CVE-2026-23061
Unknown Unknown - Not Provided
Memory Leak in Linux Kernel kvaser_usb USB Bulk Callback

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: can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak"). In kvaser_usb_set_{,data_}bittiming() -> kvaser_usb_setup_rx_urbs(), the URBs for USB-in transfers are allocated, added to the dev->rx_submitted anchor and submitted. In the complete callback kvaser_usb_read_bulk_callback(), the URBs are processed and resubmitted. In kvaser_usb_remove_interfaces() the URBs are freed by calling usb_kill_anchored_urbs(&dev->rx_submitted). However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in usb_kill_anchored_urbs(). Fix the memory leak by anchoring the URB in the kvaser_usb_read_bulk_callback() to the dev->rx_submitted anchor.
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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-2026-23061
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 3.8 (inc) to 5.10.249 (exc)
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
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-401 The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
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Executive Summary

This vulnerability is a memory leak in the Linux kernel's kvaser_usb driver. Specifically, the issue occurs in the function kvaser_usb_read_bulk_callback(), where USB Request Blocks (URBs) are processed and resubmitted. The problem arises because the USB framework unanchors the URB before the completion callback is called, causing the URB to no longer be anchored and thus not released properly. This leads to a memory leak as the URBs are not freed as intended.

The fix involves anchoring the URB again within the kvaser_usb_read_bulk_callback() function to ensure it is properly tracked and released later by usb_kill_anchored_urbs().

Impact Analysis

This memory leak vulnerability can cause increased memory usage in the system running the affected Linux kernel with the kvaser_usb driver. Over time, this could lead to resource exhaustion, degraded system performance, or even system instability or crashes if the leaked memory accumulates significantly.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

The vulnerability is a memory leak in the kvaser_usb driver in the Linux kernel related to URB handling. To mitigate this vulnerability, you should update your Linux kernel to a version that includes the fix for this issue.

The fix involves properly anchoring the URB in the kvaser_usb_read_bulk_callback() function to ensure that URBs are correctly released and do not leak memory.

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