CVE-2021-47455 (GCVE-0-2021-47455)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:19 – Updated: 2026-05-11 13:55
VLAI?
Title
ptp: Fix possible memory leak in ptp_clock_register()
Summary
In the Linux kernel, the following vulnerability has been resolved: ptp: Fix possible memory leak in ptp_clock_register() I got memory leak as follows when doing fault injection test: unreferenced object 0xffff88800906c618 (size 8): comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s) hex dump (first 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0 [<0000000079f6e2ff>] kvasprintf+0xb5/0x150 [<0000000026aae54f>] kvasprintf_const+0x60/0x190 [<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150 [<000000004e35abdd>] dev_set_name+0xc0/0x100 [<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp] [<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] When posix_clock_register() returns an error, the name allocated in dev_set_name() will be leaked, the put_device() should be used to give up the device reference, then the name will be freed in kobject_cleanup() and other memory will be freed in ptp_clock_release().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a33121e5487b424339636b25c35d3a180eaa5f5e , < f1c96d8085588e1b997a96214b409ac3be20b524 (git)
Affected: a33121e5487b424339636b25c35d3a180eaa5f5e , < 95c0a0c5ec8839f8f21672be786e87a100319ca8 (git)
Affected: a33121e5487b424339636b25c35d3a180eaa5f5e , < 4225fea1cb28370086e17e82c0f69bec2779dca0 (git)
Affected: 5230ef61882d2d14deb846eb6b48370694816e4c (git)
Affected: 6f5e3bb7879ee1eb71c6c3cbaaffbb0da6cd7d57 (git)
Affected: 89e8fc989feaac00bf1a7f9a766289422e2f5768 (git)
Affected: 2dece4d6d13fe179ee3a5991811712725a56e2f7 (git)
Affected: 0393b8720128d5b39db8523e5bfbfc689f18c37c (git)
Affected: bfa2e0cd3dfda64fde43c3dca3aeba298d2fe7ad (git)
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Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.14.15 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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      "id": "CVE-2021-47455",
      "lastModified": "2024-11-21T06:36:10.873",
      "published": "2024-05-22T07:15:10.530",
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[\u003c000000004e35abdd\u003e] dev_set_name+0xc0/0x100\\n    [\u003c00000000f20cfe25\u003e] ptp_clock_register+0x9f4/0xd30 [ptp]\\n    [\u003c000000008bb9f0de\u003e] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33]\\n\\nWhen posix_clock_register() returns an error, the name allocated\\nin dev_set_name() will be leaked, the put_device() should be used\\nto give up the device reference, then the name will be freed in\\nkobject_cleanup() and other memory will be freed in ptp_clock_release().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ptp: solucione una posible p\u00e9rdida de memoria en ptp_clock_register() Obtuve una p\u00e9rdida de memoria de la siguiente manera al realizar la prueba de inyecci\u00f3n de fallas: objeto sin referencia 0xffff88800906c618 (tama\u00f1o 8): comm \\\"i2c-idt82p33931\\\", pid 4421, jiffies 4294948083 (edad 13,188 s) volcado hexadecimal (primeros 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [\u0026lt;00000000312ed458\u0026gt;] __kmalloc_track_caller+0x19f/0x3a0 [\u0026lt;0000 000079f6e2ff\u0026gt;] kvasprintf+0xb5 /0x150 [\u0026lt;0000000026aae54f\u0026gt;] kvasprintf_const+0x60/0x190 [\u0026lt;00000000f323a5f7\u0026gt;] kobject_set_name_vargs+0x56/0x150 [\u0026lt;000000004e35abdd\u0026gt;] dev_set_name+0xc0/0x100 0000000f20cfe25\u0026gt;] ptp_clock_register+0x9f4/0xd30 [ptp] [\u0026lt;000000008bb9f0de\u0026gt;] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] Cuando posix_clock_register() devuelve un error, el nombre asignado en dev_set_name() se filtrar\u00e1, se debe usar put_device() para renunciar a la referencia del dispositivo, luego el nombre se liberar\u00e1 kobject_cleanup() y otra memoria se liberar\u00e1n en ptp_clock_release().