CVE-2026-98015 (GCVE-0-2026-98015)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
Version: 10caabdaad5ace85577a453da97d1f8d3b944427
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e3ee194a790896fa92fea20b5385a354be2f2c12",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "92f581cac93a71723456ac79ef54d9f60a251b42",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "a5833fdf53350b8b95a558fcf0056ddb1c0fe154",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "304ea40ef4561671503c36e47da44a0a31b71e36",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "e393789e92310d7c66f57c876101779c90816a12",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "18b2969073879b9cce24e1a78b118bdad54518d1",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            },
            {
              "lessThan": "7ee07f601f8f507c9faf25c68a49396ab8950596",
              "status": "affected",
              "version": "10caabdaad5ace85577a453da97d1f8d3b944427",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\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": {
        "dateUpdated": "2026-10-19T09:12:20.637Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797"
        },
        {
          "url": "https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154"
        },
        {
          "url": "https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36"
        },
        {
          "url": "https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12"
        },
        {
          "url": "https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596"
        }
      ],
      "title": "net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.