{"id":"CVE-2026-64085","summary":"hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer\n\nadm1266_pmbus_block_xfer() copies the device-supplied block payload\ninto the caller-provided buffer using the device-supplied length:\n\n\tmemcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);\n\nThe helper does not know how large data_r is and trusts the device to\nreturn at most one record's worth of bytes.  adm1266_nvmem_read_blackbox()\nviolates that contract: it advances read_buff inside data-\u003edev_mem in\nADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to\nwrite up to ADM1266_PMBUS_BLOCK_MAX (255) bytes.  A device that returns\nmore than 64 bytes on the trailing record (read_buff offset 1984 in\nthe 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes\nbefore the post-call\n\n\tif (ret != ADM1266_BLACKBOX_SIZE)\n\t\treturn -EIO;\n\ncan reject the response.\n\nContain the fix in the caller without changing the helper signature:\nread each record into a 255-byte local bounce buffer that matches the\nhelper's maximum output, validate the returned length, and only then\ncopy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.","modified":"2026-07-21T03:47:49.666358888Z","published":"2026-07-19T15:39:56.067Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64085.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64085.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64085"},{"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":"407dc802a9c0809ca6a48de4b4c63305eb84ef56"},{"fixed":"7896d87cbb05e097efc113243d4e38f9f8cea16c"},{"fixed":"9d5309500b4607b7198e19f0a3fa13eb864cd5fb"},{"fixed":"6098634cfa711f11a8d65368dc51ec8f7c8241ba"},{"fixed":"60c4b9fe1a3dd012014b1f561a6928a0b5db1126"},{"fixed":"83e039f0a43e0708515b0479cb7690fb93faaaa0"},{"fixed":"97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f"},{"fixed":"dd47b8c4a0a8ced442da3f008db28fbbd31feaf0"},{"fixed":"43cae21424ff8e33894a0f86c6b80b840c049fd7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64085.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-2026-64085.json"}}],"schema_version":"1.7.5"}