{"id":"CVE-2026-64270","state":"PUBLISHED","title":"Input: mms114 - reject an oversized device packet size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: mms114 - reject an oversized device packet size\n\nmms114_interrupt() reads a packet of touch data from the device into a\nfixed-size on-stack buffer\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nwhich holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes,\ni.e. 80 bytes. The length of the I2C read into it is taken verbatim from\nthe device:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size <= 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size is a single device register byte (0x0F) and the only check\nis the lower bound packet_size <= 0; it is never bounded against the\nsize of touch[]. A malfunctioning, malicious or counterfeit controller\n(or an attacker tampering with the I2C bus) can report a packet_size of\nup to 255, so __mms114_read_reg() writes up to 175 bytes past the end of\ntouch[] on the IRQ-thread stack: a stack out-of-bounds write that can\noverwrite the stack canary, saved registers and the return address.\n\nA well-formed device never reports more than the buffer holds, so reject\nan oversized packet and drop the report, consistent with the handler's\nother error paths, rather than reading past the buffer.","publishedAt":"2026-07-25T08:49:17.541Z","updatedAt":"2026-08-23T12:45:36.926Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"040843281eebfa110d08fd7fb083fe6cb55cea14","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"39b12daf1adb80f9595fdfe584961deb80860cbb","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"d99ba93c35ff2d5276e9c2632967481bd53a79d0","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"b78150729762d47c14fe29a2582bdca5568e62b8","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"8301c335305344d4da4ab9442b6a399dacfe5b8d","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"f3d5e77b27fded71dcb97f409262bf0abba0410e","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"66725039f7090afe14c31bd259e2059a68f04023","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/mms114.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.6","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/mms114.c"]}],"references":["https://git.kernel.org/stable/c/040843281eebfa110d08fd7fb083fe6cb55cea14","https://git.kernel.org/stable/c/39b12daf1adb80f9595fdfe584961deb80860cbb","https://git.kernel.org/stable/c/d99ba93c35ff2d5276e9c2632967481bd53a79d0","https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6","https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8","https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d","https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e","https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64270.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64270","state":"PUBLISHED","datePublished":"2026-07-25T08:49:17.541Z","dateUpdated":"2026-08-23T12:45:36.926Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.775Z"},"containers":{"cna":{"title":"Input: mms114 - reject an oversized device packet size","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: mms114 - reject an oversized device packet size\n\nmms114_interrupt() reads a packet of touch data from the device into a\nfixed-size on-stack buffer\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nwhich holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes,\ni.e. 80 bytes. The length of the I2C read into it is taken verbatim from\nthe device:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size <= 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size is a single device register byte (0x0F) and the only check\nis the lower bound packet_size <= 0; it is never bounded against the\nsize of touch[]. A malfunctioning, malicious or counterfeit controller\n(or an attacker tampering with the I2C bus) can report a packet_size of\nup to 255, so __mms114_read_reg() writes up to 175 bytes past the end of\ntouch[] on the IRQ-thread stack: a stack out-of-bounds write that can\noverwrite the stack canary, saved registers and the return address.\n\nA well-formed device never reports more than the buffer holds, so reject\nan oversized packet and drop the report, consistent with the handler's\nother error paths, rather than reading past the buffer."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"040843281eebfa110d08fd7fb083fe6cb55cea14","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"39b12daf1adb80f9595fdfe584961deb80860cbb","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"d99ba93c35ff2d5276e9c2632967481bd53a79d0","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"b78150729762d47c14fe29a2582bdca5568e62b8","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"8301c335305344d4da4ab9442b6a399dacfe5b8d","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"f3d5e77b27fded71dcb97f409262bf0abba0410e","versionType":"git"},{"version":"07b8481d4aff73d6f451f25e74ea10240ff5131e","status":"affected","lessThan":"66725039f7090afe14c31bd259e2059a68f04023","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/mms114.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.6","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/mms114.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/040843281eebfa110d08fd7fb083fe6cb55cea14"},{"url":"https://git.kernel.org/stable/c/39b12daf1adb80f9595fdfe584961deb80860cbb"},{"url":"https://git.kernel.org/stable/c/d99ba93c35ff2d5276e9c2632967481bd53a79d0"},{"url":"https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6"},{"url":"https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8"},{"url":"https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d"},{"url":"https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e"},{"url":"https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:45:36.926Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}