284 lines
15 KiB
JSON
284 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74733",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.930Z",
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"datePublished": "2026-08-22T15:33:21.579Z",
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"dateUpdated": "2026-10-30T12:30:25.982Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:30:25.982Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock\n\nLocking is disabled in the regmap config as this driver uses its own\nlock. This means that all calls to regmap functions (read or write) must\nhold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do\nthis, and it was therefore possible that multiple threads could cause an\nincorrect register to be read/written.\n\nA previous patch partly fixed this, but only protected the write to the\ninterrupt mask register, and not the read from the direction register."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable pca953x_irq_bus_sync_unlock() path is reached only through local kernel interfaces—GPIO chardev ioctls (GPIO_V2_GET_LINE_IOCTL, GPIO_V2_LINE_SET_CONFIG_IOCTL, GPIO_V2_LINE_SET_VALUES_IOCTL), legacy sysfs GPIO, or concurrent in-kernel GPIO/IRQ ops—not via any network or physical bus-facing attack surface.\nAC:L - An attacker drives both racing sides directly: one thread loops IRQ edge-detection setup/teardown (request_irq → irq_bus_sync_unlock) while another hammers GPIO value/direction writes holding i2c_lock; the original report reproduced the race ~1 in 1000 boots, so deliberate concurrency wins reliably.\nPR:L - Exploitation requires an open file descriptor on /dev/gpiochipN or sysfs GPIO access; on embedded, industrial, medical, and automotive boards using pca953x expanders, udev routinely grants gpio group membership to unprivileged local users.\nUI:N - No victim interaction is required—the attacker performs all GPIO ioctl and IRQ configuration steps in its own threads without needing another user to mount, open, or configure devices.\nS:U - Corruption is confined to the kernel and the same on-board I2C GPIO expander; it does not cross VM, container, IOMMU, or other security-boundary scopes into a different authority.\nC:H - With regmap disable_locking=true, the unprotected pca953x_read_regs() direction read races locked regmap paths, corrupting the maple regcache and returning data from the wrong register—yielding kernel heap UAF read and unintended register-state disclosure.\nI:H - Racing regmap transactions write interrupt-latch/direction data into wrong expander registers (documented output-register corruption), arbitrarily toggling safety-critical GPIO outputs; concurrent unsynchronized regcache writes provide a heap corruption/write primitive.\nA:H - Concurrent regcache maple-tree corruption from unsynchronized regmap access can trigger kernel oops/panic via double-free; miswritten interrupt masks or direction registers can wedge expander IRQ handling and GPIO consumers in a persistent denial-of-service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpio/gpio-pca953x.c"
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],
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"versions": [
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{
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"version": "58a5c93bd1a6e949267400080f07e57ffe05ec34",
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"lessThan": "58ed56c093a857c19f04cf3db1f02d2e793aec88",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2ecdddca80dd845df42376e4b0197fe97018ba2",
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"lessThan": "5d05c4252c09ce10624be2197853c80bf87424e4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bfc6444b57dc7186b6acc964705d7516cbaf3904",
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"lessThan": "41255e64eb9dd87b0b8675f4e47a9c67bcef6e39",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bfc6444b57dc7186b6acc964705d7516cbaf3904",
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"lessThan": "bf3f37c2d40b51deb79aea910f28999d7c8c6b5a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bfc6444b57dc7186b6acc964705d7516cbaf3904",
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"lessThan": "e6a2f5f845f50b0c4299bace5111f56d3390a090",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bfc6444b57dc7186b6acc964705d7516cbaf3904",
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"lessThan": "9dc325327babe7f159e84cbe9380a45342da0585",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "de7cffa53149c7b48bd1bb29b02390c9f05b7f41",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.101",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.42",
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"lessThan": "6.6.160",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.9.11",
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"lessThan": "6.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpio/gpio-pca953x.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.101",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.42",
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"versionEndExcluding": "6.6.160"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.12.114"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.18.57"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.1.9"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.2"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/58ed56c093a857c19f04cf3db1f02d2e793aec88"
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},
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{
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"url": "https://git.kernel.org/stable/c/5d05c4252c09ce10624be2197853c80bf87424e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/41255e64eb9dd87b0b8675f4e47a9c67bcef6e39"
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},
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{
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"url": "https://git.kernel.org/stable/c/bf3f37c2d40b51deb79aea910f28999d7c8c6b5a"
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},
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{
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"url": "https://git.kernel.org/stable/c/e6a2f5f845f50b0c4299bace5111f56d3390a090"
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},
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{
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"url": "https://git.kernel.org/stable/c/9dc325327babe7f159e84cbe9380a45342da0585"
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}
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],
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"title": "gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74733",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:15:53.820928Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:16:12.549Z"
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}
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}
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]
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}
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} |