CVE-2026-63905

Kernel memory corruption via pending VUDC timer

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux Kernel USB/IP VUDC allows local users to corrupt kernel memory during virtual-device unbinding. vudc_remove frees struct vudc without synchronously deleting its embedded timer, allowing the timer core to write through freed storage. Reachability requires configured USB/IP VUDC support and local control of usbip_sockfd plus driver unbind and rebind operations.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux Kernel USB/IP VUDC allows local users to corrupt kernel memory during virtual-device unbinding. vudc_remove frees struct vudc without synchronously deleting its embedded timer, allowing the timer core to write through freed storage. Reachability requires configured USB/IP VUDC support and local control of usbip_sockfd plus driver unbind and rebind operations.

The record

CVE
CVE-2026-63905
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=4.7
  2. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <1036ac6148995feaf486014d32bf26bf993c06a9
  3. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <207bf80362df3fce8ebc9723351dcb1bc6d9ed0f
  4. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <61704e5cf9cd7464b510eb606e7e2978b1160a64
  5. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <88d459e5b5a46da1ef9fd6f52d9439343edeec88
  6. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <a0638db2340ee053ab0450656a763fd111475e54
  7. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <d07ed707467ce05ea9c03412d0c5ee9d0fe386a6
  8. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <d96209626a29ea64666be98c30b30ac82e5f1be6
  9. Affected versionversion=b6a0ca11186759ad7045d68a5447b1e89f658384 <dcc1c90b28b28b7c493547506297e78653f81952

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.7; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <1036ac6148995feaf486014d32bf26bf993c06a9; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <207bf80362df3fce8ebc9723351dcb1bc6d9ed0f; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <61704e5cf9cd7464b510eb606e7e2978b1160a64; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <88d459e5b5a46da1ef9fd6f52d9439343edeec88; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <a0638db2340ee053ab0450656a763fd111475e54; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <d07ed707467ce05ea9c03412d0c5ee9d0fe386a6; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <d96209626a29ea64666be98c30b30ac82e5f1be6; version=b6a0ca11186759ad7045d68a5447b1e89f658384 <dcc1c90b28b28b7c493547506297e78653f81952

Published CVSS scores

No CVSS assessment is available in this record.

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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