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CVE-2026-98015

Status: ReceivedUnscored—

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

net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put

In mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads tt->ref_count after termtbl_mutex has been released. Two concurrent callers on the same mlx5_termtbl_handle race: one decrements ref_count to zero, removes the hash entry, and calls kfree(tt) while the other has already dropped the mutex and is about to evaluate if (!tt->ref_count), producing a use-after-free.

Fix this by capturing the result of the decrement into a stack-local last variable before dropping the mutex. The cleanup decision is now made entirely under termtbl_mutex, and tt is not touched after kfree.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux KernelAI

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-98015",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "lessThan": "e3ee194a790896fa92fea20b5385a354be2f2c12",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "lessThan": "b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "lessThan": "92f581cac93a71723456ac79ef54d9f60a251b42",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "a5833fdf53350b8b95a558fcf0056ddb1c0fe154",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "304ea40ef4561671503c36e47da44a0a31b71e36",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "lessThan": "e393789e92310d7c66f57c876101779c90816a12",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "lessThan": "18b2969073879b9cce24e1a78b118bdad54518d1",
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              "status": "affected",
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              "lessThan": "7ee07f601f8f507c9faf25c68a49396ab8950596",
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            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.3",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:29.927",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put\n\nIn mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads\ntt->ref_count after termtbl_mutex has been released.  Two concurrent\ncallers on the same mlx5_termtbl_handle race: one decrements ref_count\nto zero, removes the hash entry, and calls kfree(tt) while the other\nhas already dropped the mutex and is about to evaluate\nif (!tt->ref_count), producing a use-after-free.\n\nFix this by capturing the result of the decrement into a stack-local\nlast variable before dropping the mutex.  The cleanup decision is now\nmade entirely under termtbl_mutex, and tt is not touched after\nkfree."
    }
  ],
  "lastModified": "2026-10-03T11:18:24.657",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}