{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89769", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.765Z", "datePublished": "2026-09-11T19:47:08.870Z", "dateUpdated": "2026-10-19T08:52:22.773Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:52:22.773Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path\n\nWhen cpuhp_setup_state fails after pit_clockevent_per_cpu_init has\nsuccessfully called request_irq, the error handling jumps directly to\nout_pit_clocksource_unregister without freeing the registered IRQ.\n\nThis leaks the IRQ line and, since kfree(pit) follows, leaves a\ndangling pointer registered as the interrupt handler's dev_id,\npotentially leading to a use-after-free if the IRQ fires afterwards.\n\nFix it by calling pit_clockevent_per_cpu_exit to properly release the\nIRQ before falling through to the existing cleanup chain." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is in pit_timer_init() of the NXP PIT clocksource driver (S32G2/S32G3 automotive SoCs and Vybrid vf610), reached only via local device-tree platform/timer probe at boot. Network, Bluetooth, USB, or other remote paths cannot reach this cpuhp error path.\nAC:H - The dangling IRQ action is planted only when cpuhp_setup_state() fails after request_irq() (dynamic CPUHP slot exhaustion or irq_force_affinity failure). Those resource/hotplug failures, and a later interrupt on the already-disabled PIT line, are conditions the attacker cannot reliably induce.\nPR:N - pit_timer_probe() and TIMER_OF_DECLARE pit_timer_init() run automatically from kernel timer/platform init on matching device-tree nodes, with no credential, capability, or authentication check before request_irq() and the cpuhp error path.\nUI:N - No victim action such as mounting a filesystem, opening a device, or plugging hardware is required. The leaky cleanup runs during unattended probe, and a later PIT IRQ or sched_clock read can consume the dangling state without another user.\nS:U - The leaked IRQ handler and kfree'd pit_timer object remain in the host kernel on the same S32G/Vybrid Linux instance. This is standard in-kernel use-after-free, not a VM escape, IOMMU bypass, or cross-OS partition breakout.\nC:H - On the cpuhp failure path the driver kfree()s pit while pit_timer_interrupt remains registered with &pit->ced as dev_id, a use-after-free that per kernel CNA guidance enables arbitrary kernel memory disclosure via slab reuse.\nI:H - The same dangling ISR invokes ced->event_handler on the freed clock_event_device; reclaiming that heap object yields a function-pointer hijack and arbitrary-write primitive consistent with kernel UAF scoring.\nA:H - An IRQ hitting pit_timer_interrupt after kfree, irq_dispose_mapping of a still-requested line, or sched_clock reads of iounmapped PIT MMIO can oops or panic the kernel, fully denying availability on affected automotive and embedded systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/clocksource/timer-nxp-pit.c" ], "versions": [ { "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f", "lessThan": "d53c29a89a15e56a1797f3ef249955e544782e04", "status": "affected", "versionType": "git" }, { "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f", "lessThan": "cdcd861123248e871c2ec2be968b0a1b2a5a34b0", "status": "affected", "versionType": "git" }, { "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f", "lessThan": "05520e035f8332c8e33f3011b5ca016fde61793d", "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/clocksource/timer-nxp-pit.c" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "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": "6.18", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d53c29a89a15e56a1797f3ef249955e544782e04" }, { "url": "https://git.kernel.org/stable/c/cdcd861123248e871c2ec2be968b0a1b2a5a34b0" }, { "url": "https://git.kernel.org/stable/c/05520e035f8332c8e33f3011b5ca016fde61793d" } ], "title": "clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path", "x_generator": { "engine": "bippy-1.2.0" } } } }