CVE-2021-47455

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  2. Vulnerabilities (CVE)
  3. CVE-2021-47455

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

I

n 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().

References
Link Resource
https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 Patch
https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 Patch
https://git.kernel.org/stable/c/f1c96d8085588e1b997a96214b409ac3be20b524
https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 Patch
https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
History

03 Nov 2025, 18:15

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html -

28 Aug 2025, 15:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/f1c96d8085588e1b997a96214b409ac3be20b524 -

14 Jan 2025, 15:38

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 - () https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 - Patch
References () https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 - () https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-401

21 Nov 2024, 06:36

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ptp: solucione una posible pérdida de memoria en ptp_clock_register() Obtuve una pérdida de memoria de la siguiente manera al realizar la prueba de inyección de fallas: objeto sin referencia 0xffff88800906c618 (tamaño 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: [&lt;00000000312ed458&gt;] __kmalloc_track_caller+0x19f/0x3a0 [&lt;0000 000079f6e2ff&gt;] kvasprintf+0xb5 /0x150 [&lt;0000000026aae54f&gt;] kvasprintf_const+0x60/0x190 [&lt;00000000f323a5f7&gt;] kobject_set_name_vargs+0x56/0x150 [&lt;000000004e35abdd&gt;] dev_set_name+0xc0/0x100 0000000f20cfe25&gt;] ptp_clock_register+0x9f4/0xd30 [ptp] [&lt;000000008bb9f0de&gt;] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] Cuando posix_clock_register() devuelve un error, el nombre asignado en dev_set_name() se filtrará, se debe usar put_device() para renunciar a la referencia del dispositivo, luego el nombre se liberará kobject_cleanup() y otra memoria se liberarán en ptp_clock_release().
References () https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 - () https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0 -
References () https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 - () https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 -

22 May 2024, 07:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-22 07:15

Updated : 2025-11-03 18:15

NVD link : CVE-2021-47455

Mitre link : CVE-2021-47455

CVE.ORG link : CVE-2021-47455

JSON object : View

Products Affected

linux

CWE
CWE-401

Missing Release of Memory after Effective Lifetime