FKIE_CVE-2026-64122

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover mlx5e_tx_reporter_timeout_recover() accesses sq->netdev after mlx5e_safe_reopen_channels() has torn down and freed the channel (and its embedded SQs). Replace the three sq->netdev references with priv->netdev which is safe because priv outlives channel teardown. The netdev_err() call already used priv->netdev for this reason; make the trylock/unlock and health_channel_eq_recover calls consistent. This fixes the following KASAN splat: BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core] Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277 Call Trace: mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core] devlink_health_reporter_recover+0xa2/0x150 devlink_health_report+0x254/0x7c0 mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core] mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core] process_one_work+0x677/0xf20 worker_thread+0x51f/0xd90 kthread+0x3a5/0x810 ret_from_fork+0x208/0x400 ret_from_fork_asm+0x1a/0x30
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1604a2d68414aa4cc34faac0b7faa9c14455e8d3",
              "status": "affected",
              "version": "4329514c61abefe4961541b128c549b017bab5ad",
              "versionType": "git"
            },
            {
              "lessThan": "152295aa7dc2c5e046606f7dadc84fce41136446",
              "status": "affected",
              "version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9",
              "versionType": "git"
            },
            {
              "lessThan": "7d260c5d2d89eb2c8c528d54b576b3aae3e20231",
              "status": "affected",
              "version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "63f9d5fb4d8040077df801ca3270e2f02d55e0d9",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.34",
              "status": "affected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover\n\nmlx5e_tx_reporter_timeout_recover() accesses sq-\u003enetdev after\nmlx5e_safe_reopen_channels() has torn down and freed the channel (and\nits embedded SQs). Replace the three sq-\u003enetdev references with\npriv-\u003enetdev which is safe because priv outlives channel teardown.\n\nThe netdev_err() call already used priv-\u003enetdev for this reason; make\nthe trylock/unlock and health_channel_eq_recover calls consistent.\n\nThis fixes the following KASAN splat:\n\n  BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n  Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277\n\n  Call Trace:\n   mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n   devlink_health_reporter_recover+0xa2/0x150\n   devlink_health_report+0x254/0x7c0\n   mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]\n   mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]\n   process_one_work+0x677/0xf20\n   worker_thread+0x51f/0xd90\n   kthread+0x3a5/0x810\n   ret_from_fork+0x208/0x400\n   ret_from_fork_asm+0x1a/0x30"
    }
  ],
  "id": "CVE-2026-64122",
  "lastModified": "2026-07-20T15:17:10.777",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:53.790",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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