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net/mlx5e: Fix HV VHCA stats zero-sized buffer allocation

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix HV VHCA stats zero-sized buffer allocation mlx5e_hv_vhca_stats_create() is called from mlx5e_nic_enable(), before mlx5e_open(). At that point priv->stats_nch is still zero, because it is only ever incremented in mlx5e_channel_stats_alloc(), which is reached only from mlx5e_open_channel(). mlx5e_hv_vhca_stats_buf_size() therefore returns 0, and kvzalloc(0, GFP_KERNEL) returns ZERO_SIZE_PTR ((void *)16) rather than NULL. The "if (!buf)" guard does not catch this, and mlx5e_hv_vhca_stats_create() completes "successfully" with priv->stats_agent.buf set to ZERO_SIZE_PTR. Once channels are opened (priv->stats_nch > 0) and the hypervisor enables stats reporting, mlx5e_hv_vhca_stats_work() recomputes buf_len using the new non-zero stats_nch and calls memset(buf, 0, buf_len) on ZERO_SIZE_PTR, faulting at address 0x10. Allocate the buffer based on priv->max_nch, which is set in mlx5e_priv_init() and is the upper bound on stats_nch: - Add a separate helper mlx5e_hv_vhca_stats_buf_max_size() that returns sizeof(per_ring_stats) * max(max_nch, stats_nch), and use it for the kvzalloc() in mlx5e_hv_vhca_stats_create(). - Keep mlx5e_hv_vhca_stats_buf_size() (which returns based on stats_nch) for the worker's active payload size, so the wire format (block->rings = stats_nch) and the amount of data filled by mlx5e_hv_vhca_fill_stats() are unchanged. The max(max_nch, stats_nch) guard handles the rare case where ml

Announced Source revision 1
Original source ↗

CVE-2026-72343

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72343

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "3b3a552cf88e10bb7bda88b29cf1fd8267043d50",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "5b927dcec5f1087942bf123a82e64a3f66475f01",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "22c1d5ecccf92c849bdca1556179aafc95794baf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "abc4c56427f144c96b2827a4db3b90eb5b7349a2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
        "lessThan": "25f6b929c7e379cbea7cb8caa67b49b2d1efae17",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.17"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.17",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72343

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33030 · Revision 1
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Publisher date
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