CVE-2025-21827

Kernel crash via unlocked USB interface claim

Published Mar 6, 2025 · Updated Aug 5, 2026

Race condition in Linux kernel 6.11 before 6.12.13 and 6.13 before 6.13.2 allows local users to crash the kernel. The btusb_mtk_claim_iso_intf path calls usb_driver_claim_interface outside probe without locking the USB interface device, allowing driver claim and runtime power-management teardown to race. A local low-privileged user with access to MediaTek Bluetooth power controls or writable usbfs can trigger stale-pointer reads and writes, a NULL dereference, and a kernel panic where panic-on-oops is enabled.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel 6.11 before 6.12.13 and 6.13 before 6.13.2 allows local users to crash the kernel. The btusb_mtk_claim_iso_intf path calls usb_driver_claim_interface outside probe without locking the USB interface device, allowing driver claim and runtime power-management teardown to race. A local low-privileged user with access to MediaTek Bluetooth power controls or writable usbfs can trigger stale-pointer reads and writes, a NULL dereference, and a kernel panic where panic-on-oops is enabled.

The record

CVE
CVE-2025-21827
Published
Mar 6, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.11
  2. Affected versionversion=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <4194766ec8756f4f654d595ae49962acbac49490
  3. Affected versionversion=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <930e1790b99e5839e1af69d2f7fd808f1fba2df9
  4. Affected versionversion=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <e9087e828827e5a5c85e124ce77503f2b81c3491

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <4194766ec8756f4f654d595ae49962acbac49490; version=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <930e1790b99e5839e1af69d2f7fd808f1fba2df9; version=ceac1cb0259de682d78f5c784ef8e0b13022e9d9 <e9087e828827e5a5c85e124ce77503f2b81c3491

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS: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

T1499.004Application or System Exploitation

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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