{"id":"CVE-2026-90023","summary":"usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()\n\nPreviously fsg_num_buffers_validate() was removed as it was not\nnecessary due to Kconfig setting the limits for n from 2 to 256 with\ndefault as 2. However, setting the page content in such a way that\nkstrtou8() reflects n value as either 0 or 1 bypasses these\nrestrictions leading to a null pointer dereference if n is 0. Fix\nthis by adding a check for n \u003c 2 and returning -EINVAL if n is\neither 0 or 1 consistent with Kconfig logic.","modified":"2026-09-18T03:48:34.718325260Z","published":"2026-09-16T10:33:26.905Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90023.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9b5b5df5b8dd3c1572ed267200276a44cc67d8e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90023.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90023"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fe5a6c48fd954489f51aab151d5dad9254c76419"},{"fixed":"9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957"},{"fixed":"b9b5b5df5b8dd3c1572ed267200276a44cc67d8e"},{"fixed":"2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90023.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90023.json"}}],"schema_version":"1.9.0"}