{"id":"CVE-2026-64083","summary":"hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] \u003c\u003c 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO.","modified":"2026-07-21T03:46:31.459268032Z","published":"2026-07-19T15:39:54.756Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64083.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64083.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64083"},{"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":"d98dfad35c38c037b37c4adc99df01da571031a5"},{"fixed":"fd9196aad9e5a3845cea17de3405ebc700382142"},{"fixed":"ee4799becf7d2af3778007e22c2e55c4009a49c7"},{"fixed":"c603b6c6840ac0c6285f5eefea0de6242710af21"},{"fixed":"a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"},{"fixed":"ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"},{"fixed":"eb3cd9bb590460c6127145cb245be925d23f5232"},{"fixed":"64fa9328948ddcc0f7f3c23ea1756c126d9dffac"},{"fixed":"a7232f68c43ca62f545049b7f5fbfc75137b843b"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64083.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64083.json"}}],"schema_version":"1.7.5"}