CVE-2025-38305 (GCVE-0-2025-38305)
Vulnerability from cvelistv5
Published
2025-07-10 07:42
Modified
2025-07-28 04:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use() There is no disagreement that we should check both ptp->is_virtual_clock and ptp->n_vclocks to check if the ptp virtual clock is in use. However, when we acquire ptp->n_vclocks_mux to read ptp->n_vclocks in ptp_vclock_in_use(), we observe a recursive lock in the call trace starting from n_vclocks_store(). ============================================ WARNING: possible recursive locking detected 6.15.0-rc6 #1 Not tainted -------------------------------------------- syz.0.1540/13807 is trying to acquire lock: ffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at: ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [inline] ffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at: ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415 but task is already holding lock: ffff888030704868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at: n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ptp->n_vclocks_mux); lock(&ptp->n_vclocks_mux); *** DEADLOCK *** .... ============================================ The best way to solve this is to remove the logic that checks ptp->n_vclocks in ptp_vclock_in_use(). The reason why this is appropriate is that any path that uses ptp->n_vclocks must unconditionally check if ptp->n_vclocks is greater than 0 before unregistering vclocks, and all functions are already written this way. And in the function that uses ptp->n_vclocks, we already get ptp->n_vclocks_mux before unregistering vclocks. Therefore, we need to remove the redundant check for ptp->n_vclocks in ptp_vclock_in_use() to prevent recursive locking.
References
Impacted products
Vendor Product Version
Linux Linux Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
Version: 73f37068d540eba5f93ba3a0019bf479d35ebd76
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ptp/ptp_private.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/ptp/ptp_private.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.186",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.186",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.142",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.94",
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                {
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                  "versionEndExcluding": "6.12.34",
                  "versionStartIncluding": "5.14",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: remove ptp-\u003en_vclocks check logic in ptp_vclock_in_use()\n\nThere is no disagreement that we should check both ptp-\u003eis_virtual_clock\nand ptp-\u003en_vclocks to check if the ptp virtual clock is in use.\n\nHowever, when we acquire ptp-\u003en_vclocks_mux to read ptp-\u003en_vclocks in\nptp_vclock_in_use(), we observe a recursive lock in the call trace\nstarting from n_vclocks_store().\n\n============================================\nWARNING: possible recursive locking detected\n6.15.0-rc6 #1 Not tainted\n--------------------------------------------\nsyz.0.1540/13807 is trying to acquire lock:\nffff888035a24868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\n ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [inline]\nffff888035a24868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\n ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415\n\nbut task is already holding lock:\nffff888030704868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\n n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n       CPU0\n       ----\n  lock(\u0026ptp-\u003en_vclocks_mux);\n  lock(\u0026ptp-\u003en_vclocks_mux);\n\n *** DEADLOCK ***\n....\n============================================\n\nThe best way to solve this is to remove the logic that checks\nptp-\u003en_vclocks in ptp_vclock_in_use().\n\nThe reason why this is appropriate is that any path that uses\nptp-\u003en_vclocks must unconditionally check if ptp-\u003en_vclocks is greater\nthan 0 before unregistering vclocks, and all functions are already\nwritten this way. And in the function that uses ptp-\u003en_vclocks, we\nalready get ptp-\u003en_vclocks_mux before unregistering vclocks.\n\nTherefore, we need to remove the redundant check for ptp-\u003en_vclocks in\nptp_vclock_in_use() to prevent recursive locking."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:18:06.998Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5d217e7031a5c06d366580fc6ddbf43527b780d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1b73c452331451020be3bf4b014901015ae6663"
        },
        {
          "url": "https://git.kernel.org/stable/c/259119595227fd20f6aa29d85abe086b6fdd9eb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b93e6fef4eda48e17d9c642b9abad98a066fd4a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef8fc007c28a30a4c0d90bf755e0f343d99bb392"
        },
        {
          "url": "https://git.kernel.org/stable/c/87f7ce260a3c838b49e1dc1ceedf1006795157a2"
        }
      ],
