SB2026091672 - Use-after-free in Linux kernel gadget function driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-90045)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to compromise confidentiality, integrity, and availability.

The vulnerability exists due to a use-after-free in the FunctionFS asynchronous I/O handling in drivers/usb/gadget/function/f_fs.c when asynchronous read requests remain pending after the submitting task exits. A local user can queue an asynchronous read request and exit before completion handling finishes to compromise confidentiality, integrity, and availability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5eb5c72c72fef76cb765ef1669b62b6a3ba1bfc8
• https://git.kernel.org/stable/c/7411de0ce3b45286de1de82526795658ea6eacb0
• https://git.kernel.org/stable/c/f3d31484b3f26d63c09e5569ebfaa1079a17f171