github - ghsa-xc3r-7j5x-74w4

GHSA-XC3R-7J5X-74W4

Vulnerability from github – Published: 2025-10-15 09:30 – Updated: 2025-10-15 09:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39997"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-15T08:15:37Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free\n\nThe previous commit 0718a78f6a9f (\"ALSA: usb-audio: Kill timer properly at\nremoval\") patched a UAF issue caused by the error timer.\n\nHowever, because the error timer kill added in this patch occurs after the\nendpoint delete, a race condition to UAF still occurs, albeit rarely.\n\nAdditionally, since kill-cleanup for urb is also missing, freed memory can\nbe accessed in interrupt context related to urb, which can cause UAF.\n\nTherefore, to prevent this, error timer and urb must be killed before\nfreeing the heap memory.",
  "id": "GHSA-xc3r-7j5x-74w4",
  "modified": "2025-10-15T09:30:17Z",
  "published": "2025-10-15T09:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39997"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2025-12-01 06:16

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

References

URL

Tags

	https://git.kernel.org/stable/c/dc4874366cf6cf4a3…
	https://git.kernel.org/stable/c/647d6b8d22be12842…
	https://git.kernel.org/stable/c/af600e7f5526d1614…
	https://git.kernel.org/stable/c/353d8c715cc951a98…
	https://git.kernel.org/stable/c/9f2c0ac1423d5f267…

Impacted products

Vendor

Product

Version

Linux

Affected: 647410a7da46067953a53c0d03f8680eff570959 , < dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba (git)
Affected: c611b9e55174e439dcd85a72969b43a95f3827a4 , < 647d6b8d22be12842fde6ed0c56859ebc615f21e (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < af600e7f5526d16146b3ae99f6ad57bfea79ca33 (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 353d8c715cc951a980728133c9dd64ca5a0a186c (git)
Affected: 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 , < 9f2c0ac1423d5f267e7f1d1940780fc764b0fee3 (git)
Affected: 62066758d2ae169278e5d6aea5995b1b6f6ddeb5 (git)

Linux

Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.16.11 , ≤ 6.16.* (semver)
Unaffected: 6.17.1 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba",
              "status": "affected",
              "version": "647410a7da46067953a53c0d03f8680eff570959",
              "versionType": "git"
            },
            {
              "lessThan": "647d6b8d22be12842fde6ed0c56859ebc615f21e",
              "status": "affected",
              "version": "c611b9e55174e439dcd85a72969b43a95f3827a4",
              "versionType": "git"
            },
            {
              "lessThan": "af600e7f5526d16146b3ae99f6ad57bfea79ca33",
              "status": "affected",
              "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
              "versionType": "git"
            },
            {
              "lessThan": "353d8c715cc951a980728133c9dd64ca5a0a186c",
              "status": "affected",
              "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
              "versionType": "git"
            },
            {
              "lessThan": "9f2c0ac1423d5f267e7f1d1940780fc764b0fee3",
              "status": "affected",
              "version": "0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62066758d2ae169278e5d6aea5995b1b6f6ddeb5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.11",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.15.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free\n\nThe previous commit 0718a78f6a9f (\"ALSA: usb-audio: Kill timer properly at\nremoval\") patched a UAF issue caused by the error timer.\n\nHowever, because the error timer kill added in this patch occurs after the\nendpoint delete, a race condition to UAF still occurs, albeit rarely.\n\nAdditionally, since kill-cleanup for urb is also missing, freed memory can\nbe accessed in interrupt context related to urb, which can cause UAF.\n\nTherefore, to prevent this, error timer and urb must be killed before\nfreeing the heap memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:16:08.694Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e"
        },
        {
          "url": "https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33"
        },
        {
          "url": "https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3"
        }
      ],
      "title": "ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39997",
    "datePublished": "2025-10-15T07:58:21.702Z",
    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2025-12-01T06:16:08.694Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-XC3R-7J5X-74W4

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

Tags

Sightings

Nomenclature