{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89938", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.776Z", "datePublished": "2026-09-16T10:32:27.012Z", "dateUpdated": "2026-10-19T08:55:12.734Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:55:12.734Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF\n\nThe atlas driver requests its hardware data-ready IRQ with\ndevm_request_threaded_irq(); its threaded handler queues an irq_work,\natlas_work_handler(), that calls iio_trigger_poll(data->trig).\n\nThe IRQ is devm-managed, so free_irq() runs from the devres unwind after\natlas_remove() returns without flushing that irq_work. Once a buffer is\nenabled, conversion-complete IRQs keep firing and queueing it; a pending\nirq_work can therefore run after the unwind has freed atlas_data/indio_dev\nand the trigger, when atlas_work_handler() derives the atlas_data pointer\nvia container_of() and dereferences data->trig, a use-after-free.\n\nCall iio_trigger_poll_nested() directly from the threaded handler instead\nof bouncing through irq_work. free_irq() then drains the threaded handler,\nclosing the window; other iio drivers with a threaded data-ready IRQ do the\nsame (e.g. bmi270).\n\nThis issue was found 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 use-after-free is reached from local IIO sysfs/chardev buffer enable on the Atlas I2C chemical sensor plus driver teardown (sysfs unbind, rmmod, or parent adapter removal). There is no network, Bluetooth, or remote-protocol path into atlas_interrupt_handler or atlas_work_handler.\nAC:L - With the IIO buffer enabled, conversion-complete IRQs keep queueing irq_work every 450-650ms. atlas_remove() never calls irq_work_sync(), so pending work runs after the synchronous devres unwind frees atlas_data. The attacker controls buffer enable and bind/unbind retries; on PREEMPT_RT or CPUs without an irq_work IPI the window is milliseconds.\nPR:L - IIO buffer/enable is mode 0644 with no capability check, and on industrial/IoT water-quality systems that ship Atlas OEM SM sensors those nodes are commonly group-accessible to monitoring services. Per driver-removal UAF scoring, an unprivileged local user can drive the IRQ/irq_work side while teardown proceeds; init-namespace root is not required.\nUI:N - The attacker enables the IIO buffer themselves and coordinates driver unbind or module teardown; no separate victim action such as plugging hardware or mounting a filesystem is required.\nS:U - The use-after-free corrupts kernel heap objects (atlas_data and the IIO trigger) in the host kernel's own security authority. This is a standard local kernel privilege-escalation path, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - atlas_work_handler() recovers freed atlas_data via container_of() and dereferences data->trig. A use-after-free of that sprayable driver-private object yields an arbitrary kernel read primitive, including via iio_trigger_poll() walking attacker-controlled trigger state.\nI:H - After spraying the freed atlas_data, data->trig is attacker-controlled, so iio_trigger_poll() performs atomic updates and generic_handle_irq() on attacker-chosen IRQ numbers. That is an arbitrary kernel write and control-flow hijack primitive, consistent with use-after-free scoring.\nA:H - The pending irq_work running against freed atlas_data and the IIO trigger causes a kernel oops or panic (KASAN use-after-free or a wild dereference of data->trig), so availability impact is high even without a full exploit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iio/chemical/atlas-sensor.c" ], "versions": [ { "version": "7103b99b031cb0ff6979331757bfc4893f37ae9e", "lessThan": "f64b437641b5a70c18bb0fd38da2b69d8926c871", "status": "affected", "versionType": "git" }, { "version": "7103b99b031cb0ff6979331757bfc4893f37ae9e", "lessThan": "91e12b0fbd7047d02bf4ef4dbc491b9ef0159250", "status": "affected", "versionType": "git" }, { "version": "7103b99b031cb0ff6979331757bfc4893f37ae9e", "lessThan": "2071624c3d0f497ca91da78858e6f30d7112fea6", "status": "affected", "versionType": "git" }, { "version": "7103b99b031cb0ff6979331757bfc4893f37ae9e", "lessThan": "30b0d44c978bbc857bd68b71dab371805653de70", "status": "affected", "versionType": "git" }, { "version": "7103b99b031cb0ff6979331757bfc4893f37ae9e", "lessThan": "be61c8c6252671ecf1fee0ad90f87669e0be1e20", "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/iio/chemical/atlas-sensor.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "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": "4.8", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f64b437641b5a70c18bb0fd38da2b69d8926c871" }, { "url": "https://git.kernel.org/stable/c/91e12b0fbd7047d02bf4ef4dbc491b9ef0159250" }, { "url": "https://git.kernel.org/stable/c/2071624c3d0f497ca91da78858e6f30d7112fea6" }, { "url": "https://git.kernel.org/stable/c/30b0d44c978bbc857bd68b71dab371805653de70" }, { "url": "https://git.kernel.org/stable/c/be61c8c6252671ecf1fee0ad90f87669e0be1e20" } ], "title": "iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF", "x_generator": { "engine": "bippy-1.2.0" } } } }