CVE-2026-74468 (GCVE-0-2026-74468)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
Title
gpio: pch: use raw_spinlock_t for the register lock
Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: pch: use raw_spinlock_t for the register lock pch_irq_type() is registered as the irq_chip .irq_set_type callback and takes chip->spinlock with spin_lock_irqsave(). This callback is reached from __setup_irq() -> __irq_set_trigger() -> chip->irq_set_type() while the caller holds desc->lock, a raw_spinlock_t, with hardirqs disabled. That context is not sleepable, but on PREEMPT_RT a regular spinlock_t is an rtmutex-backed sleeping lock, so acquiring it there is invalid. This was confirmed on a PREEMPT_RT kernel with lockdep (PROVE_RAW_LOCK_NESTING and DEBUG_ATOMIC_SLEEP). A grounded PoC mirrored pch_irq_type()'s locking and drove it through the real genirq carrier irq_set_irq_type() -> __irq_set_trigger() -> chip->irq_set_type(), i.e. the same __irq_set_trigger() edge that __setup_irq() takes for a requested IRQ. With the original spin_lock_irqsave() edge lockdep reported an invalid wait context, immediately followed by: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 95, name: insmod hardirqs last disabled at (3784): _raw_spin_lock_irqsave+0x4f/0x60 rt_spin_lock+0x3a/0x1c0 repro_irq_set_type+0x64/0xa0 [pch_repro] __irq_set_trigger+0x69/0x140 irq_set_irq_type+0x78/0xd0 Switching the mirrored lock to raw_spinlock_t made both splats go away. Convert the register lock to raw_spinlock_t. The same lock also serializes the GPIO direction/value callbacks and the suspend/resume register save/restore, but all of those critical sections only perform MMIO register accesses (ioread32()/iowrite32()) and irq_set_handler_locked(); none of them 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. This is the same class of issue and fix as recently addressed for other GPIO controllers, e.g. commit 286533cb14a3 ("gpio: sch: use raw_spinlock_t in the irq startup path") and commit 90f0109019e6 ("gpio: eic-sprd: use raw_spinlock_t in the irq startup path").
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < efc76a3f5353dd33a2e2ad48200cd4a18de30a0d (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < 935e6872db7faecfbe1a10b3f5d97a62fdff5ec9 (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < 98f292cb6d01487d17988d9fd4e19c13e7adb156 (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < 16da33cb36e663b6967112185e11d00ce8ff957c (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < ff050589a21967883bb55f6dba42568f8367ad4a (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < 466ab0c41d5f54f71cee60619d07c4abd0ffd2cd (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < c0a4ec89fc26e4b679b04f1002c503cb2529acdc (git)
Affected: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a , < a02b8950d619123da64f69b70fe1dadef217dfe4 (git)
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Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-pch.c"
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              "version": "5.10.265",
              "versionType": "semver"
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
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              "version": "6.1.183",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
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              "status": "unaffected",
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              "version": "7.2",
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            }
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      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: pch: use raw_spinlock_t for the register lock\n\npch_irq_type() is registered as the irq_chip .irq_set_type callback and\ntakes chip-\u003espinlock with spin_lock_irqsave().  This callback is reached\nfrom __setup_irq() -\u003e __irq_set_trigger() -\u003e chip-\u003eirq_set_type() while\nthe caller holds desc-\u003elock, a raw_spinlock_t, with hardirqs disabled.\nThat context is not sleepable, but on PREEMPT_RT a regular spinlock_t is\nan rtmutex-backed sleeping lock, so acquiring it there is invalid.\n\nThis was confirmed on a PREEMPT_RT kernel with lockdep\n(PROVE_RAW_LOCK_NESTING and DEBUG_ATOMIC_SLEEP).  A grounded PoC mirrored\npch_irq_type()\u0027s locking and drove it through the real genirq carrier\nirq_set_irq_type() -\u003e __irq_set_trigger() -\u003e chip-\u003eirq_set_type(), i.e.\nthe same __irq_set_trigger() edge that __setup_irq() takes for a\nrequested IRQ.  With the original spin_lock_irqsave() edge lockdep\nreported an invalid wait context, immediately followed by:\n\n  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n  in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 95, name: insmod\n  hardirqs last disabled at (3784): _raw_spin_lock_irqsave+0x4f/0x60\n   rt_spin_lock+0x3a/0x1c0\n   repro_irq_set_type+0x64/0xa0 [pch_repro]\n   __irq_set_trigger+0x69/0x140\n   irq_set_irq_type+0x78/0xd0\n\nSwitching the mirrored lock to raw_spinlock_t made both splats go away.\n\nConvert the register lock to raw_spinlock_t.  The same lock also\nserializes the GPIO direction/value callbacks and the suspend/resume\nregister save/restore, but all of those critical sections only perform\nMMIO register accesses (ioread32()/iowrite32()) and\nirq_set_handler_locked(); none of them contain sleepable operations.\nKeeping this register lock non-sleeping is therefore appropriate for the\nirqchip callbacks and does not change the GPIO-side locking contract.\n\nThis is the same class of issue and fix as recently addressed for other\nGPIO controllers, e.g. commit 286533cb14a3 (\"gpio: sch: use raw_spinlock_t\nin the irq startup path\") and commit 90f0109019e6 (\"gpio: eic-sprd: use\nraw_spinlock_t in the irq startup path\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:12.926Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/efc76a3f5353dd33a2e2ad48200cd4a18de30a0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/935e6872db7faecfbe1a10b3f5d97a62fdff5ec9"
