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ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-39997

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-39997

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "06513dd6d32c37d0364db8488cfdf3e14da238a8",
        "lessThan": "e63f049c7764b615d1d50cb486745fa63372b42d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efaf61052b8ff9ee8968912fbaf02c2847c78ede",
        "lessThan": "e16985513e89466a236d2a7c202783b4dd0c5a46",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "647410a7da46067953a53c0d03f8680eff570959",
        "lessThan": "dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c611b9e55174e439dcd85a72969b43a95f3827a4",
        "lessThan": "647d6b8d22be12842fde6ed0c56859ebc615f21e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
        "lessThan": "af600e7f5526d16146b3ae99f6ad57bfea79ca33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
        "lessThan": "353d8c715cc951a980728133c9dd64ca5a0a186c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
        "lessThan": "9f2c0ac1423d5f267e7f1d1940780fc764b0fee3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "62066758d2ae169278e5d6aea5995b1b6f6ddeb5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.1.167",
        "lessThan": "6.1.175",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.15.3",
        "lessThan": "6.16",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "sound/usb/midi.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.1",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/usb/midi.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39997

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27079 · Revision 1
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Publisher date
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