{"id":"CVE-2026-45865","summary":"mctp i2c: initialise event handler read bytes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmctp i2c: initialise event handler read bytes\n\nSet a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads\nwill return \"val\" from the i2c bus driver. For i2c-aspeed and\ni2c-npcm7xx that is a stack uninitialised u8.\n\nTested with \"i2ctransfer -y 1 r10@0x34\" where 0x34 is a mctp-i2c\ninstance, now it returns all 0xff.","modified":"2026-06-27T11:55:25.096150290Z","published":"2026-05-27T12:15:45.082Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45865.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45865.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45865"},{"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":"f5b8abf9fc3dacd7529d363e26fe8230935d65f8"},{"fixed":"93e01e837e105299f1c259ef71f6e1ec4fe806e3"},{"fixed":"11f83253244060b5de5eac787f61ae3f3e559d01"},{"fixed":"fa9861e5c8af7651dddfa8d490aaada17ae33b6c"},{"fixed":"6ff2ebfef75fbc57d937d8fbe738b967edf2d331"},{"fixed":"1eeedb310229bfee9dd4d992e5bba33fe1378a8f"},{"fixed":"2a14e91b6d76639dac70ea170f4384c1ee3cb48d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45865.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.0"},{"fixed":"6.1.165"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.128"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-45865.json"}}],"schema_version":"1.7.5"}