CVE-2026-31757
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USB URB Memory Leak in Linux Kernel

Publication date: 2026-05-01

Last updated on: 2026-05-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: usb: misc: usbio: Fix URB memory leak on submit failure When usb_submit_urb() fails in usbio_probe(), the previously allocated URB is never freed, causing a memory leak. Fix this by jumping to err_free_urb label to properly release the URB on the error path.
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Meta Information
Published
2026-05-01
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-31757
EUVD
EUVD-2026-26570
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
linux linux_kernel From 6.18 (inc) to 6.18.22 (exc)
Helpful Resources
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 exists in the Linux kernel's USB subsystem, specifically in the usbio component. When the function usb_submit_urb() fails during the usbio_probe() process, the allocated USB Request Block (URB) is not freed properly, leading to a memory leak. The issue is fixed by ensuring that on failure, the code jumps to an error handling label that releases the allocated URB, preventing the memory leak.

Impact Analysis

This vulnerability can cause a memory leak in the Linux kernel when USB devices are initialized and the usb_submit_urb() function fails. Over time, this memory leak could lead to increased memory usage, potentially degrading system performance or causing instability. In environments with frequent USB device connections or disconnections, this could result in resource exhaustion or system crashes.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version that includes the fix for the usbio URB memory leak issue.

The fix ensures that when usb_submit_urb() fails in usbio_probe(), the allocated URB is properly freed, preventing memory leaks.

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