CVE-2026-72395

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72395", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.924Z", "datePublished": "2026-08-15T05:56:22.400Z", "dateUpdated": "2026-10-30T12:29:15.667Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:29:15.667Z"}, "descriptions": [{"lang": "en", "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/pmbus/pmbus_core.c"], "versions": [{"version": "b26849cffaa7c43355b82e9bef3725e786973a1a", "lessThan": "2106bf4056858fcce3624e0c51f6fee4d41d3f2f", "status": "affected", "versionType": "git"}, {"version": "acf04e2863132f6d9222f71f3a76fb9782cbe061", "lessThan": "48fe43666950efefb7ac5fbdc012c1b3604096bf", "status": "affected", "versionType": "git"}, {"version": "4e9d723d9f198b86f6882a84c501ba1f39e8d055", "lessThan": "489291b6b56978cc50d34e8e13f9636ea296ba8a", "status": "affected", "versionType": "git"}, {"version": "754bd2b4a084b90b5e7b630e1f423061a9b9b761", "lessThan": "b0ff6b6ae9c5183ef701ece7016698bde5a5bfba", "status": "affected", "versionType": "git"}, {"version": "754bd2b4a084b90b5e7b630e1f423061a9b9b761", "lessThan": "9ef7dacd44216bf5ea05c8aef49eba4d145f4047", "status": "affected", "versionType": "git"}, {"version": "f0c9ea9c3a208e79c812e10e2bcef87b46564f01", "status": "affected", "versionType": "git"}, {"version": "2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07", "status": "affected", "versionType": "git"}, {"version": "6.6.143", "lessThan": "6.6.145", "status": "affected", "versionType": "semver"}, {"version": "6.12.92", "lessThan": "6.12.97", "status": "affected", "versionType": "semver"}, {"version": "6.18.21", "lessThan": "6.18.40", "status": "affected", "versionType": "semver"}, {"version": "6.1.191", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.19.11", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/pmbus/pmbus_core.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.6.143", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.92", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.21", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f"}, {"url": "https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf"}, {"url": "https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a"}, {"url": "https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba"}, {"url": "https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047"}], "title": "hwmon: (pmbus) Fix passing events to regulator core", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/hwmon/pmbus/pmbus_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2106bf4056858fcce3624e0c51f6fee4d41d3f2f", "status": "affected", "version": "b26849cffaa7c43355b82e9bef3725e786973a1a", "versionType": "git"}, {"lessThan": "48fe43666950efefb7ac5fbdc012c1b3604096bf", "status": "affected", "version": "acf04e2863132f6d9222f71f3a76fb9782cbe061", "versionType": "git"}, {"lessThan": "489291b6b56978cc50d34e8e13f9636ea296ba8a", "status": "affected", "version": "4e9d723d9f198b86f6882a84c501ba1f39e8d055", "versionType": "git"}, {"lessThan": "b0ff6b6ae9c5183ef701ece7016698bde5a5bfba", "status": "affected", "version": "754bd2b4a084b90b5e7b630e1f423061a9b9b761", "versionType": "git"}, {"lessThan": "9ef7dacd44216bf5ea05c8aef49eba4d145f4047", "status": "affected", "version": "754bd2b4a084b90b5e7b630e1f423061a9b9b761", "versionType": "git"}, {"status": "affected", "version": "f0c9ea9c3a208e79c812e10e2bcef87b46564f01", "versionType": "git"}, {"status": "affected", "version": "2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07", "versionType": "git"}, {"lessThan": "6.6.145", "status": "affected", "version": "6.6.143", "versionType": "semver"}, {"lessThan": "6.12.97", "status": "affected", "version": "6.12.92", "versionType": "semver"}, {"lessThan": "6.18.40", "status": "affected", "version": "6.18.21", "versionType": "semver"}, {"lessThan": "6.2", "status": "affected", "version": "6.1.191", "versionType": "semver"}, {"lessThan": "6.20", "status": "affected", "version": "6.19.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/hwmon/pmbus/pmbus_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-72395", "lastModified": "2026-10-30T13:19:50.917", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:13.043", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: hwmon: (pmbus) Fix passing events to regulator core", "id": "2516531", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516531"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-681", "details": ["A flaw was found in the Linux kernel's hwmon (pmbus) subsystem. A worker designed to batch regulator events can combine multiple distinct hardware fault events into a single bitmask. This combined bitmask is then incorrectly processed by the critical hardware protection function, `regulator_handle_critical()`, causing it to bypass essential safety mechanisms. This could prevent the system from properly responding to critical hardware faults, potentially leading to system instability or damage."], "name": "CVE-2026-72395", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72395\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72395\nhttps://lore.kernel.org/linux-cve-announce/2026081520-CVE-2026-72395-910e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b26849cffaa7c43355b82e9bef3725e786973a1a,2106bf4056858fcce3624e0c51f6fee4d41d3f2f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[acf04e2863132f6d9222f71f3a76fb9782cbe061,48fe43666950efefb7ac5fbdc012c1b3604096bf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e9d723d9f198b86f6882a84c501ba1f39e8d055,489291b6b56978cc50d34e8e13f9636ea296ba8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[754bd2b4a084b90b5e7b630e1f423061a9b9b761,b0ff6b6ae9c5183ef701ece7016698bde5a5bfba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[754bd2b4a084b90b5e7b630e1f423061a9b9b761,9ef7dacd44216bf5ea05c8aef49eba4d145f4047)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.143,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.92,6.12.97)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.21,6.18.40)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T11:30:07.157670+00:00", "updated": "2026-08-22T08:00:13.616987+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}