{"id":"CVE-2026-64270","summary":"Input: mms114 - reject an oversized device packet size","details":"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 \u003c= 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 \u003c= 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.","modified":"2026-07-27T04:03:21.106097419Z","published":"2026-07-25T08:49:17.541Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64270.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64270.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64270"},{"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":"07b8481d4aff73d6f451f25e74ea10240ff5131e"},{"fixed":"5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6"},{"fixed":"b78150729762d47c14fe29a2582bdca5568e62b8"},{"fixed":"8301c335305344d4da4ab9442b6a399dacfe5b8d"},{"fixed":"f3d5e77b27fded71dcb97f409262bf0abba0410e"},{"fixed":"66725039f7090afe14c31bd259e2059a68f04023"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64270.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.6.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64270.json"}}],"schema_version":"1.7.5"}