{"id":"CVE-2025-38086","summary":"net: ch9200: fix uninitialised access during mii_nway_restart","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ch9200: fix uninitialised access during mii_nway_restart\n\nIn mii_nway_restart() the code attempts to call\nmii-\u003emdio_read which is ch9200_mdio_read(). ch9200_mdio_read()\nutilises a local buffer called \"buff\", which is initialised\nwith control_read(). However \"buff\" is conditionally\ninitialised inside control_read():\n\n        if (err == size) {\n                memcpy(data, buf, size);\n        }\n\nIf the condition of \"err == size\" is not met, then\n\"buff\" remains uninitialised. Once this happens the\nuninitialised \"buff\" is accessed and returned during\nch9200_mdio_read():\n\n        return (buff[0] | buff[1] \u003c\u003c 8);\n\nThe problem stems from the fact that ch9200_mdio_read()\nignores the return value of control_read(), leading to\nuinit-access of \"buff\".\n\nTo fix this we should check the return value of\ncontrol_read() and return early on error.","modified":"2026-04-16T04:31:23.672954070Z","published":"2025-06-28T07:52:58.293Z","related":["ALSA-2025:11455","ALSA-2025:11456","ALSA-2025:11861","ALSA-2025:12662"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38086.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38086.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38086"},{"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":"4a476bd6d1d923922ec950ddc4c27b279f6901eb"},{"fixed":"119766de4930ff40db9f36b960cb53b0c400e81b"},{"fixed":"33163c68d2e3061fa3935b5f0a1867958b1cdbd2"},{"fixed":"9da3e442714f7f4393ff01c265c4959c03e88c2f"},{"fixed":"9a350f30d65197354706b7759b5c89d6c267b1a9"},{"fixed":"6bd2569d0b2f918e9581f744df0263caf73ee76c"},{"fixed":"4da7fcc098218ff92b2e83a43f545c02f714cedd"},{"fixed":"cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72"},{"fixed":"9ad0452c0277b816a435433cca601304cfac7c21"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38086.json"}}],"schema_version":"1.7.5"}