CVE-2026-89769 (GCVE-0-2026-89769)
Vulnerability from cvelistv5
Published
2026-09-11 19:47
Modified
2026-10-19 08:52
Severity ?
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path When cpuhp_setup_state fails after pit_clockevent_per_cpu_init has successfully called request_irq, the error handling jumps directly to out_pit_clocksource_unregister without freeing the registered IRQ. This leaks the IRQ line and, since kfree(pit) follows, leaves a dangling pointer registered as the interrupt handler's dev_id, potentially leading to a use-after-free if the IRQ fires afterwards. Fix it by calling pit_clockevent_per_cpu_exit to properly release the IRQ before falling through to the existing cleanup chain.
References
Impacted products
Vendor Product Version
Linux Linux Version: bee33f22d7c30626e711b4900e3f460b6e0e104f
Version: bee33f22d7c30626e711b4900e3f460b6e0e104f
Version: bee33f22d7c30626e711b4900e3f460b6e0e104f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/clocksource/timer-nxp-pit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d53c29a89a15e56a1797f3ef249955e544782e04",
              "status": "affected",
              "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f",
              "versionType": "git"
            },
            {
              "lessThan": "cdcd861123248e871c2ec2be968b0a1b2a5a34b0",
              "status": "affected",
              "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f",
              "versionType": "git"
            },
            {
              "lessThan": "05520e035f8332c8e33f3011b5ca016fde61793d",
              "status": "affected",
              "version": "bee33f22d7c30626e711b4900e3f460b6e0e104f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/clocksource/timer-nxp-pit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027s 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": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027d 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 \u0026pit-\u003eced 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-\u003eevent_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:22.773Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89769",
    "datePublished": "2026-09-11T19:47:08.870Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-10-19T08:52:22.773Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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