CVE-2025-38555

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget : fix use-after-free in composite_dev_cleanup()

1. In func configfs_composite_bind() -> composite_os_desc_req_prepare(): if kmalloc fails, the pointer cdev->os_desc_req will be freed but not set to NULL. Then it will return a failure to the upper-level function.
2. in func configfs_composite_bind() -> composite_dev_cleanup(): it will checks whether cdev->os_desc_req is NULL. If it is not NULL, it will attempt to use it.This will lead to a use-after-free issue.

BUG: KASAN: use-after-free in composite_dev_cleanup+0xf4/0x2c0 Read of size 8 at addr 0000004827837a00 by task init/1

CPU: 10 PID: 1 Comm: init Tainted: G O 5.10.97-oh #1 kasan_report+0x188/0x1cc __asan_load8+0xb4/0xbc composite_dev_cleanup+0xf4/0x2c0 configfs_composite_bind+0x210/0x7ac udc_bind_to_driver+0xb4/0x1ec usb_gadget_probe_driver+0xec/0x21c gadget_dev_desc_UDC_store+0x264/0x27c

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/151c0aa896c47a4459e07fee7d4843f44c1bb18e
• https://git.kernel.org/stable/c/2db29235e900a084a656dea7e0939b0abb7bb897
• https://git.kernel.org/stable/c/5f06ee9f9a3665d43133f125c17e5258a13f3963
• https://git.kernel.org/stable/c/8afb22aa063f706f3343707cdfb8cda4d021dd33
• https://git.kernel.org/stable/c/aada327a9f8028c573636fa60c0abc80fb8135c9
• https://git.kernel.org/stable/c/bd3c4ef60baf7f65c963f3e12d9d7b2b091e20ba
• https://git.kernel.org/stable/c/dba96dfa5a0f685b959dd28a52ac8dab0b805204
• https://git.kernel.org/stable/c/e1be1f380c82a69f80c68c96a7cfe8759fb30355
• https://git.kernel.org/stable/c/e624bf26127645a2f7821e73fdf6dc64bad07835
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html