CVE-2026-23063
Awaiting Analysis Awaiting Analysis - Queue
BaseFortify

Publication date: 2026-02-04

Last updated on: 2026-03-13

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: uacce: ensure safe queue release with state management Directly calling `put_queue` carries risks since it cannot guarantee that resources of `uacce_queue` have been fully released beforehand. So adding a `stop_queue` operation for the UACCE_CMD_PUT_Q command and leaving the `put_queue` operation to the final resource release ensures safety. Queue states are defined as follows: - UACCE_Q_ZOMBIE: Initial state - UACCE_Q_INIT: After opening `uacce` - UACCE_Q_STARTED: After `start` is issued via `ioctl` When executing `poweroff -f` in virt while accelerator are still working, `uacce_fops_release` and `uacce_remove` may execute concurrently. This can cause `uacce_put_queue` within `uacce_fops_release` to access a NULL `ops` pointer. Therefore, add state checks to prevent accessing freed pointers.
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Meta Information
Published
2026-02-04
Last Modified
2026-03-13
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23063
Affected Vendors & Products
Showing 12 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.11 (inc) to 5.15.199 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.162 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.122 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.68 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.8 (exc)
linux linux_kernel 6.19
linux linux_kernel From 5.7 (inc) to 5.10.249 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability exists in the Linux kernel's uacce subsystem related to queue management. The issue arises because directly calling the function put_queue is unsafe as it cannot guarantee that the resources associated with uacce_queue have been fully released. This can lead to accessing freed or NULL pointers.

To fix this, a stop_queue operation was added for the UACCE_CMD_PUT_Q command to ensure proper state management before the final resource release by put_queue. The vulnerability involves improper handling of queue states, which can cause concurrent execution of release functions to access invalid pointers.

Impact Analysis

This vulnerability can lead to unsafe access of freed or NULL pointers during queue release operations in the Linux kernel's uacce subsystem. Specifically, when a forced poweroff is executed while accelerators are still working, concurrent operations may cause the system to access invalid memory.

Such unsafe memory access can result in system instability, crashes, or potential denial of service conditions, impacting the reliability and availability of systems using affected Linux kernel versions.

Compliance Impact

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