{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93178", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.091Z", "datePublished": "2026-09-17T16:12:06.631Z", "dateUpdated": "2026-10-19T09:06:50.344Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:06:50.344Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "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 → pp_dpm_set_pp_table copies them into hardcode_pp_table and amd_powerplay_reset → hwmgr_hw_init → 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 >= 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 ->count load oopses; garbage voltages later sent to the SMU can hang the GPU." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c" ], "versions": [ { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "d9ef085114d1e3c2c1f869c0bdb275a7b358ce8b", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "6f08c001fa6e8212930d694540ae8d9d6d3fb58a", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "ce0d8e72836c9d3710a160ad848b0f1d096075e3", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "745297208d31222f916cc04da313cb737b997935", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "f925d317d84d401d642e537ea18ee12f67cb6983", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "8a3db9f593b643904c6cc6d8a3f211c84ca6cf8a", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "1664327ce797e09e387dc10cbbaa5b8d76558d2c", "status": "affected", "versionType": "git" }, { "version": "c82baa28184356a75c0157129f88af42b2e7b695", "lessThan": "3a8a05477cda6c8293e2b629495b42981dcaba32", "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/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c" ], "versions": [ { "version": "4.5", "status": "affected" }, { "version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.5", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }