{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64084", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.031Z", "datePublished": "2026-07-19T15:39:55.417Z", "dateUpdated": "2026-08-05T12:39:02.926Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:02.926Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR\n\nadm1266_gpio_get_multiple() iterates the PDIO portion of the\ncaller-supplied mask using\n\n\tfor_each_set_bit_from(gpio_nr, mask,\n\t\t\t ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {\n\t\t...\n\t}\n\nwhere ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233),\nnot the number of PDIO pins. The intended upper bound is\nADM1266_GPIO_NR + ADM1266_PDIO_NR = 25.\n\ngpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip),\nso the iteration walks find_next_bit() up to 242, reading up to 217\nextra bits (a handful of unsigned-long words: four on 64-bit, seven\non 32-bit) of whatever lives past the end of the mask in the\ncaller's stack. Any incidental set bit in that range then drives a\nset_bit(gpio_nr, bits) call that writes past the end of the\ncaller-supplied bits array too -- both out-of-bounds.\n\nSubstitute ADM1266_PDIO_NR for the constant so the scan stops at the\nlast real PDIO bit." } ], "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 bug is only reachable through the GPIO character-device ioctl path (gpiolib → adm1266_gpio_get_multiple), which requires local access to /dev/gpiochip* on a system with an ADM1266 present on I2C; it is not triggered by network packets or physical bus access.\nAC:L - Any caller who can request ADM1266 PDIO lines and issue a multi-line GET_VALUES ioctl reliably enters the flawed loop; no race or victim state beyond attacker-controlled ioctl parameters is required.\nPR:L - Exploitation requires only a local account that can open the GPIO char device and request lines (e.g. root, gpio group membership, or a BMC service account with device access), not full init-namespace CAP_SYS_ADMIN; this is plausible on embedded/BMC deployments where ADM1266 is used.\nUI:N - Once the attacker has GPIO char-device access, triggering the bug is a single ioctl with no additional victim interaction.\nS:U - Impact is kernel stack memory corruption and potential privilege escalation within the same kernel security domain; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The flawed loop performs out-of-bounds reads of up to ~217 bits beyond the 25-bit mask into adjacent kernel stack memory, constituting kernel memory disclosure per OOB-read guidance.\nI:H - Incidental set bits found during the out-of-bounds mask scan drive set_bit() writes past the end of the caller-supplied bits array, causing out-of-bounds kernel stack writes that could be leveraged for control-flow hijacking.\nA:H - Stack corruption from the out-of-bounds writes can cause kernel oops, panic, or hang, satisfying the kernel guidance that memory-corruption bugs warrant High availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hwmon/pmbus/adm1266.c" ], "versions": [ { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "d0593e15fdeb56048a72c5c6e720f702759d0ccd", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "17cee2f59029039416e8f6303050038eb59ba149", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "299efd14c2eda7e5fd40025e54addd4151a01081", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "4d1da9a6be5a8156c532d571c2ed237169f99244", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "b96c7f0bc0713dc6403912f6527d4ff9168d6fe6", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17", "status": "affected", "versionType": "git" }, { "version": "d98dfad35c38c037b37c4adc99df01da571031a5", "lessThan": "d7834d92251baade796812876e95555e2066fa9f", "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/hwmon/pmbus/adm1266.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.10", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d0593e15fdeb56048a72c5c6e720f702759d0ccd" }, { "url": "https://git.kernel.org/stable/c/17cee2f59029039416e8f6303050038eb59ba149" }, { "url": "https://git.kernel.org/stable/c/299efd14c2eda7e5fd40025e54addd4151a01081" }, { "url": "https://git.kernel.org/stable/c/4d1da9a6be5a8156c532d571c2ed237169f99244" }, { "url": "https://git.kernel.org/stable/c/b96c7f0bc0713dc6403912f6527d4ff9168d6fe6" }, { "url": "https://git.kernel.org/stable/c/fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec" }, { "url": "https://git.kernel.org/stable/c/2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17" }, { "url": "https://git.kernel.org/stable/c/d7834d92251baade796812876e95555e2066fa9f" } ], "title": "hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR", 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