CVE-2026-31758
Analyzed Analyzed - Analysis Complete
USBTMCRC Use-After-Free 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: usbtmc: Flush anchored URBs in usbtmc_release When calling usbtmc_release, pending anchored URBs must be flushed or killed to prevent use-after-free errors (e.g. in the HCD giveback path). Call usbtmc_draw_down() to allow anchored URBs to be completed.
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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
2026-06-14
NVD
CVE-2026-31758
EUVD
EUVD-2026-26571
Affected Vendors & Products
Showing 13 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 5.11 (inc) to 5.15.203 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.22 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.168 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.81 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.134 (exc)
linux linux_kernel From 4.19 (inc) to 5.10.253 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability exists in the Linux kernel's USB Test and Measurement Class (usbtmc) driver. It occurs because when the function usbtmc_release is called, any pending anchored USB Request Blocks (URBs) are not properly flushed or killed. This can lead to use-after-free errors, particularly in the Host Controller Driver (HCD) giveback path. The fix involves calling usbtmc_draw_down() to ensure that all anchored URBs are completed and properly handled before release.

Impact Analysis

The vulnerability can lead to use-after-free errors in the Linux kernel's USB subsystem. Such errors may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges if they can exploit the improper handling of USB requests.

Mitigation Strategies

To mitigate this vulnerability, ensure that your Linux kernel is updated to a version where the issue in the usbtmc driver has been resolved.

Specifically, the fix involves flushing or killing pending anchored URBs in the usbtmc_release function to prevent use-after-free errors.

Applying the latest kernel patches or upgrading to a kernel version released after 2026-05-01 will address this issue.

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