Vulnerability-Lookup

GHSA-X8Q3-8M8P-MX7V

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32

Details

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

net/mlx5: free mlx5_st_idx_data on final dealloc

Workloads that repeatedly allocate and release mkeys carrying TPH steering-tag hints (e.g. churning RDMA MRs) leak one struct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced and the kmalloc slab grows over time.

When the last reference to an ST table entry is dropped, mlx5_st_dealloc_index() removed the entry from idx_xa but the backing mlx5_st_idx_data allocation was never freed.

Free idx_data after the xa_erase() so the lifetime of the bookkeeping struct matches the lifetime of the ST entry it tracks.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-72006"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:20:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: free mlx5_st_idx_data on final dealloc\n\nWorkloads that repeatedly allocate and release mkeys carrying TPH\nsteering-tag hints (e.g. churning RDMA MRs) leak one\nstruct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced\nand the kmalloc slab grows over time.\n\nWhen the last reference to an ST table entry is dropped,\nmlx5_st_dealloc_index() removed the entry from idx_xa but the backing\nmlx5_st_idx_data allocation was never freed.\n\nFree idx_data after the xa_erase() so the lifetime of the bookkeeping\nstruct matches the lifetime of the ST entry it tracks.",
  "id": "GHSA-x8q3-8m8p-mx7v",
  "modified": "2026-08-15T06:32:08Z",
  "published": "2026-08-15T06:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72006"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-72006 (GCVE-0-2026-72006)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06

Title

net/mlx5: free mlx5_st_idx_data on final dealloc

Summary

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: free mlx5_st_idx_data on final dealloc Workloads that repeatedly allocate and release mkeys carrying TPH steering-tag hints (e.g. churning RDMA MRs) leak one struct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced and the kmalloc slab grows over time. When the last reference to an ST table entry is dropped, mlx5_st_dealloc_index() removed the entry from idx_xa but the backing mlx5_st_idx_data allocation was never freed. Free idx_data after the xa_erase() so the lifetime of the bookkeeping struct matches the lifetime of the ST entry it tracks.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/262da8b6ea03d01ee…
https://git.kernel.org/stable/c/6eb4cf2fa8997f62c…
https://git.kernel.org/stable/c/df6134b527a88b3e6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < 262da8b6ea03d01ee7ed01ad309e4c89941f6b14 (git) Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < 6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75 (git) Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < df6134b527a88b3e65ba6ae5073664af091d5fd2 (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lib/st.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "262da8b6ea03d01ee7ed01ad309e4c89941f6b14",
              "status": "affected",
              "version": "888a7776f4fb04c19bec70c737c61c2f383c6b1e",
              "versionType": "git"
            },
            {
              "lessThan": "6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75",
              "status": "affected",
              "version": "888a7776f4fb04c19bec70c737c61c2f383c6b1e",
              "versionType": "git"
            },
            {
              "lessThan": "df6134b527a88b3e65ba6ae5073664af091d5fd2",
              "status": "affected",
              "version": "888a7776f4fb04c19bec70c737c61c2f383c6b1e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lib/st.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.18.40",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: free mlx5_st_idx_data on final dealloc\n\nWorkloads that repeatedly allocate and release mkeys carrying TPH\nsteering-tag hints (e.g. churning RDMA MRs) leak one\nstruct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced\nand the kmalloc slab grows over time.\n\nWhen the last reference to an ST table entry is dropped,\nmlx5_st_dealloc_index() removed the entry from idx_xa but the backing\nmlx5_st_idx_data allocation was never freed.\n\nFree idx_data after the xa_erase() so the lifetime of the bookkeeping\nstruct matches the lifetime of the ST entry it tracks."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:06:27.714Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14"
        },
        {
          "url": "https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75"
        },
        {
          "url": "https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2"
        }
      ],
      "title": "net/mlx5: free mlx5_st_idx_data on final dealloc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72006",
    "datePublished": "2026-08-15T05:51:36.635Z",
    "dateReserved": "2026-08-09T03:40:39.899Z",
    "dateUpdated": "2026-08-17T05:06:27.714Z",
    "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.

Action not permitted

GHSA-X8Q3-8M8P-MX7V

CVE-2026-72006 (GCVE-0-2026-72006)

Tags

Sightings

Nomenclature