\"}],\"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\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16.83\",\"versionEndExcluding\":\"3.17\",\"matchCriteriaId\":\"757FC3F8-D35F-4A41-B2EE-FB159111EF5D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.4.224\",\"versionEndExcluding\":\"4.5\",\"matchCriteriaId\":\"9ADA9CD5-A6CD-490F-A93C-4E5C4CEA8414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9.224\",\"versionEndExcluding\":\"4.10\",\"matchCriteriaId\":\"D0E0A17F-F59E-41B5-82D3-6A187EC99B69\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.162\",\"versionEndExcluding\":\"4.15\",\"matchCriteriaId\":\"D8E34938-B599-4B3F-9871-2341E248D9A4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.93\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"D83D88FB-206E-466D-BC71-94C228C5C9E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.8\",\"versionEndExcluding\":\"5.14.15\",\"matchCriteriaId\":\"0B5E1919-20BB-4670-82D1-34EEBD95C3D9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"60134C3A-06E4-48C1-B04F-2903732A4E56\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0460DA88-8FE1-46A2-9DDA-1F1ABA552E71\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"AF55383D-4DF2-45DC-93F7-571F4F978EAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"EBD45831-4B79-42BC-ABC0-86870F0DEA89\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1c96d8085588e1b997a96214b409ac3be20b524\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T17:30:57.924Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47455\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-10T18:55:42.625337Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-10T18:55:48.170Z\"}}], \"cna\": {\"title\": \"ptp: Fix possible memory leak in ptp_clock_register()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a33121e5487b424339636b25c35d3a180eaa5f5e\", \"lessThan\": \"f1c96d8085588e1b997a96214b409ac3be20b524\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a33121e5487b424339636b25c35d3a180eaa5f5e\", \"lessThan\": \"95c0a0c5ec8839f8f21672be786e87a100319ca8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a33121e5487b424339636b25c35d3a180eaa5f5e\", \"lessThan\": \"4225fea1cb28370086e17e82c0f69bec2779dca0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5230ef61882d2d14deb846eb6b48370694816e4c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6f5e3bb7879ee1eb71c6c3cbaaffbb0da6cd7d57\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"89e8fc989feaac00bf1a7f9a766289422e2f5768\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2dece4d6d13fe179ee3a5991811712725a56e2f7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0393b8720128d5b39db8523e5bfbfc689f18c37c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bfa2e0cd3dfda64fde43c3dca3aeba298d2fe7ad\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/ptp/ptp_clock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.241\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.15\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/ptp/ptp_clock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f1c96d8085588e1b997a96214b409ac3be20b524\"}, {\"url\": \"https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8\"}, {\"url\": \"https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nptp: Fix possible memory leak in ptp_clock_register()\\n\\nI got memory leak as follows when doing fault injection test:\\n\\nunreferenced object 0xffff88800906c618 (size 8):\\n  comm \\\"i2c-idt82p33931\\\", pid 4421, jiffies 4294948083 (age 13.188s)\\n  hex dump (first 8 bytes):\\n    70 74 70 30 00 00 00 00                          ptp0....\\n  backtrace:\\n    [\u003c00000000312ed458\u003e] __kmalloc_track_caller+0x19f/0x3a0\\n    [\u003c0000000079f6e2ff\u003e] kvasprintf+0xb5/0x150\\n    [\u003c0000000026aae54f\u003e] kvasprintf_const+0x60/0x190\\n    [\u003c00000000f323a5f7\u003e] kobject_set_name_vargs+0x56/0x150\\n    [\u003c000000004e35abdd\u003e] dev_set_name+0xc0/0x100\\n    [\u003c00000000f20cfe25\u003e] ptp_clock_register+0x9f4/0xd30 [ptp]\\n    [\u003c000000008bb9f0de\u003e] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33]\\n\\nWhen posix_clock_register() returns an error, the name allocated\\nin dev_set_name() will be leaked, the put_device() should be used\\nto give up the device reference, then the name will be freed in\\nkobject_cleanup() and other memory will be freed in ptp_clock_release().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.241\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.15\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.83\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.224\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.224\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.162\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.93\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-08-28T14:42:34.474Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47455\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T17:30:57.924Z\", \"dateReserved\": \"2024-05-21T14:58:30.833Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T06:19:44.700Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




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.