      "title": "ptp: remove ptp-\u003en_vclocks check logic in ptp_vclock_in_use()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38305",
    "datePublished": "2025-07-10T07:42:16.127Z",
    "dateReserved": "2025-04-16T04:51:24.002Z",
    "dateUpdated": "2025-07-28T04:18:06.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38305\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-10T08:15:29.320\",\"lastModified\":\"2025-07-10T13:17:30.017\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nptp: remove ptp-\u003en_vclocks check logic in ptp_vclock_in_use()\\n\\nThere is no disagreement that we should check both ptp-\u003eis_virtual_clock\\nand ptp-\u003en_vclocks to check if the ptp virtual clock is in use.\\n\\nHowever, when we acquire ptp-\u003en_vclocks_mux to read ptp-\u003en_vclocks in\\nptp_vclock_in_use(), we observe a recursive lock in the call trace\\nstarting from n_vclocks_store().\\n\\n============================================\\nWARNING: possible recursive locking detected\\n6.15.0-rc6 #1 Not tainted\\n--------------------------------------------\\nsyz.0.1540/13807 is trying to acquire lock:\\nffff888035a24868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\\n ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [inline]\\nffff888035a24868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\\n ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415\\n\\nbut task is already holding lock:\\nffff888030704868 (\u0026ptp-\u003en_vclocks_mux){+.+.}-{4:4}, at:\\n n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215\\n\\nother info that might help us debug this:\\n Possible unsafe locking scenario:\\n\\n       CPU0\\n       ----\\n  lock(\u0026ptp-\u003en_vclocks_mux);\\n  lock(\u0026ptp-\u003en_vclocks_mux);\\n\\n *** DEADLOCK ***\\n....\\n============================================\\n\\nThe best way to solve this is to remove the logic that checks\\nptp-\u003en_vclocks in ptp_vclock_in_use().\\n\\nThe reason why this is appropriate is that any path that uses\\nptp-\u003en_vclocks must unconditionally check if ptp-\u003en_vclocks is greater\\nthan 0 before unregistering vclocks, and all functions are already\\nwritten this way. And in the function that uses ptp-\u003en_vclocks, we\\nalready get ptp-\u003en_vclocks_mux before unregistering vclocks.\\n\\nTherefore, we need to remove the redundant check for ptp-\u003en_vclocks in\\nptp_vclock_in_use() to prevent recursive locking.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ptp: eliminar la l\u00f3gica de comprobaci\u00f3n de ptp-\u0026gt;n_vclocks en ptp_vclock_in_use(). No hay desacuerdo en que debemos comprobar tanto ptp-\u0026gt;is_virtual_clock como ptp-\u0026gt;n_vclocks para comprobar si el reloj virtual ptp est\u00e1 en uso. Sin embargo, al adquirir ptp-\u0026gt;n_vclocks_mux para leer ptp-\u0026gt;n_vclocks en ptp_vclock_in_use(), observamos un bloqueo recursivo en el seguimiento de llamadas a partir de n_vclocks_store(). ============================================== ADVERTENCIA: posible bloqueo recursivo detectado 6.15.0-rc6 #1 No contaminado -------------------------------------------- syz.0.1540/13807 est\u00e1 intentando adquirir el bloqueo: ffff888035a24868 (\u0026amp;ptp-\u0026gt;n_vclocks_mux){+.+.}-{4:4}, en: ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [en l\u00ednea] ffff888035a24868 (\u0026amp;ptp-\u0026gt;n_vclocks_mux){+.+.}-{4:4}, en: ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415 pero la tarea ya tiene el bloqueo: ffff888030704868 (\u0026amp;ptp-\u0026gt;n_vclocks_mux){+.+.}-{4:4}, en: n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215 otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 ---- lock(\u0026amp;ptp-\u0026gt;n_vclocks_mux); lock(\u0026amp;ptp-\u0026gt;n_vclocks_mux); *** BLOQUEO INTERMEDIO *** .... ============================================== La mejor manera de resolver esto es eliminar la l\u00f3gica que comprueba ptp-\u0026gt;n_vclocks en ptp_vclock_in_use(). Esto es apropiado porque cualquier ruta que use ptp-\u0026gt;n_vclocks debe comprobar incondicionalmente si ptp-\u0026gt;n_vclocks es mayor que 0 antes de anular el registro de vclocks, y todas las funciones ya est\u00e1n escritas de esta manera. En la funci\u00f3n que usa ptp-\u0026gt;n_vclocks, ya obtenemos ptp-\u0026gt;n_vclocks_mux antes de anular el registro de vclocks. Por lo tanto, necesitamos eliminar la comprobaci\u00f3n redundante de ptp-\u0026gt;n_vclocks en ptp_vclock_in_use() para evitar el bloqueo recursivo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/259119595227fd20f6aa29d85abe086b6fdd9eb1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d217e7031a5c06d366580fc6ddbf43527b780d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87f7ce260a3c838b49e1dc1ceedf1006795157a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1b73c452331451020be3bf4b014901015ae6663\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b93e6fef4eda48e17d9c642b9abad98a066fd4a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef8fc007c28a30a4c0d90bf755e0f343d99bb392\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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