{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a"
            },
            {
              "fixed": "efc76a3f5353dd33a2e2ad48200cd4a18de30a0d"
            },
            {
              "fixed": "935e6872db7faecfbe1a10b3f5d97a62fdff5ec9"
            },
            {
              "fixed": "98f292cb6d01487d17988d9fd4e19c13e7adb156"
            },
            {
              "fixed": "16da33cb36e663b6967112185e11d00ce8ff957c"
            },
            {
              "fixed": "ff050589a21967883bb55f6dba42568f8367ad4a"
            },
            {
              "fixed": "466ab0c41d5f54f71cee60619d07c4abd0ffd2cd"
            },
            {
              "fixed": "c0a4ec89fc26e4b679b04f1002c503cb2529acdc"
            },
            {
              "fixed": "a02b8950d619123da64f69b70fe1dadef217dfe4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.151"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.103"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74468.json"
  },
  "details": "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()'s 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\").",
  "id": "CVE-2026-74468",
  "modified": "2026-08-21T03:30:40.535284688Z",
  "published": "2026-08-15T12:27:06.250Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16da33cb36e663b6967112185e11d00ce8ff957c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466ab0c41d5f54f71cee60619d07c4abd0ffd2cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/935e6872db7faecfbe1a10b3f5d97a62fdff5ec9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98f292cb6d01487d17988d9fd4e19c13e7adb156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a02b8950d619123da64f69b70fe1dadef217dfe4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0a4ec89fc26e4b679b04f1002c503cb2529acdc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efc76a3f5353dd33a2e2ad48200cd4a18de30a0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff050589a21967883bb55f6dba42568f8367ad4a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74468.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74468"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "gpio: pch: use raw_spinlock_t for the register lock"
}