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CVE-2025-21838— usb: gadget: core: flush gadget workqueue after device removal

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于设备移除后未刷新gadget工作队列。

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15< e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266 affected
5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15< 859cb45aefa6de823b2fa7f229fe6d9562c9f3b7 affected
5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15< f894448f3904d7ad66fecef8f01fe0172629e091 affected
5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15< 97695b5a1b5467a4f91194db12160f56da445dfe affected
5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15< 399a45e5237ca14037120b1b895bd38a3b4492ea affected
3.12 affected
< 3.12 unaffected
6.1.130≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-21838

Vulnerability Information
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Vulnerability Title
usb: gadget: core: flush gadget workqueue after device removal
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: core: flush gadget workqueue after device removal device_del() can lead to new work being scheduled in gadget->work workqueue. This is observed, for example, with the dwc3 driver with the following call stack: device_del() gadget_unbind_driver() usb_gadget_disconnect_locked() dwc3_gadget_pullup() dwc3_gadget_soft_disconnect() usb_gadget_set_state() schedule_work(&gadget->work) Move flush_work() after device_del() to ensure the workqueue is cleaned up.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于设备移除后未刷新gadget工作队列。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 ~ e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266 -
Linux Linux 3.12 -

II. Public POCs for CVE-2025-21838

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III. Intelligence Information for CVE-2025-21838

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Patches & Fixes for CVE-2025-21838 (5)

Same Patch Batch · Linux · 2025-03-07 · 8 CVEs total

CVE-2025-21836 7.8 HIGH io_uring/kbuf: reallocate buf lists on upgrade
CVE-2025-21842 7.8 HIGH amdkfd: properly free gang_ctx_bo when failed to init user queue
CVE-2025-21839 7.3 HIGH KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop
CVE-2025-21835 usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
CVE-2025-21840 thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header
CVE-2025-21841 cpufreq/amd-pstate: Fix cpufreq_policy ref counting
CVE-2025-21843 drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux