Vulnerability-Lookup

GHSA-6FRH-MF5H-MGW9

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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

RDMA/uverbs: Guard legacy bundles without method_elm

The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer.

Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89505"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Guard legacy bundles without method_elm\n\nThe legacy write() path dispatches through a uverbs_api_write_method, but\nthe uverbs_attr_bundle passed to provider code does not have an ioctl\nmethod element. If malformed provider input causes the common uverbs\nvalidation code to emit an error message, uverbs_get_handler_fn()\ndereferences the uninitialized method_elm pointer.\n\nInitialize method_elm explicitly for legacy bundles and make\nuverbs_get_handler_fn() return NULL when no ioctl method is present. The\nlegacy dispatcher continues to use its local write method, while the ioctl\npath continues to use the registered ioctl handler.",
  "id": "GHSA-6frh-mf5h-mgw9",
  "modified": "2026-09-11T21:31:29Z",
  "published": "2026-09-11T21:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89505"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89505 (GCVE-0-2026-89505)

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

Title

RDMA/uverbs: Guard legacy bundles without method_elm

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Guard legacy bundles without method_elm The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer. Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/edae84e5461749ed9…
https://git.kernel.org/stable/c/60a42d510113f46de…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7122ff96068a03595bde2fbafaca82ca2ed8084e , < edae84e5461749ed9adf9fcf5c6e075381040ac3 (git) Affected: 7122ff96068a03595bde2fbafaca82ca2ed8084e , < 60a42d510113f46de47e86a84bf5758597644487 (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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JSON

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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/infiniband/core/ib_core_uverbs.c",
            "drivers/infiniband/core/uverbs_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "edae84e5461749ed9adf9fcf5c6e075381040ac3",
              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "7122ff96068a03595bde2fbafaca82ca2ed8084e",
              "versionType": "git"
            }
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        },
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          "product": "Linux",
          "programFiles": [
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          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
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              "status": "unaffected",
              "version": "0",
              "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"
            }
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      ],
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                }
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Guard legacy bundles without method_elm\n\nThe legacy write() path dispatches through a uverbs_api_write_method, but\nthe uverbs_attr_bundle passed to provider code does not have an ioctl\nmethod element. If malformed provider input causes the common uverbs\nvalidation code to emit an error message, uverbs_get_handler_fn()\ndereferences the uninitialized method_elm pointer.\n\nInitialize method_elm explicitly for legacy bundles and make\nuverbs_get_handler_fn() return NULL when no ioctl method is present. The\nlegacy dispatcher continues to use its local write method, while the ioctl\npath continues to use the registered ioctl handler."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:43:52.690Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487"
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    "cveId": "CVE-2026-89505",
    "datePublished": "2026-09-11T19:43:52.690Z",
    "dateReserved": "2026-09-11T19:38:34.716Z",
    "dateUpdated": "2026-09-11T19:43:52.690Z",
    "state": "PUBLISHED"
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}

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.

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