been discovered in the cfg80211 subsystem. This vulnerability occurs when the SSID length exceeds the maximum allowed value defined by IEEE80211_MAX_SSID_LEN (32 bytes). If an attacker can manipulate the SSID length, it may lead to memory corruption, potentially allowing for arbitrary code execution or system crashes. The vulnerability has been resolved by implementing bounds checking in the __cfg80211_connect_result() function.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch as soon as it becomes available.
Conclusion
CVE-2025-39849 is a critical vulnerability in the Linux kernel that requires immediate attention. Users are advised to update their systems to the patched version to mitigate potential risks. Regular monitoring and updates are essential to maintain system security.
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FAQ
CVE-2025-39849 is a vulnerability in the Linux kernel's cfg80211 subsystem that can lead to memory corruption due to improper handling of SSID lengths.
If exploited, this vulnerability could allow an attacker to execute arbitrary code or crash the system, compromising its integrity and security.
The vulnerability affects multiple versions of the Linux kernel across Debian 12, 13, and 14, with specific fixes available for Debian 14.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
While there are no specific workarounds, it is crucial to monitor your system for any suspicious activity and apply the update as soon as possible.
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