{"id":"CVE-2025-38086","title":"net: ch9200: fix uninitialised access during mii_nway_restart","summary":"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->mdio_read which is ch9200_mdio_read(). ch9200_mdio_r…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 119766de4930ff40db9f36b960cb53b0c400e81b","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9da3e442714f7f4393ff01c265c4959c03e88c2f","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9a350f30d65197354706b7759b5c89d6c267b1a9","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 6bd2569d0b2f918e9581f744df0263caf73ee76c","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 4da7fcc098218ff92b2e83a43f545c02f714cedd","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72","Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9ad0452c0277b816a435433cca601304cfac7c21","Linux 4.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:49:18.243571Z"},"published":"2025-06-28","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:52:15.111Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38086","references":[{"url":"https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b"},{"url":"https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2"},{"url":"https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f"},{"url":"https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9"},{"url":"https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c"},{"url":"https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd"},{"url":"https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72"},{"url":"https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21"}],"tags":["cve.org"],"epss":0.00206,"epssPercentile":0.10679,"ingestedAt":"2026-11-05T22:38:31.916Z","slug":"CVE-2025-38086","body":"## Overview\n\nIn 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->mdio_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] << 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.\n\n## Affected\n\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 119766de4930ff40db9f36b960cb53b0c400e81b`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9da3e442714f7f4393ff01c265c4959c03e88c2f`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9a350f30d65197354706b7759b5c89d6c267b1a9`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 6bd2569d0b2f918e9581f744df0263caf73ee76c`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 4da7fcc098218ff92b2e83a43f545c02f714cedd`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72`\n- `Linux >= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9ad0452c0277b816a435433cca601304cfac7c21`\n- `Linux 4.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}