{"id":"CVE-2026-63899","state":"PUBLISHED","title":"USB: serial: mxuport: fix memory corruption with small endpoint","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: mxuport: fix memory corruption with small endpoint\n\nMake sure that the bulk-out endpoint max packet size is at least eight\nbytes to avoid user-controlled slab corruption should a malicious device\nreport a smaller size.","publishedAt":"2026-07-19T14:55:08.116Z","updatedAt":"2026-07-19T14:55:08.116Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"086b858b5f5125bc9d967ea2bd825f83d9f8f29d","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"2f3661eb2446e1ef593da45e01a3b21a906768ec","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"ccbec56f2f9af008f1574335cc6a668f16603e47","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"be3a1ed4ae51fa8dde57383277d336ce834f2cd9","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"e906545641d34fb1a09a65b4b5cfdff40eb09681","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"6c0cf56f00f280d72180bb6ce79741bc787a6269","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"b40166b4ef96067620a0f248e74ad9658c8f680c","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"4085f0dbb1ce2251c9a5938d693de6593f0ab2bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/mxuport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/mxuport.c"]}],"references":["https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d","https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec","https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47","https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9","https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681","https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269","https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c","https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63899.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63899","state":"PUBLISHED","datePublished":"2026-07-19T14:55:08.116Z","dateUpdated":"2026-07-19T14:55:08.116Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.019Z"},"containers":{"cna":{"title":"USB: serial: mxuport: fix memory corruption with small endpoint","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: mxuport: fix memory corruption with small endpoint\n\nMake sure that the bulk-out endpoint max packet size is at least eight\nbytes to avoid user-controlled slab corruption should a malicious device\nreport a smaller size."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"086b858b5f5125bc9d967ea2bd825f83d9f8f29d","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"2f3661eb2446e1ef593da45e01a3b21a906768ec","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"ccbec56f2f9af008f1574335cc6a668f16603e47","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"be3a1ed4ae51fa8dde57383277d336ce834f2cd9","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"e906545641d34fb1a09a65b4b5cfdff40eb09681","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"6c0cf56f00f280d72180bb6ce79741bc787a6269","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"b40166b4ef96067620a0f248e74ad9658c8f680c","versionType":"git"},{"version":"ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e","status":"affected","lessThan":"4085f0dbb1ce2251c9a5938d693de6593f0ab2bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/mxuport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/mxuport.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d"},{"url":"https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec"},{"url":"https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47"},{"url":"https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9"},{"url":"https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681"},{"url":"https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269"},{"url":"https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c"},{"url":"https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:55:08.116Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}