{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89472", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.710Z", "datePublished": "2026-09-11T19:43:30.536Z", "dateUpdated": "2026-10-19T08:47:21.279Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:21.279Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: charger-manager: register regulators before exposing sysfs\n\ncharger_manager_remove() and the err_reg_extcon probe error path free each\ncharger regulator with regulator_put() before tearing down the power_supply\nsysfs entries (power_supply_unregister()). charger_manager_remove() also\ncalls try_charger_enable(cm, false) after the regulator_put() loop. A\nconcurrent write to a charger's externally_control sysfs attribute that\nlands between regulator_put() and power_supply_unregister() can run\ncharger_externally_control_store() and call try_charger_enable(), which,\nwhen charging is enabled, dereferences the already-freed consumer handle.\nWhen charging is enabled, try_charger_enable(cm, false) in .remove() also\ndereferences the freed handles directly. Both leave use-after-free windows.\nSymmetrically, probe registers the sysfs entries (power_supply_register)\nbefore acquiring the regulators (regulator_get, inside\ncharger_manager_register_extcon), so userspace can reach externally_control\nbefore the regulators are available.\n\nSplit charger_manager_register_extcon() on the sync/async boundary:\ncharger_manager_get_regulators() (regulator_get only, no async producer)\nnow runs before power_supply_register() so sysfs is not live before\nregulators are available, and charger_manager_register_extcon() keeps only\nthe extcon notifier/work setup, still after power_supply_register() so a\npower_supply_register() failure cannot reach extcon setup. This keeps the\nsysfs setup/teardown ordering symmetric without introducing an asynchronous\nproducer on the earlier probe-error path.\n\nMove power_supply_unregister() and try_charger_enable(cm, false) ahead of\nthe regulator_put() loop on both teardown paths, and adjust err_reg_extcon\n(power_supply_unregister() then fall through err_regulator for\nregulator_put(); get_regulators self-rolls back on its own failure).\n\nThis does not address the separate extcon-notifier-driven deref of the same\nhandles, which needs its own synchronization design.\n\nFound by an in-house static analysis tool." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is reached via local sysfs under /sys/class/power_supply/*/charger.N/{state,externally_control} and via charger_manager_remove()/probe unwind on the charger-manager platform device; this power-supply driver has no network, Bluetooth, or remote packet path into try_charger_enable() or the sysfs handlers.\nAC:L - An attacker can hammer the live sysfs attributes while teardown or probe unwind runs, controlling the sysfs side of the race; charger_manager_remove() also deterministically calls try_charger_enable() on already-freed regulator consumers when charging is enabled, with no attacker-uncontrollable memory layout required.\nPR:L - charger.N/state is mode 0444 and charger_state_show() calls regulator_is_enabled() on the consumer, so an unprivileged local user (including apps on charger-manager phones/embedded devices) can hit the UAF during the teardown or probe window; per driver-removal UAF precedent this is PR:L even though sysfs unbind itself is privileged.\nUI:N - The attacker performs their own sysfs reads or writes against the charger-manager power_supply attributes and can race driver unbind or probe; no separate victim action such as mounting a filesystem or confirming a prompt is required.\nS:U - The dangling struct regulator is kernel heap used by the same host kernel; this is a standard in-kernel use-after-free/privilege-escalation within one security authority, not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - regulator_put() kfree()s the struct regulator while charger_state_show() and try_charger_enable() still dereference the consumer; this heap UAF lets a reused object be read through regulator_is_enabled() and related helpers, enabling arbitrary kernel information disclosure.\nI:H - The same dangling consumer is passed to regulator_enable(), regulator_disable(), and regulator_force_disable() from try_charger_enable() and charger_externally_control_store(), so a sprayed heap object can turn the UAF into arbitrary writes and control-flow hijack.\nA:H - Use of the freed or still-NULL regulator consumer oopses or panics the kernel in regulator_is_enabled()/enable()/disable(), and the UAF crashes even when it is not fully converted into a read/write primitive." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/power/supply/charger-manager.c" ], "versions": [ { "version": "3950c7865cd7c963982a2c94457182b96732f4c9", "lessThan": "af3ce383ba0d0d48957a22ac7058ff5698775898", "status": "affected", "versionType": "git" }, { "version": "3950c7865cd7c963982a2c94457182b96732f4c9", "lessThan": "86e4fa65368f3bbb506dddba8c9eedc75bd603b2", "status": "affected", "versionType": "git" }, { "version": "3950c7865cd7c963982a2c94457182b96732f4c9", "lessThan": "6d532582ff3c420598f02945b13184c738cc1581", "status": "affected", "versionType": "git" }, { "version": "3950c7865cd7c963982a2c94457182b96732f4c9", "lessThan": "c57cb36f76eb7ced45f57af1a890d8f3a6d76342", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/power/supply/charger-manager.c" ], "versions": [ { "version": "3.7", "status": "affected" }, { "version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/af3ce383ba0d0d48957a22ac7058ff5698775898" }, { "url": "https://git.kernel.org/stable/c/86e4fa65368f3bbb506dddba8c9eedc75bd603b2" }, { "url": "https://git.kernel.org/stable/c/6d532582ff3c420598f02945b13184c738cc1581" }, { "url": "https://git.kernel.org/stable/c/c57cb36f76eb7ced45f57af1a890d8f3a6d76342" } ], "title": "power: supply: charger-manager: register regulators before exposing sysfs", "x_generator": { "engine": "bippy-1.2.0" } } } }