CVE-2026-31650

Local kernel memory corruption via vub300 lifetime error

Published Apr 24, 2026 · Updated Apr 24, 2026

Use-after-free in the Linux Kernel vub300 MMC host driver 6.17 allows local users to corrupt kernel memory during USB disconnect. The driver device-manages the controller allocation even though its final reference can be dropped after unbinding, allowing teardown to access freed memory. Exploitation requires low-privileged local access and an attached vub300 USB device; resulting kernel-memory corruption can expose or alter data or crash the host.

CVSS severity7.8
High
EPSS probability0.11%
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 the Linux Kernel vub300 MMC host driver 6.17 allows local users to corrupt kernel memory during USB disconnect. The driver device-manages the controller allocation even though its final reference can be dropped after unbinding, allowing teardown to access freed memory. Exploitation requires low-privileged local access and an attached vub300 USB device; resulting kernel-memory corruption can expose or alter data or crash the host.

The record

CVE
CVE-2026-31650
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.17
  2. Affected versionversion=dcfdd698dc521c6046e9b80c16281575efb25d23 <8f4d20a710225ec7a565f6a0459862d3b1f32330
  3. Affected versionversion=dcfdd698dc521c6046e9b80c16281575efb25d23 <ea7468f61be033f4e18b95f2912010ed1d175d75
  4. Affected versionversion=dcfdd698dc521c6046e9b80c16281575efb25d23 <ef0448c569b37ceabdd038e9faa311e5179127b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=dcfdd698dc521c6046e9b80c16281575efb25d23 <8f4d20a710225ec7a565f6a0459862d3b1f32330; version=dcfdd698dc521c6046e9b80c16281575efb25d23 <ea7468f61be033f4e18b95f2912010ed1d175d75; version=dcfdd698dc521c6046e9b80c16281575efb25d23 <ef0448c569b37ceabdd038e9faa311e5179127b0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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