        },
        {
          "url": "https://git.kernel.org/stable/c/98f292cb6d01487d17988d9fd4e19c13e7adb156"
        },
        {
          "url": "https://git.kernel.org/stable/c/16da33cb36e663b6967112185e11d00ce8ff957c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff050589a21967883bb55f6dba42568f8367ad4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/466ab0c41d5f54f71cee60619d07c4abd0ffd2cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0a4ec89fc26e4b679b04f1002c503cb2529acdc"
        },
        {
          "url": "https://git.kernel.org/stable/c/a02b8950d619123da64f69b70fe1dadef217dfe4"
        }
      ],
      "title": "gpio: pch: use raw_spinlock_t for the register lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74468",
    "datePublished": "2026-08-15T12:27:06.250Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-19T16:37:12.926Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74468",
      "date": "2026-08-28",
      "epss": "0.0018",
      "percentile": "0.07659"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T15:01:01.000Z",
      "cve": "CVE-2026-74468",
      "id": "msrc_CVE-2026-74468",
      "initial_release_date": "2026-08-23T15:01:01.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "gpio: pch: use raw_spinlock_t for the register lock",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74468.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74468\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:51.500\",\"lastModified\":\"2026-08-19T17:21:03.810\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ngpio: pch: use raw_spinlock_t for the register lock\\n\\npch_irq_type() is registered as the irq_chip .irq_set_type callback and\\ntakes chip-\u003espinlock with spin_lock_irqsave().  This callback is reached\\nfrom __setup_irq() -\u003e __irq_set_trigger() -\u003e chip-\u003eirq_set_type() while\\nthe caller holds desc-\u003elock, a raw_spinlock_t, with hardirqs disabled.\\nThat context is not sleepable, but on PREEMPT_RT a regular spinlock_t is\\nan rtmutex-backed sleeping lock, so acquiring it there is invalid.\\n\\nThis was confirmed on a PREEMPT_RT kernel with lockdep\\n(PROVE_RAW_LOCK_NESTING and DEBUG_ATOMIC_SLEEP).  A grounded PoC mirrored\\npch_irq_type()\u0027s locking and drove it through the real genirq carrier\\nirq_set_irq_type() -\u003e __irq_set_trigger() -\u003e chip-\u003eirq_set_type(), i.e.\\nthe same __irq_set_trigger() edge that __setup_irq() takes for a\\nrequested IRQ.  With the original spin_lock_irqsave() edge lockdep\\nreported an invalid wait context, immediately followed by:\\n\\n  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\\n  in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 95, name: insmod\\n  hardirqs last disabled at (3784): _raw_spin_lock_irqsave+0x4f/0x60\\n   rt_spin_lock+0x3a/0x1c0\\n   repro_irq_set_type+0x64/0xa0 [pch_repro]\\n   __irq_set_trigger+0x69/0x140\\n   irq_set_irq_type+0x78/0xd0\\n\\nSwitching the mirrored lock to raw_spinlock_t made both splats go away.\\n\\nConvert the register lock to raw_spinlock_t.  The same lock also\\nserializes the GPIO direction/value callbacks and the suspend/resume\\nregister save/restore, but all of those critical sections only perform\\nMMIO register accesses (ioread32()/iowrite32()) and\\nirq_set_handler_locked(); none of them contain sleepable operations.\\nKeeping this register lock non-sleeping is therefore appropriate for the\\nirqchip callbacks and does not change the GPIO-side locking contract.\\n\\nThis is the same class of issue and fix as recently addressed for other\\nGPIO controllers, e.g. commit 286533cb14a3 (\\\"gpio: sch: use raw_spinlock_t\\nin the irq startup path\\\") and commit 90f0109019e6 (\\\"gpio: eic-sprd: use\\nraw_spinlock_t in the irq startup path\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpio/gpio-pch.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"efc76a3f5353dd33a2e2ad48200cd4a18de30a0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"935e6872db7faecfbe1a10b3f5d97a62fdff5ec9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"98f292cb6d01487d17988d9fd4e19c13e7adb156\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"16da33cb36e663b6967112185e11d00ce8ff957c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"ff050589a21967883bb55f6dba42568f8367ad4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"466ab0c41d5f54f71cee60619d07c4abd0ffd2cd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"c0a4ec89fc26e4b679b04f1002c503cb2529acdc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"38eb18a6f92da886fc1af509d25e8f7a49e23d9a\",\"lessThan\":\"a02b8950d619123da64f69b70fe1dadef217dfe4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpio/gpio-pch.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16da33cb36e663b6967112185e11d00ce8ff957c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/466ab0c41d5f54f71cee60619d07c4abd0ffd2cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/935e6872db7faecfbe1a10b3f5d97a62fdff5ec9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98f292cb6d01487d17988d9fd4e19c13e7adb156\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a02b8950d619123da64f69b70fe1dadef217dfe4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0a4ec89fc26e4b679b04f1002c503cb2529acdc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/efc76a3f5353dd33a2e2ad48200cd4a18de30a0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff050589a21967883bb55f6dba42568f8367ad4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T08:23:26+00:00",
      "cve": "CVE-2026-74468",
      "id": "CVE-2026-74468",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gpio: pch: use raw_spinlock_t for the register lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74468.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.