{"id":"CVE-2023-53166","summary":"power: supply: bq25890: Fix external_power_changed race","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: bq25890: Fix external_power_changed race\n\nbq25890_charger_external_power_changed() dereferences bq-\u003echarger,\nwhich gets sets in bq25890_power_supply_init() like this:\n\n  bq-\u003echarger = devm_power_supply_register(bq-\u003edev, &bq-\u003edesc, &psy_cfg);\n\nAs soon as devm_power_supply_register() has called device_add()\nthe external_power_changed callback can get called. So there is a window\nwhere bq25890_charger_external_power_changed() may get called while\nbq-\u003echarger has not been set yet leading to a NULL pointer dereference.\n\nThis race hits during boot sometimes on a Lenovo Yoga Book 1 yb1-x90f\nwhen the cht_wcove_pwrsrc (extcon) power_supply is done with detecting\nthe connected charger-type which happens to exactly hit the small window:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  \u003csnip\u003e\n  RIP: 0010:__power_supply_is_supplied_by+0xb/0xb0\n  \u003csnip\u003e\n  Call Trace:\n   \u003cTASK\u003e\n   __power_supply_get_supplier_property+0x19/0x50\n   class_for_each_device+0xb1/0xe0\n   power_supply_get_property_from_supplier+0x2e/0x50\n   bq25890_charger_external_power_changed+0x38/0x1b0 [bq25890_charger]\n   __power_supply_changed_work+0x30/0x40\n   class_for_each_device+0xb1/0xe0\n   power_supply_changed_work+0x5f/0xe0\n  \u003csnip\u003e\n\nFixing this is easy. The external_power_changed callback gets passed\nthe power_supply which will eventually get stored in bq-\u003echarger,\nso bq25890_charger_external_power_changed() can simply directly use\nthe passed in psy argument which is always valid.","modified":"2026-04-02T09:43:43.937787Z","published":"2025-09-15T14:03:55.131Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53166.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/029a443b9b6424170f00f6dd5b7682e682cce92e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72c28207c19c2c46fab8ae994aff25e197fb2949"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d20fa1982c35697f3f8c4ae0f12791691ae5958"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53166.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53166"},{"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":"eab25b4f93aa771728127705eb4b235a3b5aad94"},{"fixed":"72c28207c19c2c46fab8ae994aff25e197fb2949"},{"fixed":"9d20fa1982c35697f3f8c4ae0f12791691ae5958"},{"fixed":"029a443b9b6424170f00f6dd5b7682e682cce92e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53166.json"}}],"schema_version":"1.7.5"}