CVE-2026-93178 (GCVE-0-2026-93178)
Vulnerability from cvelistv5
Published
2026-09-17 16:12
Modified
2026-10-19 09:06
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/pm/powerplay: bounds-check voltage index in SMU7 lookup vddInd and vddcInd fields from VBIOS-parsed tables are used to index into voltage lookup tables without a bounds check. Return -EINVAL when any index is out of range.
References
Impacted products
Vendor Product Version
Linux Linux Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
Version: c82baa28184356a75c0157129f88af42b2e7b695
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
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              "versionType": "git"
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.5"
            },
            {
              "lessThan": "4.5",
              "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": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.5",
                  "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 SMU7 lookup\n\nvddInd and vddcInd fields from VBIOS-parsed tables are used to index into\nvoltage lookup tables without a bounds check. Return -EINVAL when any\nindex is out of range."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled ATOM_Tonga_SCLK_Dependency_Record.ucVddInd (and MCLK ucVddcInd / MM ucVddcInd) bytes enter via write() on /sys/class/drm/cardN/device/pp_table; amdgpu_set_pp_table \u2192 pp_dpm_set_pp_table copies them into hardcode_pp_table and amd_powerplay_reset \u2192 hwmgr_hw_init \u2192 pp_tables_v1_0_initialize re-parses them before smu7_patch_voltage_dependency_tables_with_lookup_table uses vddInd.\nAC:L - A PowerPlay table whose ucVddInd/ucVddcInd is \u003e= vddc_lookup_table or vddgfx_lookup_table count makes smu7_patch_voltage_dependency_tables_with_lookup_table perform a deterministic entries[voltage_id].us_vdd load; voltage_id is the attacker-chosen uint8_t and no race or memory-layout gate is required.\nPR:L - pp_table is AMDGPU_DEVICE_ATTR_RW (S_IRUGO|S_IWUSR) and amdgpu_dpm_is_pp_table_allowed() enables it on SMU7 discrete ASICs (Tonga/Fiji/Polaris/VegaM); the same sysfs node was scored PR:L in CVE-2025-21780 and CVE-2026-74450 because AMD desktop/gaming udev rules routinely grant group write for overclocking tools.\nUI:N - The attacker writes the crafted PowerPlay table to pp_table themselves; no other user must plug in a GPU, mount an image, or confirm a prompt.\nS:U - The out-of-bounds us_vdd load targets the kmalloc_flex vddc_lookup_table/vddgfx_lookup_table in the host amdgpu driver and does not cross a KVM/Xen, IOMMU, or sandbox boundary.\nC:H - get_vddc_lookup_table allocates only 16 phm_ppt_v1_voltage_lookup_record slots, but voltage_id is the attacker-supplied uint8_t ucVddInd (0-255), so entries[voltage_id].us_vdd reads two kernel-heap bytes at a chosen offset up to about 2.5KB past the object, repeatable across sclk, mclk, and mm dependency entries.\nI:N - The only stores are in-bounds writes of that 16-bit millivolt into sclk_table/mclk_table/mm_table entries[entry_id].vddc or .vddgfx; those fields are not used as pointers or as further unbounded indexes, so this is not an out-of-bounds write or control-flow hijack primitive.\nA:H - voltage_id 255 walks about 2.5KB past the 16-entry lookup object and can fault on an unmapped or guard page; the same uploaded table can leave vdd_dep_on_sclk, vdd_dep_on_mclk, or mm_dep_table NULL so the -\u003ecount load oopses; garbage voltages later sent to the SMU can hang the GPU."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:06:50.344Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d9ef085114d1e3c2c1f869c0bdb275a7b358ce8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f08c001fa6e8212930d694540ae8d9d6d3fb58a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce0d8e72836c9d3710a160ad848b0f1d096075e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/745297208d31222f916cc04da313cb737b997935"
        },
        {
          "url": "https://git.kernel.org/stable/c/f925d317d84d401d642e537ea18ee12f67cb6983"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a3db9f593b643904c6cc6d8a3f211c84ca6cf8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1664327ce797e09e387dc10cbbaa5b8d76558d2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a8a05477cda6c8293e2b629495b42981dcaba32"
        }
      ],
      "title": "drm/amdgpu/pm/powerplay: bounds-check voltage index in SMU7 lookup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93178",
    "datePublished": "2026-09-17T16:12:06.631Z",
    "dateReserved": "2026-09-17T16:02:15.091Z",
    "dateUpdated": "2026-10-19T09:06:50.344Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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