CVE-2026-98015 (GCVE-0-2026-98015)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-10-19 09:12
VLAI
Title
net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6971 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < e3ee194a790896fa92fea20b5385a354be2f2c12 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < 92f581cac93a71723456ac79ef54d9f60a251b42 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < a5833fdf53350b8b95a558fcf0056ddb1c0fe154 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < 304ea40ef4561671503c36e47da44a0a31b71e36 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < e393789e92310d7c66f57c876101779c90816a12 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < 18b2969073879b9cce24e1a78b118bdad54518d1 (git)
Affected: 10caabdaad5ace85577a453da97d1f8d3b944427 , < 7ee07f601f8f507c9faf25c68a49396ab8950596 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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-\u003eref_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-\u003eref_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."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797"
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          "url": "https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42"
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        {
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      "title": "net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98015",
    "datePublished": "2026-09-25T10:23:37.724Z",
    "dateReserved": "2026-09-25T10:19:56.069Z",
    "dateUpdated": "2026-10-19T09:12:20.637Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put",
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          }
        ],
        "id": "CVE-2026-98015",
        "lastModified": "2026-10-19T10:17:55.007",
        "metrics": {},
        "published": "2026-09-25T11:17:29.927",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-10-30T06:32:06+00:00",
      "cve": "CVE-2026-98015",
      "id": "CVE-2026-98015",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "279",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98015.json",
      "version": "3"
    }
  }
}



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