FKIE_CVE-2026-64428

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: sch: use raw_spinlock_t in the irq startup path sch_irq_unmask() enables the GPIO IRQ and then updates the controller state through sch_irq_mask_unmask(), which takes sch->lock with spin_lock_irqsave(). The callback can be reached from irq_startup() while setting up a requested IRQ. That path is not sleepable, but on PREEMPT_RT a regular spinlock_t becomes a sleeping lock. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the request_threaded_irq() -> __setup_irq() -> irq_startup() -> sch_irq_unmask() -> sch_irq_mask_unmask() carrier and used the original spin_lock_irqsave(&sch->lock) edge. Lockdep reported: BUG: sleeping function called from invalid context hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv] sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv] sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv] __setup_irq.constprop.0+0xd/0x30 [vuln_msv] Convert the SCH controller lock to raw_spinlock_t. The same lock is also used by the GPIO direction and value callbacks, but those critical sections only update MMIO-backed GPIO registers and do not contain sleepable operations. Keeping this register lock non-sleeping is therefore appropriate for the irqchip callbacks and does not change the GPIO-side locking contract.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41cad91a09d69e8fff4e936db29b1054b4e9f9f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4508366ab7dd0c2917a51a9c2e23cc1b9d35157a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f03a15cc73c83740fc355ee22b336492d17b4da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a550256d68bbdfa0903ab1c4595c04a6815493a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a235cec779bb39ec8f961a935b28a2ce278c6c64
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-sch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "4f03a15cc73c83740fc355ee22b336492d17b4da",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "7a550256d68bbdfa0903ab1c4595c04a6815493a",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "a235cec779bb39ec8f961a935b28a2ce278c6c64",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "4508366ab7dd0c2917a51a9c2e23cc1b9d35157a",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "41cad91a09d69e8fff4e936db29b1054b4e9f9f7",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            },
            {
              "lessThan": "286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b",
              "status": "affected",
              "version": "7a81638485c1a62a87b4c391ecc9c651a4a9dc19",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-sch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: sch: use raw_spinlock_t in the irq startup path\n\nsch_irq_unmask() enables the GPIO IRQ and then updates the controller\nstate through sch_irq_mask_unmask(), which takes sch-\u003elock with\nspin_lock_irqsave().  The callback can be reached from irq_startup()\nwhile setting up a requested IRQ.  That path is not sleepable, but on\nPREEMPT_RT a regular spinlock_t becomes a sleeping lock.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the request_threaded_irq() -\u003e __setup_irq() -\u003e\nirq_startup() -\u003e sch_irq_unmask() -\u003e sch_irq_mask_unmask() carrier and\nused the original spin_lock_irqsave(\u0026sch-\u003elock) edge.  Lockdep reported:\n\n  BUG: sleeping function called from invalid context\n  hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv]\n  sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv]\n  sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv]\n  __setup_irq.constprop.0+0xd/0x30 [vuln_msv]\n\nConvert the SCH controller lock to raw_spinlock_t.  The same lock is\nalso used by the GPIO direction and value callbacks, but those critical\nsections only update MMIO-backed GPIO registers and do not contain\nsleepable operations.  Keeping this register lock non-sleeping is\ntherefore appropriate for the irqchip callbacks and does not change the\nGPIO-side locking contract."
    }
  ],
  "id": "CVE-2026-64428",
  "lastModified": "2026-07-25T10:17:26.947",
  "metrics": {},
  "published": "2026-07-25T10:17:26.947",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b1aa05ec27eeccc889ecaa3f2d9baa9f453e50d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/41cad91a09d69e8fff4e936db29b1054b4e9f9f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4508366ab7dd0c2917a51a9c2e23cc1b9d35157a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4f03a15cc73c83740fc355ee22b336492d17b4da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7a550256d68bbdfa0903ab1c4595c04a6815493a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a235cec779bb39ec8f961a935b28a2ce278c6c64"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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