{"id":"CVE-2026-63956","state":"PUBLISHED","title":"USB: serial: cypress_m8: fix memory corruption with small endpoint","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: fix memory corruption with small endpoint\n\nMake sure that the interrupt-out endpoint max packet size is at least\neight bytes to avoid user-controlled slab corruption or NULL-pointer\ndereference should a malicious device report a smaller size.","publishedAt":"2026-07-19T14:55:47.597Z","updatedAt":"2026-07-19T14:55:47.597Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"4fcb22218f0a7229b7ce3b3952fb644def293fa5","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"ad3d1628a46134276546d7a12fedf04be9979158","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"52e18ae0c47c5c89e18fcd8022f287f7cc8802ec","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"4bcaa59f403dbde6328604a500d65ee8d40975d9","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"1ef25704bd3b625fd151c09feee459479f71ee64","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"284105c40fc31fff90cdab8a0377aaeb92f87f0e","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"6c13f3bb652bc8665e709ba07122612586aea648","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"e1a9d791fd66ab2431b9e6f6f835823809869047","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/cypress_m8.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","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/cypress_m8.c"]}],"references":["https://git.kernel.org/stable/c/4fcb22218f0a7229b7ce3b3952fb644def293fa5","https://git.kernel.org/stable/c/ad3d1628a46134276546d7a12fedf04be9979158","https://git.kernel.org/stable/c/52e18ae0c47c5c89e18fcd8022f287f7cc8802ec","https://git.kernel.org/stable/c/4bcaa59f403dbde6328604a500d65ee8d40975d9","https://git.kernel.org/stable/c/1ef25704bd3b625fd151c09feee459479f71ee64","https://git.kernel.org/stable/c/284105c40fc31fff90cdab8a0377aaeb92f87f0e","https://git.kernel.org/stable/c/6c13f3bb652bc8665e709ba07122612586aea648","https://git.kernel.org/stable/c/e1a9d791fd66ab2431b9e6f6f835823809869047"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63956.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63956","state":"PUBLISHED","datePublished":"2026-07-19T14:55:47.597Z","dateUpdated":"2026-07-19T14:55:47.597Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.023Z"},"containers":{"cna":{"title":"USB: serial: cypress_m8: fix memory corruption with small endpoint","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: fix memory corruption with small endpoint\n\nMake sure that the interrupt-out endpoint max packet size is at least\neight bytes to avoid user-controlled slab corruption or NULL-pointer\ndereference should a malicious device report a smaller size."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"4fcb22218f0a7229b7ce3b3952fb644def293fa5","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"ad3d1628a46134276546d7a12fedf04be9979158","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"52e18ae0c47c5c89e18fcd8022f287f7cc8802ec","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"4bcaa59f403dbde6328604a500d65ee8d40975d9","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"1ef25704bd3b625fd151c09feee459479f71ee64","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"284105c40fc31fff90cdab8a0377aaeb92f87f0e","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"6c13f3bb652bc8665e709ba07122612586aea648","versionType":"git"},{"version":"3416eaa1f8f8d516b77de514e14cf8da256d28fb","status":"affected","lessThan":"e1a9d791fd66ab2431b9e6f6f835823809869047","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/cypress_m8.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","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/cypress_m8.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4fcb22218f0a7229b7ce3b3952fb644def293fa5"},{"url":"https://git.kernel.org/stable/c/ad3d1628a46134276546d7a12fedf04be9979158"},{"url":"https://git.kernel.org/stable/c/52e18ae0c47c5c89e18fcd8022f287f7cc8802ec"},{"url":"https://git.kernel.org/stable/c/4bcaa59f403dbde6328604a500d65ee8d40975d9"},{"url":"https://git.kernel.org/stable/c/1ef25704bd3b625fd151c09feee459479f71ee64"},{"url":"https://git.kernel.org/stable/c/284105c40fc31fff90cdab8a0377aaeb92f87f0e"},{"url":"https://git.kernel.org/stable/c/6c13f3bb652bc8665e709ba07122612586aea648"},{"url":"https://git.kernel.org/stable/c/e1a9d791fd66ab2431b9e6f6f835823809869047"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:55:47.597Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}