CVE-2021-47173: misc/uss720: fix memory leak in uss720_probe
Vulnerability summary
CVE-2021-47173 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.3% 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 7 · Related 7Timeline
- 25-03-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: misc/uss720: fix memory leak in uss720_probe uss720_probe forgets to decrease the refcount of usbdev in uss720_probe. Fix this by decreasing the refcount of usbdev by usb_put_dev. BUG: memory leak unreferenced object 0xffff888101113800 (size 2048): comm "kworker/0:1", pid 7, jiffies 4294956777 (age 28.870s) hex dump (first 32 bytes): ff ff ff ff 31 00 00 00 00 00 00 00 00 00 00 00 ....1........... 00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00 ................ backtrace: [<ffffffff82b8e822>] kmalloc include/linux/slab.h:554 [inline] [<ffffffff82b8e822>] kzalloc include/linux/slab.h:684 [inline] [<ffffffff82b8e822>] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582 [<ffffffff82b98441>] hub_port_connect drivers/usb/core/hub.c:5129 [inline] [<ffffffff82b98441>] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] [<ffffffff82b98441>] port_event drivers/usb/core/hub.c:5509 [inline] [<ffffffff82b98441>] hub_event+0x1171/0x20c0 drivers/usb/core/hub.c:5591 [<ffffffff81259229>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275 [<ffffffff81259b19>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421 [<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
CVSS metrics
4 scores · 3 sources · 2 versions- 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
0.23%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.23% 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.
Ubuntu86 products
- linuxAll versions (No fix recorded) | < 4.4.0-258.292 | < 4.15.0-151.157 | < 5.4.0-80.90
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.4.0-1135.141 | < 4.4.0-1173.188 | < 4.15.0-1109.116 | < 5.4.0-1054.57
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < 5f46b2410db2c8f26b8bb91b40deebf4ec184391 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < 7889c70e6173ef358f3cd7578db127a489035a42 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < bcb30cc8f8befcbdbcf7a016e4dfd4747c54a364 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < 386918878ce4cd676e4607233866e03c9399a46a | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < 36b5ff1db1a4ef4fdbc2bae364344279f033ad88 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < 5394ae9d8c7961dd93807fdf1b12a1dde96b0a55 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < a3c3face38cb49932c62adcc1289914f1c742096 | ≥ 0f36163d3abefbda1b21a330b3fdf3c2dc076d94, < dcb4b8ad6a448532d8b681b5d1a7036210b622de | 2.6.14
- linux_kernel≥ 2.6.14, < 4.4.271 | ≥ 4.5, < 4.9.271 | ≥ 4.10, < 4.14.235 | ≥ 4.15, < 4.19.193 | ≥ 4.20, < 5.4.124 | ≥ 5.5, < 5.10.42 | ≥ 5.11, < 5.12.9
Debian1 product
- linux< 5.14.6-1
3 vendors · 89 products
