FKIE_CVE-2026-64340

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: legousbtower: fix use-after-free on disconnect race mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1] a51749ab34d9 ("locking/mutex: Document that mutex_unlock() is non-atomic") [2] 2b9d9e0a9ba0 ("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked")
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/misc/legousbtower.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "11d069f85851997b4ea0adf242ed9672dc749b8f",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "b4222c05066b252b451f9c8c4730b5b60824ea66",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "ab2bfd7bec4f134b377ec42f513e90c35db94160",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "766738ecf2b819e54d38763c8d1c8ae6cff14b39",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "9ba62966461a8e3cc593b62c56ec62eb2d80436d",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            },
            {
              "lessThan": "62fc8eb1b1481051f7bab4aa93d79809053dd09f",
              "status": "affected",
              "version": "18bcbcfe9ca2308ebffb40068b51803da9315d97",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/misc/legousbtower.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: legousbtower: fix use-after-free on disconnect race\n\nmutex_unlock() may access the mutex structure after releasing the lock\nand therefore cannot be used to manage lifetime of objects directly\n(unlike spinlocks and refcounts). [1][2]\n\nUse a kref to release the driver data to avoid use-after-free in\nmutex_unlock() when release() races with disconnect().\n\n[1] a51749ab34d9 (\"locking/mutex: Document that mutex_unlock() is\n                   non-atomic\")\n[2] 2b9d9e0a9ba0 (\"locking/mutex: Clarify that mutex_unlock(), and most\n                   other sleeping locks, can still use the lock object\n                   after it\u0027s unlocked\")"
    }
  ],
  "id": "CVE-2026-64340",
  "lastModified": "2026-07-25T10:17:15.983",
  "metrics": {},
  "published": "2026-07-25T10:17:15.983",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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