CVE-2026-64340 (GCVE-0-2026-64340)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50
VLAI
Title
USB: legousbtower: fix use-after-free on disconnect race
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")
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 11d069f85851997b4ea0adf242ed9672dc749b8f (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < b4222c05066b252b451f9c8c4730b5b60824ea66 (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < ab2bfd7bec4f134b377ec42f513e90c35db94160 (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 766738ecf2b819e54d38763c8d1c8ae6cff14b39 (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 9ba62966461a8e3cc593b62c56ec62eb2d80436d (git)
Affected: 18bcbcfe9ca2308ebffb40068b51803da9315d97 , < 62fc8eb1b1481051f7bab4aa93d79809053dd09f (git)
Create a notification for this product.
Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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{
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              "status": "unaffected",
              "version": "6.18.39",
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
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        }
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          "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\")"
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      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:03.896Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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          "url": "https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66"
        },
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      "title": "USB: legousbtower: fix use-after-free on disconnect race",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64340",
    "datePublished": "2026-07-25T08:50:03.896Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-07-25T08:50:03.896Z",
    "state": "PUBLISHED"
  },
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      "cve": "CVE-2026-64340",
      "date": "2026-07-26",
      "epss": "0.00177",
      "percentile": "0.07457"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-26T01:07:19.000Z",
      "cve": "CVE-2026-64340",
      "id": "msrc_CVE-2026-64340",
      "initial_release_date": "2026-07-26T01:07:19.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "USB: legousbtower: fix use-after-free on disconnect race",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64340.json",
      "version": "1"
    },
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[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\\\")\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/misc/legousbtower.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"11d069f85851997b4ea0adf242ed9672dc749b8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"b4222c05066b252b451f9c8c4730b5b60824ea66\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"ab2bfd7bec4f134b377ec42f513e90c35db94160\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"766738ecf2b819e54d38763c8d1c8ae6cff14b39\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"9ba62966461a8e3cc593b62c56ec62eb2d80436d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18bcbcfe9ca2308ebffb40068b51803da9315d97\",\"lessThan\":\"62fc8eb1b1481051f7bab4aa93d79809053dd09f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/misc/legousbtower.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:28Z",
      "cve": "CVE-2026-64340",
      "id": "CVE-2026-64340",
      "initial_release_date": "2026-07-25T16:01:28Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64340",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64340.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.