Critical Use-After-Free Vulnerability in Linux Kernel Affecting Debian Packages
Summary
CVE-2023-53111: In the Linux kernel, the following vulnerability has been resolved: loop: Fix use-after-free issues do_req_filebacked() calls blk_mq_complete_request() synchronously or asynchronously when using asynchronous I/O unless m... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. 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 the Linux operating system, managing hardware resources and providing essential services for software applications. It is widely used in various distributions, including Debian. This vulnerability specifically affects the loop device, which allows files to be treated as block devices. The issue arises from improper handling of memory requests, leading to potential system crashes.
Vulnerability Detail
The vulnerability, identified as CVE-2023-53111, is a use-after-free issue in the Linux kernel's loop device implementation. It occurs when the function do_req_filebacked() completes a request, but the subsequent code in loop_handle_cmd() still attempts to dereference pointers 'cmd' and 'rq'. This can lead to a kernel NULL pointer dereference, causing a system crash. The vulnerability can be exploited if an attacker can trigger the loop device functionality, potentially leading to denial of service or system instability.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. 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 to mitigate risks.
Conclusion
The CVE-2023-53111 vulnerability poses a significant risk to systems running affected versions of the Linux kernel in Debian distributions. It is crucial to apply the available patch to ensure system stability and security. Regular monitoring for vulnerabilities using tools like Vulert can help maintain a secure environment.
See every vulnerability recorded for linux →
FAQ
CVE-2023-53111 is a critical use-after-free vulnerability in the Linux kernel that can lead to system crashes.
Debian 11, 12, and 13 are affected by this vulnerability.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
The vulnerability can lead to kernel crashes, resulting in denial of service and system instability.
Yes, a patch is available in version 6.1.25-1 for Debian 12 and 13. It is recommended to update your system to this version.
Related vulnerabilities
Recent vulnerabilities recorded for linux.
