CVE-2021-47455 (GCVE-0-2021-47455)
Vulnerability from cvelistv5 – Published: 2024-05-22 06:19 – Updated: 2026-05-23 15:20
VLAI
EPSS
VEX
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.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-10 18:55 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) Affected: 3.16.83 , < 3.17 (semver) Affected: 4.4.224 , < 4.5 (semver) Affected: 4.9.224 , < 4.10 (semver) Affected: 4.14.162 , < 4.15 (semver) Affected: 4.19.93 , < 4.20 (semver) Affected: 5.4.8 , < 5.5 (semver) |
guessed | |
| 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) |
guessed |
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"matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*",
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"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()."
},
{
"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()."
}
],
"id": "CVE-2021-47455",
"lastModified": "2026-06-17T04:17:30.790",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"impactScore": 3.6,
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],
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],
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"timestamp": "2024-06-10T18:55:42.625337Z",
"version": "2.0.3"
}
}
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},
"published": "2024-05-22T07:15:10.530",
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"id": "CVE-2021-47455",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:fixed": "316",
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"source": "Red Hat CSAF VEX",
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"cve": "CVE-2021-47455",
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"initial_release_date": "2024-05-25T03:34:02Z",
"product_status:known_affected": "460",
"product_status:known_not_affected": "65",
"product_status:recommended": "517",
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"status": "interim",
"title": "SUSE CVE CVE-2021-47455",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47455.json",
"version": "73"
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"vulnrichment": {
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},
{
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"title": "CISA ADP Vulnrichment"
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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