{"id":"CVE-2026-90023","state":"PUBLISHED","title":"usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()","description":"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 < 2 and returning -EINVAL if n is\neither 0 or 1 consistent with Kconfig logic.","publishedAt":"2026-09-16T10:33:26.905Z","updatedAt":"2026-10-30T12:33:51.550Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"38edd187a37db0d8e4bf84cc954dbdbe7bfa366f","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"e54820b9dc1d6d731ecc3e51462445dc952906a7","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"5d56dbaeb81d5cd967cdee8ddcc70814b7139246","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"51cc9af4f2d3f0b765266aced66b9b532b423b13","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"b9b5b5df5b8dd3c1572ed267200276a44cc67d8e","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_mass_storage.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_mass_storage.c"]}],"references":["https://git.kernel.org/stable/c/38edd187a37db0d8e4bf84cc954dbdbe7bfa366f","https://git.kernel.org/stable/c/e54820b9dc1d6d731ecc3e51462445dc952906a7","https://git.kernel.org/stable/c/5d56dbaeb81d5cd967cdee8ddcc70814b7139246","https://git.kernel.org/stable/c/f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf","https://git.kernel.org/stable/c/51cc9af4f2d3f0b765266aced66b9b532b423b13","https://git.kernel.org/stable/c/9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957","https://git.kernel.org/stable/c/b9b5b5df5b8dd3c1572ed267200276a44cc67d8e","https://git.kernel.org/stable/c/2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90023.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90023","state":"PUBLISHED","datePublished":"2026-09-16T10:33:26.905Z","dateUpdated":"2026-10-30T12:33:51.550Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.782Z"},"containers":{"cna":{"title":"usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()","descriptions":[{"lang":"en","value":"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 < 2 and returning -EINVAL if n is\neither 0 or 1 consistent with Kconfig logic."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"38edd187a37db0d8e4bf84cc954dbdbe7bfa366f","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"e54820b9dc1d6d731ecc3e51462445dc952906a7","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"5d56dbaeb81d5cd967cdee8ddcc70814b7139246","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"51cc9af4f2d3f0b765266aced66b9b532b423b13","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"b9b5b5df5b8dd3c1572ed267200276a44cc67d8e","versionType":"git"},{"version":"fe5a6c48fd954489f51aab151d5dad9254c76419","status":"affected","lessThan":"2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_mass_storage.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_mass_storage.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/38edd187a37db0d8e4bf84cc954dbdbe7bfa366f"},{"url":"https://git.kernel.org/stable/c/e54820b9dc1d6d731ecc3e51462445dc952906a7"},{"url":"https://git.kernel.org/stable/c/5d56dbaeb81d5cd967cdee8ddcc70814b7139246"},{"url":"https://git.kernel.org/stable/c/f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf"},{"url":"https://git.kernel.org/stable/c/51cc9af4f2d3f0b765266aced66b9b532b423b13"},{"url":"https://git.kernel.org/stable/c/9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957"},{"url":"https://git.kernel.org/stable/c/b9b5b5df5b8dd3c1572ed267200276a44cc67d8e"},{"url":"https://git.kernel.org/stable/c/2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:33:51.550Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}