github - ghsa-jh7w-53hp-qjqh

GHSA-JH7W-53HP-QJQH

Vulnerability from github – Published: 2025-12-04 18:30 – Updated: 2025-12-04 18:30

Details

In the Linux kernel, the following vulnerability has been resolved:

most: usb: Fix use-after-free in hdm_disconnect

hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface->dev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing.

The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts).

Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface().

This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40223"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-04T16:16:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmost: usb: Fix use-after-free in hdm_disconnect\n\nhdm_disconnect() calls most_deregister_interface(), which eventually\nunregisters the MOST interface device with device_unregister(iface-\u003edev).\nIf that drops the last reference, the device core may call release_mdev()\nimmediately while hdm_disconnect() is still executing.\n\nThe old code also freed several mdev-owned allocations in\nhdm_disconnect() and then performed additional put_device() calls.\nDepending on refcount order, this could lead to use-after-free or\ndouble-free when release_mdev() ran (or when unregister paths also\nperformed puts).\n\nFix by moving the frees of mdev-owned allocations into release_mdev(),\nso they happen exactly once when the device is truly released, and by\ndropping the extra put_device() calls in hdm_disconnect() that are\nredundant after device_unregister() and most_deregister_interface().\n\nThis addresses the KASAN slab-use-after-free reported by syzbot in\nhdm_disconnect(). See report and stack traces in the bug link below.",
  "id": "GHSA-jh7w-53hp-qjqh",
  "modified": "2025-12-04T18:30:52Z",
  "published": "2025-12-04T18:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40223"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/578eb18cd111addec94c43f61cd4b4429e454809"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f93a84ffb884d761a9d4e869ba29c238711e81f1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-40223 (GCVE-0-2025-40223)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2025-12-04 15:31

Summary

In the Linux kernel, the following vulnerability has been resolved: most: usb: Fix use-after-free in hdm_disconnect hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface->dev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing. The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts). Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface(). This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/5b5c478f09b1b35e7…
	https://git.kernel.org/stable/c/578eb18cd111addec…
	https://git.kernel.org/stable/c/33daf469f5294b9d0…
	https://git.kernel.org/stable/c/72427dc6f87523995…
	https://git.kernel.org/stable/c/f93a84ffb884d761a…
	https://git.kernel.org/stable/c/3a3b8e89c7201c5b3…
	https://git.kernel.org/stable/c/4b1270902609ef0d9…

Impacted products

Vendor

Product

Version

Linux

Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831 (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 578eb18cd111addec94c43f61cd4b4429e454809 (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 33daf469f5294b9d07c4fc98216cace9f4f34cc6 (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 72427dc6f87523995f4e6ae35a948bb2992cabce (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < f93a84ffb884d761a9d4e869ba29c238711e81f1 (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6 (git)
Affected: 97a6f772f36b7f52bcfa56a581bbd2470cffe23d , < 4b1270902609ef0d935ed2faa2ea6d122bd148f5 (git)

Linux

Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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              "versionType": "git"
            },
            {
              "lessThan": "578eb18cd111addec94c43f61cd4b4429e454809",
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            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
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        {
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6"
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          "url": "https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5"
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      ],
      "title": "most: usb: Fix use-after-free in hdm_disconnect",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40223",
    "datePublished": "2025-12-04T15:31:15.158Z",
    "dateReserved": "2025-04-16T07:20:57.180Z",
    "dateUpdated": "2025-12-04T15:31:15.158Z",
    "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-JH7W-53HP-QJQH

CVE-2025-40223 (GCVE-0-2025-40223)

Tags

Sightings

Nomenclature