CVE-2026-90023

Summary

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

usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()

Previously fsg_num_buffers_validate() was removed as it was not necessary due to Kconfig setting the limits for n from 2 to 256 with default as 2. However, setting the page content in such a way that kstrtou8() reflects n value as either 0 or 1 bypasses these restrictions leading to a null pointer dereference if n is 0. Fix this by adding a check for n < 2 and returning -EINVAL if n is either 0 or 1 consistent with Kconfig logic.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfe5a6c48fd954489f51aab151d5dad9254c76419 < 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957affected
LinuxLinuxfe5a6c48fd954489f51aab151d5dad9254c76419 < b9b5b5df5b8dd3c1572ed267200276a44cc67d8eaffected
LinuxLinuxfe5a6c48fd954489f51aab151d5dad9254c76419 < 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bcaffected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References