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CVE-2026-89465 (GCVE-0-2026-89465)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
power: supply: rt9455: quiesce delayed work before teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: rt9455: quiesce delayed work before teardown The threaded IRQ handler can queue pwr_rdy_work, max_charging_time_work and batt_presence_work. pwr_rdy_work and batt_presence_work can also queue max_charging_time_work, while batt_presence_work can requeue itself. rt9455_remove() cancels max_charging_time_work before batt_presence_work. The latter can therefore queue max_charging_time_work after it has already been cancelled: rt9455_remove() workqueue cancel pwr_rdy_work cancel max_charging_time_work batt_presence_work queues max_charging_time_work cancel batt_presence_work return devres frees rt9455_info max_charging_time_work dereferences rt9455_info The IRQ also remains registered until devres cleanup and can queue more work after any of the cancellation calls. If rt9455_hw_init() fails after the IRQ has been requested, probe returns without cancelling work that may already have been queued. A pending callback can then access rt9455_info after it has been freed. Register rt9455_cancel_all_delayed_works() through devm_add_action_or_reset() right after devm_power_supply_register(). devres invokes the action in reverse registration order, after the managed IRQ has been freed and before rt9455_info is released, so the delayed works are drained in both rt9455_remove() and the probe error path. Cancel pwr_rdy_work and batt_presence_work before max_charging_time_work because both can queue the latter. This issue was found by an in-house static analysis tool.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e86d69dd786e94046b8f5be7df1b9a8226a40b2a , < 442c60c08ec23ac45da0a58877cab05e0a58f4ea (git)
Affected: e86d69dd786e94046b8f5be7df1b9a8226a40b2a , < df67c7a2fff8414aa766b8cd5ffe11ec1ca27d02 (git)
Affected: e86d69dd786e94046b8f5be7df1b9a8226a40b2a , < 1b9978433c61a9b46e48832a1ebceee1cf5c9eb4 (git)
Affected: e86d69dd786e94046b8f5be7df1b9a8226a40b2a , < 7323e562f6961e4b7bce3225cde4ecbc78260deb (git)
Affected: e86d69dd786e94046b8f5be7df1b9a8226a40b2a , < 3e7a1ebc32fad5a558254a478efd401c17a24381 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 6.6.157 , ≤ 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-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: rt9455: quiesce delayed work before teardown\n\nThe threaded IRQ handler can queue pwr_rdy_work,\nmax_charging_time_work and batt_presence_work.  pwr_rdy_work and\nbatt_presence_work can also queue max_charging_time_work, while\nbatt_presence_work can requeue itself.\n\nrt9455_remove() cancels max_charging_time_work before\nbatt_presence_work.  The latter can therefore queue\nmax_charging_time_work after it has already been cancelled:\n\n  rt9455_remove()                   workqueue\n    cancel pwr_rdy_work\n    cancel max_charging_time_work\n                                      batt_presence_work queues\n                                        max_charging_time_work\n    cancel batt_presence_work\n    return\n    devres frees rt9455_info\n                                      max_charging_time_work dereferences\n                                        rt9455_info\n\nThe IRQ also remains registered until devres cleanup and can queue more\nwork after any of the cancellation calls.  If rt9455_hw_init() fails\nafter the IRQ has been requested, probe returns without cancelling work\nthat may already have been queued.  A pending callback can then access\nrt9455_info after it has been freed.\n\nRegister rt9455_cancel_all_delayed_works() through\ndevm_add_action_or_reset() right after devm_power_supply_register().\ndevres invokes the action in reverse registration order, after the\nmanaged IRQ has been freed and before rt9455_info is released, so the\ndelayed works are drained in both rt9455_remove() and the probe error\npath.  Cancel pwr_rdy_work and batt_presence_work before\nmax_charging_time_work because both can queue the latter.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached only when the I2C RT9455 charger is torn down locally (sysfs unbind, rmmod, or shutdown/reboot) so delayed work runs after rt9455_info is freed; charger IRQs come from the on-chip GPIO, not from any network protocol.\nAC:L - The attacker controls both sides of the race: they start teardown while USB plug/unplug IRQs or already-queued pwr_rdy_work/batt_presence_work (1s/60s, self-requeue) re-arm work after cancel; the delayed callbacks make the UAF window reliable, not layout-dependent.