CVE-2026-31758Public exploit

Kernel memory corruption via unflushed anchored URBs

Published May 1, 2026 · Updated May 1, 2026

Use-after-free in Linux Kernel 4.19 and later allows local users to corrupt kernel memory by closing a USBTMC file with pending URBs. usbtmc_release frees per-file state without first calling usbtmc_draw_down, so an anchored URB can complete through the HCD giveback path and access that released state. A local low-privilege user needs access to a USBTMC device; the public reproducer demonstrates a kernel memory write and crash, but not code execution.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel 4.19 and later allows local users to corrupt kernel memory by closing a USBTMC file with pending URBs. usbtmc_release frees per-file state without first calling usbtmc_draw_down, so an anchored URB can complete through the HCD giveback path and access that released state. A local low-privilege user needs access to a USBTMC device; the public reproducer demonstrates a kernel memory write and crash, but not code execution.

The record

CVE
CVE-2026-31758
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19
  2. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f
  3. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <8a768552f7a8276fb9e01d49773d2094ace7c8f1
  4. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <959ef329071136e4335b54822fe2f607659b4569
  5. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <95e09b07e50290254b28b8395509473104518f8c
  6. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <977b632db51d231dec0bc571089a5c2402674139
  7. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1
  8. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <d40198de50232e04c14c6e2092e896766c95ea48
  9. Affected versionversion=4f3c8d6eddc272b386464524235440a418ed2029 <e189d443767f7cd390c52f2e122e1fc41c7562d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.19; version=4f3c8d6eddc272b386464524235440a418ed2029 <7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f; version=4f3c8d6eddc272b386464524235440a418ed2029 <8a768552f7a8276fb9e01d49773d2094ace7c8f1; version=4f3c8d6eddc272b386464524235440a418ed2029 <959ef329071136e4335b54822fe2f607659b4569; version=4f3c8d6eddc272b386464524235440a418ed2029 <95e09b07e50290254b28b8395509473104518f8c; version=4f3c8d6eddc272b386464524235440a418ed2029 <977b632db51d231dec0bc571089a5c2402674139; version=4f3c8d6eddc272b386464524235440a418ed2029 <d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1; version=4f3c8d6eddc272b386464524235440a418ed2029 <d40198de50232e04c14c6e2092e896766c95ea48; version=4f3c8d6eddc272b386464524235440a418ed2029 <e189d443767f7cd390c52f2e122e1fc41c7562d6

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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