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FKIE_CVE-2026-72006

Vulnerability from fkie_nvd - Published: 2026-08-15 06:20 - Updated: 2026-08-17 06:17
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-72006",
  "lastModified": "2026-08-17T06:17:58.083",
  "metrics": {},
  "published": "2026-08-15T06:20:59.250",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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