CVE-2021-47455

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

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().

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-401

Affected software

VendorProductVersions
LinuxLinux>= a33121e5487b424339636b25c35d3a180eaa5f5e, < f1c96d8085588e1b997a96214b409ac3be20b524; >= a33121e5487b424339636b25c35d3a180eaa5f5e, < 95c0a0c5ec8839f8f21672be786e87a100319ca8; >= a33121e5487b424339636b25c35d3a180eaa5f5e, < 4225fea1cb28370086e17e82c0f69bec2779dca0; 5230ef61882d2d14deb846eb6b48370694816e4c; 6f5e3bb7879ee1eb71c6c3cbaaffbb0da6cd7d57; 89e8fc989feaac00bf1a7f9a766289422e2f5768; 2dece4d6d13fe179ee3a5991811712725a56e2f7; 0393b8720128d5b39db8523e5bfbfc689f18c37c; bfa2e0cd3dfda64fde43c3dca3aeba298d2fe7ad; >= 3.16.83, < 3.17; >= 4.4.224, < 4.5; >= 4.9.224, < 4.10; >= 4.14.162, < 4.15; >= 4.19.93, < 4.20; >= 5.4.8, < 5.5
LinuxLinux5.5

References

Timeline

Published
May 22, 2024
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-47455: Medium severity, CVSS 5.5 | Vulnix