251 lines
14 KiB
JSON
251 lines
14 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-2026-72395",
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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": "2026-08-09T03:40:39.924Z",
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"datePublished": "2026-08-15T05:56:22.400Z",
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"dateUpdated": "2026-10-30T12:29:15.667Z"
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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": "2026-10-30T12:29:15.667Z"
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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\nhwmon: (pmbus) Fix passing events to regulator core\n\nSashiko reports:\n\nCommit 754bd2b4a084 (\"hwmon: (pmbus/core) Protect regulator operations with\nmutex\") introduced a worker to batch regulator events over time using\natomic_or(). The delayed worker then passes the combined bitmask unmodified\nto regulator_notifier_call_chain().\n\nThe core regulator subsystem's regulator_handle_critical() function\nevaluates the event parameter using a strict switch statement. If\nmultiple distinct faults occur before the worker runs (e.g.,\nREGULATOR_EVENT_UNDER_VOLTAGE | REGULATOR_EVENT_OVER_CURRENT), the combined\nbitmask fails to match any case. This leaves the reason as NULL and\ncompletely bypasses the critical hw_protection_trigger().\n\nFix the problem by passing events bit by bit to the regulator event\nhandler."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 flaw is only reachable through the PMBus SMBALERT threaded IRQ handler (pmbus_fault_handler) that reads hardware fault status over I2C; there is no network, adjacent-radio, or direct physical-device API path, but local actors on PMBus-equipped servers, routers, and embedded boards can induce multi-fault conditions.\nAC:L - _pmbus_get_flags() ORs multiple REGULATOR_EVENT_* bits from a single STATUS read, and pmbus_regulator_notify() further batches concurrent IRQs via atomic_or() before the worker runs, so combined masks like UNDER_VOLTAGE|OVER_CURRENT are produced deterministically without races or layout dependencies the attacker cannot influence.\nPR:L - Triggering the IRQ requires causing real PMBus regulator fault bits (e.g., over-current plus under-voltage during supply stress), which an unprivileged local user can induce through heavy workload and power instability on affected platforms; CAP_NET_ADMIN/user-namespace tricks are not needed and no init-namespace root capability is required.\nUI:N - Once fault conditions are present the SMBALERT IRQ and workqueue fire automatically through pmbus_fault_handler and pmbus_regulator_notify_worker; no separate victim action such as mounting media, plugging hardware, or approving a prompt is required.\nS:U - The impact is bypassing kernel hw_protection_trigger() orderly shutdown/reboot for system-critical PMBus regulators on the same host; it does not cross VM, IOMMU, or sandbox security boundaries and is not a guest-to-host escape.\nC:N - This is a notifier bit-mask logic error that leaves regulator_handle_critical() with a NULL reason; there is no kernel memory corruption, use-after-free, or out-of-bounds access that could disclose pointers or arbitrary memory.\nI:H - When multiple distinct fault events are combined, hw_protection_trigger() is completely skipped for system-critical regulators, defeating the kernel's mandatory emergency shutdown policy and allowing continued operation under simultaneous critical under-voltage/over-current/fail conditions that can corrupt power hardware.\nA:H - Bypassing hw_protection_trigger() during simultaneous critical PMBus regulator faults prevents the intended emergency orderly_poweroff/reboot, leaving telecom, data-center, and embedded systems running under dangerous rail conditions that can cause hardware failure, forced resets, and sustained 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/hwmon/pmbus/pmbus_core.c"
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],
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"versions": [
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{
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"version": "b26849cffaa7c43355b82e9bef3725e786973a1a",
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"lessThan": "2106bf4056858fcce3624e0c51f6fee4d41d3f2f",
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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": "acf04e2863132f6d9222f71f3a76fb9782cbe061",
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"lessThan": "48fe43666950efefb7ac5fbdc012c1b3604096bf",
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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": "4e9d723d9f198b86f6882a84c501ba1f39e8d055",
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"lessThan": "489291b6b56978cc50d34e8e13f9636ea296ba8a",
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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": "754bd2b4a084b90b5e7b630e1f423061a9b9b761",
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"lessThan": "b0ff6b6ae9c5183ef701ece7016698bde5a5bfba",
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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": "754bd2b4a084b90b5e7b630e1f423061a9b9b761",
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"lessThan": "9ef7dacd44216bf5ea05c8aef49eba4d145f4047",
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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": "f0c9ea9c3a208e79c812e10e2bcef87b46564f01",
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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": "2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07",
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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": "6.6.143",
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"lessThan": "6.6.145",
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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": "6.12.92",
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"lessThan": "6.12.97",
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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": "6.18.21",
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"lessThan": "6.18.40",
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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": "6.1.191",
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"lessThan": "6.2",
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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": "6.19.11",
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"lessThan": "6.20",
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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/hwmon/pmbus/pmbus_core.c"
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],
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"versions": [
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{
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"version": "7.0",
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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": "7.0",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.143",
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"versionEndExcluding": "6.6.145"
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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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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf"
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},
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{
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"url": "https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a"
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},
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{
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"url": "https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba"
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},
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{
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"url": "https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047"
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}
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],
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"title": "hwmon: (pmbus) Fix passing events to regulator core",
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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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}
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} |