\nPR:N - On battery-powered devices with this IC, brief physical possession is enough to force power-off/reboot with no Linux account while charger IRQs fire during remove, as for the prior RT9455 teardown UAF (CVE-2026-46270); CAP_SYS_ADMIN unbind is only an alternate path.\nUI:N - No victim action is required; the attacker performs teardown and any charging-port manipulation themselves, without the victim opening files, mounting filesystems, or approving prompts.\nS:U - The UAF corrupts kernel heap inside the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Work callbacks container_of() a freed rt9455_info and then read client, regmap, and charger pointers, a classic use-after-free that yields arbitrary kernel reads after heap reuse.\nI:H - The same callbacks write through the freed object (queue_delayed_work, power_supply_changed, regmap_field_write), enabling heap-spray arbitrary writes and control-flow hijack.\nA:H - Use-after-free of driver private data from workqueue context causes a kernel oops or panic even when the UAF is not fully turned into a write primitive."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:00:04.241Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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      "title": "power: supply: rt9455: quiesce delayed work before teardown",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89465",
    "datePublished": "2026-09-11T19:43:25.950Z",
    "dateReserved": "2026-09-11T19:38:34.709Z",
    "dateUpdated": "2026-09-14T12:00:04.241Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-17",
      "epss": "0.00144",
      "percentile": "0.04035"
    },
    "nvd": {
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: rt9455: quiesce delayed work before teardown\n\nThe threaded IRQ handler can queue pwr_rdy_work,\nmax_charging_time_work and batt_presence_work.  pwr_rdy_work and\nbatt_presence_work can also queue max_charging_time_work, while\nbatt_presence_work can requeue itself.\n\nrt9455_remove() cancels max_charging_time_work before\nbatt_presence_work.  The latter can therefore queue\nmax_charging_time_work after it has already been cancelled:\n\n  rt9455_remove()                   workqueue\n    cancel pwr_rdy_work\n    cancel max_charging_time_work\n                                      batt_presence_work queues\n                                        max_charging_time_work\n    cancel batt_presence_work\n    return\n    devres frees rt9455_info\n                                      max_charging_time_work dereferences\n                                        rt9455_info\n\nThe IRQ also remains registered until devres cleanup and can queue more\nwork after any of the cancellation calls.  If rt9455_hw_init() fails\nafter the IRQ has been requested, probe returns without cancelling work\nthat may already have been queued.  A pending callback can then access\nrt9455_info after it has been freed.\n\nRegister rt9455_cancel_all_delayed_works() through\ndevm_add_action_or_reset() right after devm_power_supply_register().\ndevres invokes the action in reverse registration order, after the\nmanaged IRQ has been freed and before rt9455_info is released, so the\ndelayed works are drained in both rt9455_remove() and the probe error\npath.  Cancel pwr_rdy_work and batt_presence_work before\nmax_charging_time_work because both can queue the latter.\n\nThis issue was found by an in-house static analysis tool."
          }
        ],
        "id": "CVE-2026-89465",
        "lastModified": "2026-09-14T13:19:02.870",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          },
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            "url": "https://git.kernel.org/stable/c/df67c7a2fff8414aa766b8cd5ffe11ec1ca27d02"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-17T20:02:29+00:00",
      "cve": "CVE-2026-89465",
      "id": "CVE-2026-89465",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: power: supply: rt9455: quiesce delayed work before teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89465.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:03:26Z",
      "cve": "CVE-2026-89465",
      "id": "CVE-2026-89465",
      "initial_release_date": "2026-09-16T00:03:26Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89465",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89465.json",
      "version": "2"
    }
  }
}



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