CVE-2025-39997 (GCVE-0-2025-39997)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2026-10-15 01:08
VLAI
Title
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer. However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely. Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF. Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06513dd6d32c37d0364db8488cfdf3e14da238a8 , < e63f049c7764b615d1d50cb486745fa63372b42d (git)
Affected: efaf61052b8ff9ee8968912fbaf02c2847c78ede , < e16985513e89466a236d2a7c202783b4dd0c5a46 (git)
Affected: 647410a7da46067953a53c0d03f8680eff570959 , < dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba (git)
Affected: c611b9e55174e439dcd85a72969b43a95f3827a4 , < 647d6b8d22be12842fde6ed0c56859ebc615f21e (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < af600e7f5526d16146b3ae99f6ad57bfea79ca33 (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 353d8c715cc951a980728133c9dd64ca5a0a186c (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 9f2c0ac1423d5f267e7f1d1940780fc764b0fee3 (git)
Affected: 62066758d2ae169278e5d6aea5995b1b6f6ddeb5 (git)
Affected: 6.1.167 , < 6.1.175 (semver)
Affected: 6.15.3 , < 6.16 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.16.11 , ≤ 6.16.* (semver)
Unaffected: 6.17.1 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:19:21+00:00",
      "cve": "CVE-2025-39997",
      "id": "CVE-2025-39997",
      "initial_release_date": "2025-10-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-After-Free in ALSA USB audio due to race condition",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39997.json",
      "version": "3"
    }
  }
}



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