{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-42253", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-30T07:40:12.256Z", "datePublished": "2024-08-08T08:46:29.284Z", "dateUpdated": "2026-08-05T11:36:05.727Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:05.727Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: pca953x: fix pca953x_irq_bus_sync_unlock race\n\nEnsure that `i2c_lock' is held when setting interrupt latch and mask in\npca953x_irq_bus_sync_unlock() in order to avoid races.\n\nThe other (non-probe) call site pca953x_gpio_set_multiple() ensures the\nlock is held before calling pca953x_write_regs().\n\nThe problem occurred when a request raced against irq_bus_sync_unlock()\napproximately once per thousand reboots on an i.MX8MP based system.\n\n * Normal case\n\n 0-0022: write register AI|3a {03,02,00,00,01} Input latch P0\n 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0\n 0-0022: write register AI|08 {ff,00,00,00,00} Output P3\n 0-0022: write register AI|12 {fc,00,00,00,00} Config P3\n\n * Race case\n\n 0-0022: write register AI|08 {ff,00,00,00,00} Output P3\n 0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register ***\n 0-0022: write register AI|12 {fc,00,00,00,00} Config P3\n 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable paths are reached only through local kernel interfaces — `/dev/gpiochipN` ioctls (`GPIO_V2_GET_LINE_IOCTL`, `GPIO_V2_LINE_SET_CONFIG_IOCTL`, `GPIO_V2_LINE_SET_VALUES_IOCTL`) or the legacy `/sys/class/gpio` attributes. No network or physical access is involved.\nAC:L - The attacker drives both sides of the race directly and without bound: one thread loops edge-detection setup/teardown to hit the unlocked `pca953x_irq_bus_sync_unlock()` writes while another loops value/bias writes that enter regmap under `i2c_lock`. The race occurred spontaneously ~1 in 1000 boots, so deliberate hammering wins it readily.\nPR:L - An open file descriptor on the GPIO chardev (or legacy sysfs GPIO attributes) is required; embedded, industrial and automotive distributions routinely grant these to a non-root `gpio` group via udev, so an ordinary unprivileged local user in the normal deployment for this driver qualifies.\nUI:N - The attacker performs every step itself via ioctls on its own file descriptors; no victim action, mount, or file open by another user is needed.\nS:U - The corruption is confined to kernel heap state and the I2C GPIO expander owned by the same kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - With `.disable_locking = true`, the missing `i2c_lock` leaves the regmap register cache completely unserialized; `regcache_maple_write()`/`regcache_rbtree_write()` `kfree()`/`krealloc()` cache entries with no grace period while a concurrent walker still dereferences them, yielding a use-after-free read of kernel heap, and register reads return data from the wrong register.\nI:H - The commit documents interrupt-latch data being written into the expander's Output register, arbitrarily driving GPIO lines that gate power rails, resets and interlocks; additionally the unlocked cache path gives a use-after-free/double-free write primitive on the kernel heap.\nA:H - Concurrent unlocked mutation of the shared maple-tree/rbtree register cache with unsynchronized `kfree()` leads to double free and tree corruption — kernel oops or panic — and the expander can be left with interrupts wrongly latched or masked, wedging every GPIO consumer on the bus." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpio/gpio-pca953x.c" ], "versions": [ { "version": "44896beae605b93f2232301befccb7ef42953198", "lessThan": "58a5c93bd1a6e949267400080f07e57ffe05ec34", "status": "affected", "versionType": "git" }, { "version": "44896beae605b93f2232301befccb7ef42953198", "lessThan": "e2ecdddca80dd845df42376e4b0197fe97018ba2", "status": "affected", "versionType": "git" }, { "version": "44896beae605b93f2232301befccb7ef42953198", "lessThan": "de7cffa53149c7b48bd1bb29b02390c9f05b7f41", "status": "affected", "versionType": "git" }, { "version": "44896beae605b93f2232301befccb7ef42953198", "lessThan": "bfc6444b57dc7186b6acc964705d7516cbaf3904", "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-pca953x.c" ], "versions": [ { "version": "4.7", "status": "affected" }, { "version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.101", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.42", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.11", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "4.7", "versionEndExcluding": "6.1.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.6.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.9.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/58a5c93bd1a6e949267400080f07e57ffe05ec34" }, { "url": "https://git.kernel.org/stable/c/e2ecdddca80dd845df42376e4b0197fe97018ba2" }, { "url": "https://git.kernel.org/stable/c/de7cffa53149c7b48bd1bb29b02390c9f05b7f41" }, { "url": "https://git.kernel.org/stable/c/bfc6444b57dc7186b6acc964705d7516cbaf3904" } ], "title": "gpio: pca953x: fix pca953x_irq_bus_sync_unlock race", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-42253", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:13:09.580370Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:30.290Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:02:52.505Z" } } ] } }