CVE-2026-89472 (GCVE-0-2026-89472)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-10-30 12:31
VLAI
Title
power: supply: charger-manager: register regulators before exposing sysfs
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: charger-manager: register regulators before exposing sysfs charger_manager_remove() and the err_reg_extcon probe error path free each charger regulator with regulator_put() before tearing down the power_supply sysfs entries (power_supply_unregister()). charger_manager_remove() also calls try_charger_enable(cm, false) after the regulator_put() loop. A concurrent write to a charger's externally_control sysfs attribute that lands between regulator_put() and power_supply_unregister() can run charger_externally_control_store() and call try_charger_enable(), which, when charging is enabled, dereferences the already-freed consumer handle. When charging is enabled, try_charger_enable(cm, false) in .remove() also dereferences the freed handles directly. Both leave use-after-free windows. Symmetrically, probe registers the sysfs entries (power_supply_register) before acquiring the regulators (regulator_get, inside charger_manager_register_extcon), so userspace can reach externally_control before the regulators are available. Split charger_manager_register_extcon() on the sync/async boundary: charger_manager_get_regulators() (regulator_get only, no async producer) now runs before power_supply_register() so sysfs is not live before regulators are available, and charger_manager_register_extcon() keeps only the extcon notifier/work setup, still after power_supply_register() so a power_supply_register() failure cannot reach extcon setup. This keeps the sysfs setup/teardown ordering symmetric without introducing an asynchronous producer on the earlier probe-error path. Move power_supply_unregister() and try_charger_enable(cm, false) ahead of the regulator_put() loop on both teardown paths, and adjust err_reg_extcon (power_supply_unregister() then fall through err_regulator for regulator_put(); get_regulators self-rolls back on its own failure). This does not address the separate extcon-notifier-driven deref of the same handles, which needs its own synchronization design. Found by an in-house static analysis tool.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < 5763750916d28a29f1375a14dd6dadd5f2d2e178 (git)
Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < 6e1645a6ee85d070c2d8dd847f1ce110dc2455c1 (git)
Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < af3ce383ba0d0d48957a22ac7058ff5698775898 (git)
Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < 86e4fa65368f3bbb506dddba8c9eedc75bd603b2 (git)
Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < 6d532582ff3c420598f02945b13184c738cc1581 (git)
Affected: 3950c7865cd7c963982a2c94457182b96732f4c9 , < c57cb36f76eb7ced45f57af1a890d8f3a6d76342 (git)
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Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "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\u0027s 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."
        }
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            "version": "3.1"
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              "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."
            }
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      "title": "power: supply: charger-manager: register regulators before exposing sysfs",
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    "datePublished": "2026-09-11T19:43:30.536Z",
    "dateReserved": "2026-09-11T19:38:34.710Z",
    "dateUpdated": "2026-10-30T12:31:50.628Z",
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      "source": "Microsoft CSAF VEX",
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      "title": "power: supply: charger-manager: register regulators before exposing sysfs",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89472.json",
      "version": "4"
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        "cveTags": [],
        "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\u0027s 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."
          }
        ],
        "id": "CVE-2026-89472",
        "lastModified": "2026-10-30T13:20:17.203",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-11T20:19:28.393",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5763750916d28a29f1375a14dd6dadd5f2d2e178"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6d532582ff3c420598f02945b13184c738cc1581"
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          },
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            "url": "https://git.kernel.org/stable/c/86e4fa65368f3bbb506dddba8c9eedc75bd603b2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/af3ce383ba0d0d48957a22ac7058ff5698775898"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c57cb36f76eb7ced45f57af1a890d8f3a6d76342"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:15:42+00:00",
      "cve": "CVE-2026-89472",
      "id": "CVE-2026-89472",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "202",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: power: supply: charger-manager: register regulators before exposing sysfs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89472.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.