CVE-2026-90023 PUBLISHED

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

Assigner: Linux
Reserved: 11.09.2026 Published: 16.09.2026 Updated: 16.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from fe5a6c48fd954489f51aab151d5dad9254c76419 to 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957 (excl.)
  • affected from fe5a6c48fd954489f51aab151d5dad9254c76419 to b9b5b5df5b8dd3c1572ed267200276a44cc67d8e (excl.)
  • affected from fe5a6c48fd954489f51aab151d5dad9254c76419 to 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.8 is affected
  • unaffected from 0 to 4.8 (excl.)
  • unaffected from 6.18.52 to 6.18.* (incl.)
  • unaffected from 7.2.5 to 7.2.* (incl.)
  • unaffected from 7.3-rc2 to * (incl.)

References