Memory Management Vulnerability in Linux Kernel: UAF in Memory Cgroup Handling
Summary
DEBIAN-CVE-2024-43888: In the Linux kernel, the following vulnerability has been resolved: mm: list_lru: fix UAF for memory cgroup The mem_cgroup_from_slab_obj() is supposed to be called under rcu lock or cgroup_mutex or others which could pre... Affects linux versions < 6.10.6-1. Fixed in 6.10.6-1. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux kernel is the core component of a Linux operating system, managing hardware resources and providing essential services for all other software. It is known for its stability, performance, and flexibility. However, like any complex software, it can be susceptible to vulnerabilities. This specific issue pertains to the memory management subsystem, particularly in how memory cgroups are handled, which can lead to potential security risks if not addressed.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the memory management subsystem related to the handling of memory cgroups. The issue arises from a use-after-free (UAF) condition in the function mem_cgroup_from_slab_obj(). This function is expected to operate under specific locking mechanisms (rcu lock or cgroup_mutex) to prevent the returned memory cgroup from being freed prematurely. The absence of the necessary rcu read lock can lead to undefined behavior, potentially allowing an attacker to exploit this flaw, resulting in system instability or unauthorized access to memory resources.
How To Fix
Minimum fixed version
6.10.6-1
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 as soon as it is available.
Conclusion
The identified vulnerability in the Linux kernel regarding memory cgroup handling poses significant risks if left unaddressed. It is crucial for users to update their systems to the patched version to ensure security and stability. Regular monitoring and prompt application of updates are essential practices for maintaining a secure environment.
See every vulnerability recorded for linux →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially leading to crashes or exploitation.
You can use Vulert, which monitors open-source vulnerabilities in your software. By simply uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without needing to access the code.
Exploiting this vulnerability could lead to system instability, unauthorized access to sensitive memory areas, or even remote code execution in severe cases.
While there are no specific workarounds available, it is advisable to limit access to the affected systems and monitor for any unusual activity until the patch is applied.
Detailed information about this vulnerability can be found in the Debian CVE database or through security advisories related to the Linux kernel.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux.
