CVE-2026-99050

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: gpio: mpsse: fix race when arming the IRQ poll worker gpio_mpsse_irq_enable() arms the poll worker before publishing it: schedule_work() runs before the worker is added to priv->workers. If gpio_mpsse_disconnect() walks the list in that window it misses the worker, and once disconnect returns, the USB core frees mpsse_priv while the orphaned gpio_mpsse_poll() work keeps accessing it, causing a use-after-free. Fix this by publishing and arming the worker in one irq_spin critical section. Teardown walks the same list under irq_spin, so a worker found on the list is guaranteed to be armed, and cancel_work_sync() handles it whether it is queued or running. A worker armed after the disconnect walk would still be missed, so also set a new priv->dying flag under irq_spin before the teardown walk, and check it in the same critical section, freeing it via kfree_rcu() instead when the device is going away, since kfree() would be called with the IRQ core's raw spinlock held and may sleep on PREEMPT_RT. schedule_work() is safe to call with irq_spin held, and the next probe gets a fresh mpsse_priv, so the flag never needs to be cleared. This issue was found by an in-house static analysis tool.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 13:17:28.513000

Last modified

2026-10-24 14:16:53.637000

View original CVE JSON

{
  "id": "CVE-2026-99050",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T13:17:28.513",
  "lastModified": "2026-10-24T14:16:53.637",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: mpsse: fix race when arming the IRQ poll worker\n\ngpio_mpsse_irq_enable() arms the poll worker before publishing it:\nschedule_work() runs before the worker is added to priv->workers. If\ngpio_mpsse_disconnect() walks the list in that window it misses the\nworker, and once disconnect returns, the USB core frees mpsse_priv\nwhile the orphaned gpio_mpsse_poll() work keeps accessing it, causing\na use-after-free.\n\nFix this by publishing and arming the worker in one irq_spin\ncritical section. Teardown walks the same list under irq_spin, so a\nworker found on the list is guaranteed to be armed, and\ncancel_work_sync() handles it whether it is queued or running.\n\nA worker armed after the disconnect walk would still be missed, so\nalso set a new priv->dying flag under irq_spin before the teardown\nwalk, and check it in the same critical section, freeing it via\nkfree_rcu() instead when the device is going away, since kfree()\nwould be called with the IRQ core's raw spinlock held and may sleep\non PREEMPT_RT. schedule_work() is safe to call with irq_spin held,\nand the next probe gets a fresh mpsse_priv, so the flag never needs\nto be cleared.\n\nThis issue was found by an in-house static analysis tool."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/gpio/gpio-mpsse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "472d900c8bcac301ae0e40fdca7db799bd989ff5",
              "lessThan": "76390ac0bca7e5058b7482eb4d951c3bda5df812",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "179ef1127d7a4f09f0e741fa9f30b8a8e7886271",
              "lessThan": "c0071ee496e1228976c72b096f529503222708a0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "179ef1127d7a4f09f0e741fa9f30b8a8e7886271",
              "lessThan": "7efa1a1953cd6b20b23a3524d5b4b81789c6ef25",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.18.6",
              "lessThan": "6.18.57",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/gpio/gpio-mpsse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.19",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.11",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "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",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/76390ac0bca7e5058b7482eb4d951c3bda5df812",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7efa1a1953cd6b20b23a3524d5b4b81789c6ef25",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c0071ee496e1228976c72b096f529503222708a0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}