Critical Vulnerability in Linux Kernel: Queue Mapping Mismanagement
Summary
DEBIAN-CVE-2026-98797: In the Linux kernel, the following vulnerability has been resolved: net: cap skb->queue_mapping when the tx queue is picked skbedit can set skb->queue_mapping and raise the per-CPU skip_txqueue flag so dev_queue_xmit() h... Affects linux versions 6.1.106-1 – 7.3~rc7-1~exp1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, managing hardware and system resources. It provides essential services for all other parts of the operating system, including process management, memory management, and device control. This vulnerability affects the kernel's networking stack, specifically how it handles packet transmission queues, potentially leading to severe security issues.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified where the skb->queue_mapping can be manipulated by the skbedit tool, allowing a local user in a network namespace to redirect packets from a device with more TX queues to one with fewer. This mismanagement can lead to out-of-bounds access in the taprio_enqueue function, causing system instability or crashes. The issue arises from the improper handling of the skip_txqueue flag during packet transmission, which can result in accessing invalid memory locations.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid using the skbedit tool for modifying skb->queue_mapping until the kernel is updated. Additionally, ensure that network namespaces are properly configured to limit the capabilities of local users.
Conclusion
The vulnerability in the Linux kernel regarding queue mapping mismanagement poses significant risks to system stability and security. Users are strongly advised to update their kernel to the latest patched versions to mitigate these risks. Temporary workarounds can be employed until the update is applied.
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FAQ
The vulnerability can lead to system crashes or instability due to out-of-bounds memory access, affecting the reliability of network operations.
Local users with CAP_NET_ADMIN privileges in a network namespace can exploit this vulnerability.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Yes, updating to the patched versions of the Linux kernel will resolve the vulnerability permanently.
If an immediate update is not possible, avoid using the skbedit tool and ensure proper configuration of network namespaces to limit exposure.
References
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