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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90023
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:15 UTC
Updated2026-09-16 11:17:15 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fe5a6c48fd954489f51aab151d5dad9254c76419 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957 git Not specified
CNA Linux Linux affected fe5a6c48fd954489f51aab151d5dad9254c76419 b9b5b5df5b8dd3c1572ed267200276a44cc67d8e git Not specified
CNA Linux Linux affected fe5a6c48fd954489f51aab151d5dad9254c76419 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b9b5b5df5b8dd3c1572ed267200276a44cc67d8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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