CVE-2025-40085 (GCVE-0-2025-40085)

Vulnerability from cvelistv5 – Published: 2025-10-29 13:37 – Updated: 2026-05-23 16:01
VLAI
Title
ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card In try_to_register_card(), the return value of usb_ifnum_to_if() is passed directly to usb_interface_claimed() without a NULL check, which will lead to a NULL pointer dereference when creating an invalid USB audio device. Fix this by adding a check to ensure the interface pointer is valid before passing it to usb_interface_claimed().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 28787ff9fbeaf57684eb64cc33e2ec8ceedf21b5 , < 736159f7b296d7a95f7208eb4799639b1f8b16a0 (git)
Affected: 39efc9c8a973ddff5918191525d1679d0fb368ea , < 8d19a7ab28c7b9c207db5c5282afa8cc8595bcdb (git)
Affected: 39efc9c8a973ddff5918191525d1679d0fb368ea , < 576312eb436326b44b7010f4d9ae2b698df075ea (git)
Affected: 39efc9c8a973ddff5918191525d1679d0fb368ea , < bba7208765d26e5e36b87f21dacc2780b064f41f (git)
Affected: 39efc9c8a973ddff5918191525d1679d0fb368ea , < 8503ac1a62075a085402e42a386b5c627c821a51 (git)
Affected: 39efc9c8a973ddff5918191525d1679d0fb368ea , < 28412b489b088fb88dff488305fd4e56bd47f6e4 (git)
Affected: 9d4f4dc3cd38e412c29a7626489fe48b79ebbf6c (git)
Affected: 52076a41c128146c9df4a157e972cb17019313b1 (git)
Affected: 5.15.75 , < 5.15.196 (semver)
Affected: 5.19.17 , < 5.20 (semver)
Affected: 6.0.3 , < 6.1 (semver)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.114 , ≤ 6.6.* (semver)
Unaffected: 6.12.55 , ≤ 6.12.* (semver)
Unaffected: 6.17.5 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix NULL pointer deference in try_to_register_card\n\nIn try_to_register_card(), the return value of usb_ifnum_to_if() is\npassed directly to usb_interface_claimed() without a NULL check, which\nwill lead to a NULL pointer dereference when creating an invalid\nUSB audio device. Fix this by adding a check to ensure the interface\npointer is valid before passing it to usb_interface_claimed()."
        }
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        "dateUpdated": "2026-05-23T16:01:24.342Z",
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      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40085.json",
      "version": "2"
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:21:14+00:00",
      "cve": "CVE-2025-40085",
      "id": "CVE-2025-40085",
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      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40085.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.