{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-74468", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74468", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-15T12:27:06.250Z", "updatedAt": "2026-08-19T16:37:12.926Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "gpio: pch: use raw_spinlock_t for the register lock", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "efc76a3f5353dd33a2e2ad48200cd4a18de30a0d" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "935e6872db7faecfbe1a10b3f5d97a62fdff5ec9" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "98f292cb6d01487d17988d9fd4e19c13e7adb156" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "16da33cb36e663b6967112185e11d00ce8ff957c" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "ff050589a21967883bb55f6dba42568f8367ad4a" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "466ab0c41d5f54f71cee60619d07c4abd0ffd2cd" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "c0a4ec89fc26e4b679b04f1002c503cb2529acdc" }, { "version": "38eb18a6f92da886fc1af509d25e8f7a49e23d9a", "status": "affected", "versionType": "git", "lessThan": "a02b8950d619123da64f69b70fe1dadef217dfe4" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.2" }, { "version": "5.10.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.216", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.183", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.151", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.103", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.44", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }