{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72397", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.924Z", "datePublished": "2026-08-15T05:56:23.675Z", "dateUpdated": "2026-08-17T05:43:39.708Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:39.708Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()\n\npmbus_data2reg_vid() hardcoded the VR11 encoding regardless of the\nvrm_version configured by the driver, while pmbus_reg2data_vid()\nalready switched on it. Any driver that selects a non-VR11 VID mode\nand exposes a regulator (or hwmon vout setter) sent dangerously\nwrong codes to PMBUS_VOUT_COMMAND -- e.g. an nvidia195mv part asked\nfor 200 mV got the VR11 clamp to 500 mV encoded as 0xB2, which the\nchip interprets as 1080 mV.\n\nMirror pmbus_reg2data_vid() so writes round-trip with reads."}], "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 bug is only reached from local host interfaces\u2014writable hwmon sysfs attributes (pmbus_set_sensor) and the PMBus regulator set_voltage path (pmbus_regulator_set_voltage)\u2014which encode values and issue I2C PMBUS_VOUT_COMMAND writes; there is no network, adjacent-radio, or direct physical-access entry point.\nAC:L - On systems with non-VR11 VID PMBus controllers (VR12/VR13/IMVP9/AMD/nvidia195mv), any voltage-setting write deterministically uses the wrong VR11 encoding with no race, timing window, or uncontrollable memory layout; the attacker fully controls the written millivolt value and can repeat the operation reliably.\nPR:L - Writable hwmon limit attributes are exposed as mode 0644 with no capability check in pmbus_set_sensor, so a local uid-0 context (including user-namespace root or container root with /sys access) can drive the bad encoding; regulator consumers can also be influenced from ordinary local workloads on affected server/GPU platforms.\nUI:N - Exploitation requires only the attacker (or attacker-controlled software) to write hwmon voltage limits or invoke regulator voltage changes; no separate victim interaction such as plugging hardware or approving a prompt is needed.\nS:U - Impact is confined to misprogramming PMBus voltage rails on the same host kernel authority; it does not cross VM, IOMMU, or sandbox boundaries and is not a guest-to-host escape.\nC:N - This is a write-side VID encoding logic error, not kernel memory corruption; reads use the correct pmbus_reg2data_vid path and the flaw does not disclose kernel pointers, arbitrary memory, or other confidential data.\nI:H - Incorrect VID-to-register conversion sends dangerously wrong PMBUS_VOUT_COMMAND values to hardware (e.g., 200 mV requested on nvidia195mv becomes 1080 mV applied), corrupting critical CPU/GPU/board power-rail configuration and potentially causing permanent hardware damage.\nA:H - Severe over- or under-voltage on core power rails can trigger immediate hardware protection shutdowns, system hangs/resets, and sustained denial of service on data-center, HPC, and GPU server deployments using affected PMBus VRM controllers."}]}], "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": "068c227056b9223fea1a759e08db2558d5cbb5ad", "lessThan": "5bd0d47640395f8a8c34446b62d1781b88869dfa", "status": "affected", "versionType": "git"}, {"version": "068c227056b9223fea1a759e08db2558d5cbb5ad", "lessThan": "828cd614e2af053ca5e1d6da767bbd8a1b5cabfb", "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/pmbus_core.c"], "versions": [{"version": "4.3", "status": "affected"}, {"version": "0", "lessThan": "4.3", "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": "4.3", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5bd0d47640395f8a8c34446b62d1781b88869dfa"}, {"url": "https://git.kernel.org/stable/c/828cd614e2af053ca5e1d6da767bbd8a1b5cabfb"}], "title": "hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()", "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": "5bd0d47640395f8a8c34446b62d1781b88869dfa", "status": "affected", "version": "068c227056b9223fea1a759e08db2558d5cbb5ad", "versionType": "git"}, {"lessThan": "828cd614e2af053ca5e1d6da767bbd8a1b5cabfb", "status": "affected", "version": "068c227056b9223fea1a759e08db2558d5cbb5ad", "versionType": "git"}]}, {"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": "4.3"}, {"lessThan": "4.3", "status": "unaffected", "version": "0", "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/core) honor vrm_version in pmbus_data2reg_vid()\n\npmbus_data2reg_vid() hardcoded the VR11 encoding regardless of the\nvrm_version configured by the driver, while pmbus_reg2data_vid()\nalready switched on it. Any driver that selects a non-VR11 VID mode\nand exposes a regulator (or hwmon vout setter) sent dangerously\nwrong codes to PMBUS_VOUT_COMMAND -- e.g. an nvidia195mv part asked\nfor 200 mV got the VR11 clamp to 500 mV encoded as 0xB2, which the\nchip interprets as 1080 mV.\n\nMirror pmbus_reg2data_vid() so writes round-trip with reads."}], "id": "CVE-2026-72397", "lastModified": "2026-08-17T06:19:06.263", "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": "2026-08-15T06:22:13.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5bd0d47640395f8a8c34446b62d1781b88869dfa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/828cd614e2af053ca5e1d6da767bbd8a1b5cabfb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}