{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74468", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.902Z", "datePublished": "2026-08-15T12:27:06.250Z", "dateUpdated": "2026-08-19T16:37:12.926Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:37:12.926Z" }, "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->spinlock with spin_lock_irqsave(). This callback is reached\nfrom __setup_irq() -> __irq_set_trigger() -> chip->irq_set_type() while\nthe caller holds desc->lock, 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() -> __irq_set_trigger() -> chip->irq_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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpio/gpio-pch.c" ], "versions": [ { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "efc76a3f5353dd33a2e2ad48200cd4a18de30a0d", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "935e6872db7faecfbe1a10b3f5d97a62fdff5ec9", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "98f292cb6d01487d17988d9fd4e19c13e7adb156", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "16da33cb36e663b6967112185e11d00ce8ff957c", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "ff050589a21967883bb55f6dba42568f8367ad4a", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "466ab0c41d5f54f71cee60619d07c4abd0ffd2cd", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "c0a4ec89fc26e4b679b04f1002c503cb2529acdc", "status": "affected", "versionType": "git" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "lessThan": "a02b8950d619123da64f69b70fe1dadef217dfe4", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpio/gpio-pch.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }