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CVE-2026-64347— usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler

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基金会开源的一款操作系统内核。 Linux kernel 4.3版本存在安全漏洞，该漏洞源于USB_DT_OTG处理函数中list_first_entry()在空列表时不会返回NULL，导致空配置列表检查失效，可能读取未初始化内存，造成内存读取错误或KASAN故障。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.10% · P1

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 53e6242db8d60da0587d36951cc9434d1a1c21dd< 2454264b2ab4cf0055c0bfd39e79f830452bd0db affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< d3e72cfef2e38bd588055739a8100d14f9773b17 affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< 56add2b9b2e89ec61c0761165d758f73004fdfdf affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< 91b3ecd34b60f950c50c560974945b6596a6f207 affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< fcb21bf747640c9d6bd1eda9da85420f076d59c1 affected
53e6242db8d60da0587d36951cc9434d1a1c21dd< f8f680609c2b3ab795ffcd6f21585b6dfc46d395 affected
… +10 more rows
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I. Basic Information for CVE-2026-64347

Vulnerability Information
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Vulnerability Title
usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler The OTG branch of composite_setup() falls back to the first configuration when none is selected: if (cdev->config) config = cdev->config; else config = list_first_entry(&cdev->configs, struct usb_configuration, list); if (!config) goto done; ... memcpy(req->buf, config->descriptors[0], value); list_first_entry() never returns NULL. On an empty list it returns container_of() of the list head. So the "if (!config)" check is dead. When cdev->configs is empty, config points at the head inside struct usb_composite_dev. config->descriptors[0] reads whatever sits at that offset. The memcpy copies up to w_length bytes of it into the response buffer. cdev->configs can be empty in two cases. One is a teardown race on gadget unbind with a control transfer in flight. The other is a driver that sets is_otg before it adds a config. A reproducer that holds cdev->configs empty triggers a KASAN fault in this branch. Use list_first_entry_or_null() so the existing check does its job.
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基金会开源的一款操作系统内核。 Linux kernel 4.3版本存在安全漏洞，该漏洞源于USB_DT_OTG处理函数中list_first_entry()在空列表时不会返回NULL，导致空配置列表检查失效，可能读取未初始化内存，造成内存读取错误或KASAN故障。
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 53e6242db8d60da0587d36951cc9434d1a1c21dd ~ 2454264b2ab4cf0055c0bfd39e79f830452bd0db -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-64347

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III. Intelligence Information for CVE-2026-64347

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Patches & Fixes for CVE-2026-64347 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64347

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