CVE-2026-90023 is a vulnerability in Linux Kernel
Published on September 16, 2026
usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()
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.
Products Associated with CVE-2026-90023
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version fe5a6c48fd954489f51aab151d5dad9254c76419 and below 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957 is affected.
- Version fe5a6c48fd954489f51aab151d5dad9254c76419 and below b9b5b5df5b8dd3c1572ed267200276a44cc67d8e is affected.
- Version fe5a6c48fd954489f51aab151d5dad9254c76419 and below 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc is affected.
- Version 4.8 is affected.
- Before 4.8 is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.