CVE-2026-93177 (GCVE-0-2026-93177)
Vulnerability from cvelistv5
Published
2026-09-17 16:12
Modified
2026-10-19 09:06
Severity ?
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/pm/powerplay: bounds-check voltage index in Vega10 lookup vddInd, vddciInd and mvddInd from VBIOS-parsed tables index into vddc, vddci and vddmem lookup tables without bounds checks across nine sites. Return -EINVAL when any index is out of range.
References
Impacted products
Vendor Product Version
Linux Linux Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
Version: f83a9991648bb4023a53104db699e99305890d51
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "206e478810d6af50b25d8da72e3af8d55a014365",
              "status": "affected",
              "version": "f83a9991648bb4023a53104db699e99305890d51",
              "versionType": "git"
            },
            {
              "lessThan": "25dedc13ceb9b6109c79c92a726ca4ca017c9eaa",
              "status": "affected",
              "version": "f83a9991648bb4023a53104db699e99305890d51",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f83a9991648bb4023a53104db699e99305890d51",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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            },
            {
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/pm/powerplay: bounds-check voltage index in Vega10 lookup\n\nvddInd, vddciInd and mvddInd from VBIOS-parsed tables index into vddc,\nvddci and vddmem lookup tables without bounds checks across nine sites.\nReturn -EINVAL when any index is out of range."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Writing a crafted ATOM Vega10 POWERPLAYTABLE to sysfs pp_table (amdgpu_set_pp_table \u2192 pp_dpm_set_pp_table \u2192 amd_powerplay_reset \u2192 hwmgr_hw_init) makes vega10_pp_tables_initialize copy ucVddInd/ucVddciInd/ucVddMemInd into vddInd; vega10_hwmgr_backend_init then calls vega10_patch_voltage_dependency_tables_with_lookup_table. No network protocol carries those indices.\nAC:L - The attacker fully controls ucVddInd in each ATOM_Vega10 dependency-table entry they write; get_socclk_voltage_dependency_table and get_mclk_voltage_dependency_table copy it verbatim into vddInd, and the unguarded entries[voltage_id].us_vdd load in vega10_patch_voltage_dependency_tables_with_lookup_table is deterministic with no race or victim state.\nPR:L - amdgpu_set_pp_table and pp_dpm_set_pp_table perform no capable() check; the pp_table attribute is created as S_IRUGO|S_IWUSR, and AMD desktop/handheld udev rules commonly grant group write on pp_* nodes so unprivileged overclocking tools can use them (same attribute scored PR:L in CVE-2025-21780 and CVE-2026-74450).\nUI:N - The attacker writes the malformed POWERPLAYTABLE on their own pp_table sysfs node and amd_powerplay_reset runs in that store; no other user must mount a filesystem, plug in a GPU, or open a file.\nS:U - The OOB us_vdd load and later convert_to_vid SMC programming stay inside the host amdgpu powerplay heap and Vega10 SMU tables; they do not cross a KVM/IOMMU guest-host boundary (pp_table writes are rejected for SR-IOV VFs by amdgpu_dpm_is_pp_table_allowed).\nC:H - voltage_id is a uint8_t taken from vddInd, so entries[voltage_id].us_vdd in vega10_patch_voltage_dependency_tables_with_lookup_table reads two bytes at an attacker-chosen offset of up to 255*sizeof(phm_ppt_v1_voltage_lookup_record) (~2.5KB) past a vddc_lookup_table that get_vddc_lookup_table allocated for only 8 entries (4 for vddci/vddmem).\nI:L - The OOB us_vdd is written only into in-bounds vddc/vddci/mvdd fields and later turned into SMC VIDs by convert_to_vid in vega10_populate_single_display_type and vega10_get_vdd_voltage_table, programming out-of-spec GPU rails. That is bounded power-management state corruption, not an arbitrary kernel write.\nA:H - A ~2.5KB heap overread from the kmalloc-flex lookup table can oops or KASAN-panic, and garbage millivolts converted to VID and loaded into Vega10 PPTable_t DisplayClockTable via vega10_populate_single_display_type can hang or reset the GPU."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:06:49.236Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/206e478810d6af50b25d8da72e3af8d55a014365"
        },
        {
          "url": "https://git.kernel.org/stable/c/25dedc13ceb9b6109c79c92a726ca4ca017c9eaa"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae25c92d91f2cb90ede2b0eb0f58efa82ccc718b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b349dcf061a6dc8c6cef9a10530331ef2ff66c72"
        },
        {
          "url": "https://git.kernel.org/stable/c/dfe89f1a0c7f40ef858b93881198f9728df956cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/46d27e56dbd6345b9c7b62b67ec57407bf3bf29a"
        },
        {
          "url": "https://git.kernel.org/stable/c/06aef6dcc1d52da5112cbcde39c062e493247ab5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6fa33f594e46e775a94097f71b486d7b006b6917"
        }
      ],
      "title": "drm/amdgpu/pm/powerplay: bounds-check voltage index in Vega10 lookup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93177",
    "datePublished": "2026-09-17T16:12:05.955Z",
    "dateReserved": "2026-09-17T16:02:15.091Z",
    "dateUpdated": "2026-10-19T09:06:49.236Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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