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GHSA-X2RF-Q423-6X9J

Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-25 06:30

Details

In the Linux kernel, the following vulnerability has been resolved:

ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()

Fix use-after-free issue in acpi_ds_terminate_control_method() by clearing references to method locals and arguments.

Severity

8.4 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-97455"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T17:17:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Fix use-after-free in acpi_ds_terminate_control_method()\n\nFix use-after-free issue in acpi_ds_terminate_control_method() by\nclearing references to method locals and arguments.",
  "id": "GHSA-x2rf-q423-6x9j",
  "modified": "2026-09-25T06:30:31Z",
  "published": "2026-09-24T18:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97455"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/945e87267cfd90937b3c637f87324cbb56998b72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe7b3d3b7490c2c0119f2d84fa33996dcbc71042"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-97455 (GCVE-0-2026-97455)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:04 – Updated: 2026-09-25 05:10

Title

ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()

Summary

In the Linux kernel, the following vulnerability has been resolved: ACPICA: Fix use-after-free in acpi_ds_terminate_control_method() Fix use-after-free issue in acpi_ds_terminate_control_method() by clearing references to method locals and arguments.

Severity

8.4 (High)


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

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/fe7b3d3b7490c2c01…
https://git.kernel.org/stable/c/ef5a8d939c1e5b36e…
https://git.kernel.org/stable/c/945e87267cfd90937…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fe7b3d3b7490c2c0119f2d84fa33996dcbc71042 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 945e87267cfd90937b3c637f87324cbb56998b72 (git) Affected: 0 , < 6.12.111 (semver) Affected: 0 , < 6.18.53 (semver)
Linux	Linux	Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/acpica/dsmethod.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe7b3d3b7490c2c0119f2d84fa33996dcbc71042",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "945e87267cfd90937b3c637f87324cbb56998b72",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.111",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.53",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/acpica/dsmethod.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Fix use-after-free in acpi_ds_terminate_control_method()\n\nFix use-after-free issue in acpi_ds_terminate_control_method() by\nclearing references to method locals and arguments."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The data that becomes walk_state-\u003ereturn_desc is AML RefOf(Local/Arg) in the platform DSDT/SSDT. acpi_ex_get_object_reference builds that ACPI_REFCLASS_REFOF; acpi_ps_parse_aml then calls the patched acpi_ds_terminate_control_method from acpi_ns_execute_table (acpi_load_tables) or acpi_ps_execute_method (acpi_evaluate_object). Those tables are local firmware, not a network protocol message.\nAC:L - The table author emits Return(RefOf(LocalN)) or Return(RefOf(ArgN)); acpi_ex_get_object_reference sets reference.object to \u0026walk_state-\u003elocal_variables[i] or \u0026walk_state-\u003earguments[i]. acpi_ds_terminate_control_method then acpi_ds_method_data_delete_all, acpi_ps_parse_aml still forwards return_desc, and acpi_ds_delete_walk_state frees the node. That sequence is deterministic with no race.\nPR:N - acpi_bus_init calls acpi_load_tables \u2192 acpi_tb_load_namespace \u2192 acpi_ns_load_table \u2192 acpi_ns_execute_table with no uid or capability check. Module-level AML that invokes a nested method returning RefOf(Local/Arg), with the caller Store/DerefOf using that value, hits acpi_ds_terminate_control_method at boot before any account exists.\nUI:N - acpi_ns_execute_table runs that nested Return(RefOf(Local/Arg)) automatically during acpi_load_tables in acpi_bus_init at power-on; the victim does not mount media, open a file, or otherwise interact.\nS:U - The dangling ACPI_REFCLASS_REFOF points at the embedded local_variables[]/arguments[] acpi_namespace_node inside the kmalloc\u0027d acpi_walk_state freed by acpi_ds_delete_walk_state; that is host ACPICA heap corruption, not a KVM/Xen, IOMMU, or sandbox crossing.\nC:H - After acpi_ds_delete_walk_state, acpi_ns_resolve_references reads node-\u003eobject from the freed local/arg pseudo-node, and a parent DerefOf uses operand[0]-\u003ereference.object the same way; that use-after-free of the walk_state slab is an arbitrary kernel-memory read, not a few-byte leak.\nI:H - A parent Store to the returned RefOf calls acpi_ex_store_object_to_node on the dangling node, and acpi_ns_resolve_references does acpi_ut_add_reference on node-\u003eobject taken from freed walk_state memory; spraying that slab yields a write/refcount primitive and control-flow hijack.\nA:H - acpi_ds_delete_walk_state frees the walk_state while return_desc still aliases its local_variables[]/arguments[] nodes; later ns_resolve_references or DerefOf/Store through that pointer oopses or panics, and any use-after-free is Availability High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T05:10:47.616Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fe7b3d3b7490c2c0119f2d84fa33996dcbc71042"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3"
        },
        {
          "url": "https://git.kernel.org/stable/c/945e87267cfd90937b3c637f87324cbb56998b72"
        }
      ],
      "title": "ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97455",
    "datePublished": "2026-09-24T16:04:11.922Z",
    "dateReserved": "2026-09-24T14:53:16.871Z",
    "dateUpdated": "2026-09-25T05:10:47.616Z",
    "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.

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.
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GHSA-X2RF-Q423-6X9J

CVE-2026-97455 (GCVE-0-2026-97455)

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