Vulnerability-Lookup

GHSA-77G9-3GMV-7P3Q

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-24 15:32

Details

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

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99050"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:28Z",
    "severity": "HIGH"
  },
  "details": "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-\u003eworkers. 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-\u003edying 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\u0027s 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.",
  "id": "GHSA-77g9-3gmv-7p3q",
  "modified": "2026-10-24T15:32:50Z",
  "published": "2026-10-23T15:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99050"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76390ac0bca7e5058b7482eb4d951c3bda5df812"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7efa1a1953cd6b20b23a3524d5b4b81789c6ef25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0071ee496e1228976c72b096f529503222708a0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-99050 (GCVE-0-2026-99050)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:22 – Updated: 2026-10-24 14:10

Title

gpio: mpsse: fix race when arming the IRQ poll worker

Summary

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

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/76390ac0bca7e5058…
https://git.kernel.org/stable/c/c0071ee496e122897…
https://git.kernel.org/stable/c/7efa1a1953cd6b20b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 472d900c8bcac301ae0e40fdca7db799bd989ff5 , < 76390ac0bca7e5058b7482eb4d951c3bda5df812 (git) Affected: 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 , < c0071ee496e1228976c72b096f529503222708a0 (git) Affected: 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 , < 7efa1a1953cd6b20b23a3524d5b4b81789c6ef25 (git) Affected: 6.18.6 , < 6.18.57 (semver)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-mpsse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "76390ac0bca7e5058b7482eb4d951c3bda5df812",
              "status": "affected",
              "version": "472d900c8bcac301ae0e40fdca7db799bd989ff5",
              "versionType": "git"
            },
            {
              "lessThan": "c0071ee496e1228976c72b096f529503222708a0",
              "status": "affected",
              "version": "179ef1127d7a4f09f0e741fa9f30b8a8e7886271",
              "versionType": "git"
            },
            {
              "lessThan": "7efa1a1953cd6b20b23a3524d5b4b81789c6ef25",
              "status": "affected",
              "version": "179ef1127d7a4f09f0e741fa9f30b8a8e7886271",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.57",
              "status": "affected",
              "version": "6.18.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-mpsse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "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": "6.18.57",
                  "versionStartIncluding": "6.18.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003eworkers. 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-\u003edying 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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - A local process can race GPIO_V2_GET_LINE_IOCTL -\u003e linereq_create() -\u003e edge_detector_setup() -\u003e request_threaded_irq() -\u003e gpio_mpsse_irq_enable() against USBDEVFS_IOCTL/USBDEVFS_DISCONNECT -\u003e usb_driver_release_interface() -\u003e gpio_mpsse_disconnect(); no network input reaches the bug.\nAC:L - The attacker can issue the GPIO line-event request and USBFS unbind concurrently and repeat after rebinding; both sides of the schedule_work()-before-list_add() window are attacker-controlled.\nPR:L - Neither gpio_ioctl() nor the USBDEVFS_DISCONNECT path performs a capability check; the process only needs non-root DAC/ACL access to /dev/gpiochipN and writable access to the matching /dev/bus/usb node.\nUI:N - The same process submits the line-event and USB disconnect ioctls that create the race, so no action by another user is required.\nS:U - The freed mpsse_priv and orphaned gpio_mpsse_poll() worker are both in the host kernel; the path crosses no VM, IOMMU, or other security authority.\nC:H - gpio_mpsse_poll() continues through attacker-reclaimable mpsse_priv fields, including GPIO, IRQ-domain, USB-buffer, and interface pointers; the resulting UAF and write primitive can yield kernel code execution and unrestricted reads.\nI:H - gpio_mpsse_poll() locks and traverses priv-\u003eworkers after priv is freed; reclaiming that allocation lets controlled list pointers reach list_del(), providing attacker-directed kernel writes and control-flow corruption.\nA:H - The orphaned gpio_mpsse_poll() can access freed mutex, spinlock, and list state, or use the NULL/stale priv-\u003eintf in MPSSE I/O, causing an oops or kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:10:11.370Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76390ac0bca7e5058b7482eb4d951c3bda5df812"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0071ee496e1228976c72b096f529503222708a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/7efa1a1953cd6b20b23a3524d5b4b81789c6ef25"
        }
      ],
      "title": "gpio: mpsse: fix race when arming the IRQ poll worker",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99050",
    "datePublished": "2026-10-23T12:22:29.204Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
    "dateUpdated": "2026-10-24T14:10:11.370Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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