CVE-2021-47455: ptp: Fix possible memory leak in ptp_clock_register()
Vulnerability summary
CVE-2021-47455 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.7% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 6Timeline
- 22-05-2024PublishedVulnerability first disclosed.
- 23-05-2026Last modifiedVulnerability information updated.
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().
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
15%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.24% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu90 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 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 | 5.5
- linux_kernel≥ 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, < 5.14.15 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3 | 5.15:rc4 | 5.15:rc5 | 5.15:rc6
Debian1 product
- linux< 5.14.16-1
3 vendors · 93 products
