Vulnerability-Lookup

FKIE_CVE-2026-89443

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19

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: platform/x86: ISST: Validate level in perf mask ioctls isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the user-provided level as an index into perf_levels[] via _read_pp_level_info() and _read_bf_level_info(), but neither helper validates it first. The adjacent level-info helpers reject levels above max_level before reading the same per-level register block. Add the same bounds checks to the mask helpers, and reject disabled SST-PP levels in isst_if_get_perf_level_mask() to match isst_if_get_perf_level_info(). This prevents out-of-bounds reads from the per-level offset table on invalid ioctl input.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "1a8bab5ceee1a42a78de12d3d69f67516a20588e",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "1889a9156553f0692acd57caf15e877baace1a01",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "d19385624bdfb577db9c94bb8879992fd5e17bcd",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "80e0d353c86a9a168ad6d213f494796294381538",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nplatform/x86: ISST: Validate level in perf mask ioctls\n\nisst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the\nuser-provided level as an index into perf_levels[] via\n_read_pp_level_info() and _read_bf_level_info(), but neither helper\nvalidates it first.\n\nThe adjacent level-info helpers reject levels above max_level before\nreading the same per-level register block. Add the same bounds checks to\nthe mask helpers, and reject disabled SST-PP levels in\nisst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().\n\nThis prevents out-of-bounds reads from the per-level offset table on\ninvalid ioctl input."
    }
  ],
  "id": "CVE-2026-89443",
  "lastModified": "2026-09-14T13:19:01.547",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:19:24.737",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-89443 (GCVE-0-2026-89443)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 11:59

Title

platform/x86: ISST: Validate level in perf mask ioctls

Summary

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/beb22ebf76c0415f2…
https://git.kernel.org/stable/c/1a8bab5ceee1a42a7…
https://git.kernel.org/stable/c/1889a9156553f0692…
https://git.kernel.org/stable/c/d19385624bdfb577d…
https://git.kernel.org/stable/c/80e0d353c86a9a168…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 , < beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68 (git) Affected: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 , < 1a8bab5ceee1a42a78de12d3d69f67516a20588e (git) Affected: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 , < 1889a9156553f0692acd57caf15e877baace1a01 (git) Affected: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 , < d19385624bdfb577db9c94bb8879992fd5e17bcd (git) Affected: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 , < 80e0d353c86a9a168ad6d213f494796294381538 (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "1a8bab5ceee1a42a78de12d3d69f67516a20588e",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "1889a9156553f0692acd57caf15e877baace1a01",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "d19385624bdfb577db9c94bb8879992fd5e17bcd",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            },
            {
              "lessThan": "80e0d353c86a9a168ad6d213f494796294381538",
              "status": "affected",
              "version": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate level in perf mask ioctls\n\nisst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the\nuser-provided level as an index into perf_levels[] via\n_read_pp_level_info() and _read_bf_level_info(), but neither helper\nvalidates it first.\n\nThe adjacent level-info helpers reject levels above max_level before\nreading the same per-level register block. Add the same bounds checks to\nthe mask helpers, and reject disabled SST-PP levels in\nisst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().\n\nThis prevents out-of-bounds reads from the per-level offset table on\ninvalid ioctl input."
        }
      ],
      "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 bug is reached only via local ioctl(ISST_IF_GET_PERF_LEVEL_CPU_MASK or ISST_IF_GET_BASE_FREQ_CPU_MASK) on /dev/isst_interface, dispatched through isst_if_def_ioctl() to the TPMI SST helpers; there is no network, Bluetooth, or physical-device path into these functions.\nAC:L - The attacker fully controls the ioctl argument, including the 8-bit level used as perf_levels[level] with no pre-fix bounds check; the out-of-bounds table read and following MMIO readq() occur deterministically, with no race or attacker-uncontrollable memory layout required.\nPR:L - isst_if_open() and both GET mask ioctls perform no capable() check; CAP_SYS_ADMIN is required only for SST write/set commands, so a local process that can open /dev/isst_interface can reach this read path without init-namespace admin capabilities.\nUI:N - The attacker opens /dev/isst_interface and issues the crafted ioctl from their own process; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The out-of-bounds kernel/MMIO read and any resulting oops stay within the host kernel security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - User-supplied level (0-255) indexes perf_levels[] (at most 8 entries), reading adjacent heap as a signed mmio_offset that is then used in readq(); the 64-bit result is copied to userspace when punit_cpu_map is set, an out-of-bounds read rated High unless strictly a few bytes.\nI:N - Both helpers only issue MMIO readq() and copy_to_user of the resulting mask; there is no writeq, heap write, type confusion, or control-flow hijack primitive on this path.\nA:H - sst_base is a bounded ioremap from devm_ioremap_resource(); a heap-derived mmio_offset can drive readq() outside that mapping and oops, and the perf_levels[] over-read itself can fault on hardened kernels; any kernel crash is High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:53.518Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01"
        },
        {
          "url": "https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538"
        }
      ],
      "title": "platform/x86: ISST: Validate level in perf mask ioctls",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89443",
    "datePublished": "2026-09-11T19:43:11.407Z",
    "dateReserved": "2026-09-11T19:38:34.704Z",
    "dateUpdated": "2026-09-14T11:59:53.518Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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