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CVE-2026-90023

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.6.160, 6.12.112, 6.18.52, 7.2.5
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    Version range not reported

  • Linux Linux

    4.8

  • KernelLinux

    From 4.8.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org