CVE-2026-89442 (GCVE-0-2026-89442)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-10-19 08:46
VLAI
Title
platform/x86: ISST: Validate socket ID in clos_assoc ioctl
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Validate socket ID in clos_assoc ioctl isst_if_clos_assoc() validates the user-supplied socket_id with 'socket_id > topology_max_packages()', but isst_common.sst_inst[] is allocated with topology_max_packages() entries, so the valid index range is [0, topology_max_packages()). The '>' comparison lets socket_id == topology_max_packages() pass and index one entry past the array. In addition, isst_common.sst_inst[socket_id] is NULL for an in-range package that has no bound TPMI SST instance, and the pointer is used without a NULL check. Both the out-of-bounds entry and the NULL pointer are then dereferenced by map_partition_power_domain_id() and the following power_domain_info access. Reject socket_id >= topology_max_packages() and a NULL sst_inst, matching the checks already performed by get_instance().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 12a7d2cb811dd8a884dea088a2701fcb8d00136e , < c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8 (git)
Affected: 12a7d2cb811dd8a884dea088a2701fcb8d00136e , < 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 (git)
Affected: 12a7d2cb811dd8a884dea088a2701fcb8d00136e , < 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca (git)
Affected: 12a7d2cb811dd8a884dea088a2701fcb8d00136e , < 207b4dc6eb100141b122b2602504a1429a4b6558 (git)
Affected: 12a7d2cb811dd8a884dea088a2701fcb8d00136e , < a89f07db0cb95c54dac4a8406c79a04e44a73c3c (git)
guessed Create a notification for this product.
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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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": "c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8",
              "status": "affected",
              "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
              "versionType": "git"
            },
            {
              "lessThan": "0d90ab5f80e19cddfeb0c9fab47a1f34aa932075",
              "status": "affected",
              "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
              "versionType": "git"
            },
            {
              "lessThan": "82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca",
              "status": "affected",
              "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
              "versionType": "git"
            },
            {
              "lessThan": "207b4dc6eb100141b122b2602504a1429a4b6558",
              "status": "affected",
              "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
              "versionType": "git"
            },
            {
              "lessThan": "a89f07db0cb95c54dac4a8406c79a04e44a73c3c",
              "status": "affected",
              "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
              "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",
              "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",
                  "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 socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n\u0027socket_id \u003e topology_max_packages()\u0027, but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()).  The \u0027\u003e\u0027 comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check.  Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id \u003e= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through the ISST_IF_CLOS_ASSOC ioctl on /dev/isst_interface; isst_if_clos_assoc() is not invoked from network, Bluetooth, or USB processing.\nAC:L - The attacker sets punit_cpu_map=1 and socket_id equal to topology_max_packages() (one past sst_inst[]) or to an in-range unbound package (NULL sst_inst). Both are deterministic ioctl inputs with no race or victim state.\nPR:L - isst_if_open() has no capability check, and capable(CAP_SYS_ADMIN) runs only on the SET path after sst_inst is already indexed and dereferenced, so an unprivileged local user with the device fd can trigger it via GET.\nUI:N - The attacker issues the ioctl directly against /dev/isst_interface; no victim action such as mounting a filesystem or opening a file is required.\nS:U - The out-of-bounds pointer load and subsequent NULL or wild dereference stay in the kernel ISST driver and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - socket_id == topology_max_packages() reads one pointer past sst_inst[] and treats it as struct tpmi_sst_struct; map_partition_power_domain_id() and readq() follow that object, and GET copy_to_user discloses the result as a kernel-memory read primitive.\nI:H - Treating the adjacent out-of-bounds pointer as sst_inst is type confusion; the confused object supplies sst_base used for writeq() on the SET path and further structure walks, which is an exploitable kernel write primitive.\nA:H - A NULL sst_inst or garbage out-of-bounds pointer is immediately dereferenced in map_partition_power_domain_id() and the following power_domain_info access, causing a kernel oops or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:51.770Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"
        },
        {
          "url": "https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"
        },
        {
          "url": "https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"
        }
      ],
      "title": "platform/x86: ISST: Validate socket ID in clos_assoc ioctl",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89442",
    "datePublished": "2026-09-11T19:43:10.753Z",
    "dateReserved": "2026-09-11T19:38:34.703Z",
    "dateUpdated": "2026-10-19T08:46:51.770Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89442",
      "date": "2026-11-04",
      "epss": "0.00168",
      "percentile": "0.06147"
    },
    "nvd": {
      "cve": {
        "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": "c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8",
                    "status": "affected",
                    "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0d90ab5f80e19cddfeb0c9fab47a1f34aa932075",
                    "status": "affected",
                    "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca",
                    "status": "affected",
                    "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "207b4dc6eb100141b122b2602504a1429a4b6558",
                    "status": "affected",
                    "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a89f07db0cb95c54dac4a8406c79a04e44a73c3c",
                    "status": "affected",
                    "version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
                    "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",
                    "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 socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n\u0027socket_id \u003e topology_max_packages()\u0027, but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()).  The \u0027\u003e\u0027 comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check.  Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id \u003e= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance()."
          }
        ],
        "id": "CVE-2026-89442",
        "lastModified": "2026-10-19T09:17:36.200",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:24.613",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T12:20:06+00:00",
      "cve": "CVE-2026-89442",
      "id": "CVE-2026-89442",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T01:01:18Z",
      "cve": "CVE-2026-89442",
      "id": "CVE-2026-89442",
      "initial_release_date": "2026-09-15T00:59:20Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "0",
      "product_status:recommended": "69",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89442",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89442.json",
      "version": "5"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.