CVE-2025-40085

Kernel crash via unchecked USB interface lookup

Published Oct 29, 2025 · Updated Oct 29, 2025

NULL dereference in the ALSA USB-audio driver in affected Linux kernel releases allows attackers to crash the kernel with an invalid USB device. The try_to_register_card() function passes usb_ifnum_to_if() output to usb_interface_claimed() without checking whether the lookup returned NULL. Reaching the fault requires presenting malformed USB audio-device state, and the resulting kernel oops can interrupt the host or become a panic under configured kernel fault handling.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in the ALSA USB-audio driver in affected Linux kernel releases allows attackers to crash the kernel with an invalid USB device. The try_to_register_card() function passes usb_ifnum_to_if() output to usb_interface_claimed() without checking whether the lookup returned NULL. Reaching the fault requires presenting malformed USB audio-device state, and the resulting kernel oops can interrupt the host or become a panic under configured kernel fault handling.

The record

CVE
CVE-2025-40085
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2025Record 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=28787ff9fbeaf57684eb64cc33e2ec8ceedf21b5 <736159f7b296d7a95f7208eb4799639b1f8b16a0
  2. Affected versionversion=39efc9c8a973ddff5918191525d1679d0fb368ea <28412b489b088fb88dff488305fd4e56bd47f6e4
  3. Affected versionversion=39efc9c8a973ddff5918191525d1679d0fb368ea <576312eb436326b44b7010f4d9ae2b698df075ea
  4. Affected versionversion=39efc9c8a973ddff5918191525d1679d0fb368ea <8503ac1a62075a085402e42a386b5c627c821a51
  5. Affected versionversion=39efc9c8a973ddff5918191525d1679d0fb368ea <8d19a7ab28c7b9c207db5c5282afa8cc8595bcdb
  6. Affected versionversion=39efc9c8a973ddff5918191525d1679d0fb368ea <bba7208765d26e5e36b87f21dacc2780b064f41f
  7. Affected versionversion=52076a41c128146c9df4a157e972cb17019313b1
  8. Affected versionversion=6.1
  9. Affected versionversion=9d4f4dc3cd38e412c29a7626489fe48b79ebbf6c

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=28787ff9fbeaf57684eb64cc33e2ec8ceedf21b5 <736159f7b296d7a95f7208eb4799639b1f8b16a0; version=39efc9c8a973ddff5918191525d1679d0fb368ea <28412b489b088fb88dff488305fd4e56bd47f6e4; version=39efc9c8a973ddff5918191525d1679d0fb368ea <576312eb436326b44b7010f4d9ae2b698df075ea; version=39efc9c8a973ddff5918191525d1679d0fb368ea <8503ac1a62075a085402e42a386b5c627c821a51; version=39efc9c8a973ddff5918191525d1679d0fb368ea <8d19a7ab28c7b9c207db5c5282afa8cc8595bcdb; version=39efc9c8a973ddff5918191525d1679d0fb368ea <bba7208765d26e5e36b87f21dacc2780b064f41f; version=52076a41c128146c9df4a157e972cb17019313b1; version=6.1; version=9d4f4dc3cd38e412c29a7626489fe48b79ebbf6c

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

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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)
Vectorphysical
PrivilegesUnavailable
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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