CVE-2026-53025

Kernel crash via Greybus chardev use-after-free

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the Linux Kernel Greybus raw driver allows local users to crash the kernel by closing a disconnected raw chardev. The disconnect callback frees gb_raw while its embedded cdev can remain open, so a later cdev_put dereferences the freed structure. Reachability requires an open Greybus raw character device to outlive bundle disconnection; the reported panic occurs with CONFIG_INIT_ON_FREE_DEFAULT_ON enabled.

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 the Linux Kernel Greybus raw driver allows local users to crash the kernel by closing a disconnected raw chardev. The disconnect callback frees gb_raw while its embedded cdev can remain open, so a later cdev_put dereferences the freed structure. Reachability requires an open Greybus raw character device to outlive bundle disconnection; the reported panic occurs with CONFIG_INIT_ON_FREE_DEFAULT_ON enabled.

The record

CVE
CVE-2026-53025
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=4.9
  2. Affected versionversion=e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 <983cc2c7efbce04ecbf6328448d895044dd6ab31
  3. Affected versionversion=e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 <ef2d97c15b19b3489de01695bce478601e236c3e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.9; version=e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 <983cc2c7efbce04ecbf6328448d895044dd6ab31; version=e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 <ef2d97c15b19b3489de01695bce478601e236c3e

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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499Endpoint Denial of Service

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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