CVE-2025-38305 (GCVE-0-2025-38305)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:42 – Updated: 2026-05-11 21:25
VLAI?
Title
ptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < 5d217e7031a5c06d366580fc6ddbf43527b780d4 (git)
Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < b1b73c452331451020be3bf4b014901015ae6663 (git)
Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < 259119595227fd20f6aa29d85abe086b6fdd9eb1 (git)
Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < b93e6fef4eda48e17d9c642b9abad98a066fd4a3 (git)
Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < ef8fc007c28a30a4c0d90bf755e0f343d99bb392 (git)
Affected: 73f37068d540eba5f93ba3a0019bf479d35ebd76 , < 87f7ce260a3c838b49e1dc1ceedf1006795157a2 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.94 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          "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."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38305\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-10T08:15:29.320\",\"lastModified\":\"2025-12-19T17:58:01.803\",\"vulnStatus\":\"Analyzed\",\"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\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14.1\",\"versionEndExcluding\":\"5.15.186\",\"matchCriteriaId\":\"7F369340-2B76-438A-A8D2-7A0F994DC4AC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.142\",\"matchCriteriaId\":\"459B4E94-FE0E-434D-B782-95E3A5FFC6B1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.94\",\"matchCriteriaId\":\"304E3F01-7D7A-4908-994E-7F95C5C00B06\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.34\",\"matchCriteriaId\":\"4FFA54AA-CDFE-4591-BD07-72813D0948F4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.3\",\"matchCriteriaId\":\"0541C761-BD5E-4C1A-8432-83B375D7EB92\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"6A05198E-F8FA-4517-8D0E-8C95066AED38\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"23B9E5C6-FAB5-4A02-9E39-27C8787B0991\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"D185CF67-7E4A-4154-93DB-CE379C67DB56\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"D1DA0AF6-02F4-47C7-A318-8C006ED0C665\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"49DD30B1-8C99-4C38-A66B-CAB3827BEE8A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"15013998-4AF0-4CDC-AB13-829ECD8A8E66\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"376A25CF-C05B-48F1-99B1-8FB0314A8E06\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/259119595227fd20f6aa29d85abe086b6fdd9eb1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5d217e7031a5c06d366580fc6ddbf43527b780d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/87f7ce260a3c838b49e1dc1ceedf1006795157a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b1b73c452331451020be3bf4b014901015ae6663\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b93e6fef4eda48e17d9c642b9abad98a066fd4a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ef8fc007c28a30a4c0d90bf755e0f343d99bb392\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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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.