CVE-2026-45891 (GCVE-0-2026-45891)
Vulnerability from cvelistv5
Published
2026-05-27 12:17
Modified
2026-05-27 12:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix double free issue for tx spare buffer In hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure is created for rollback. However, the tx_spare pointer in the original ring handle is incorrectly left pointing to the old backup memory. Later, if memory allocation fails in hns3_init_all_ring() during the setup, the error path attempts to free all newly allocated rings. Since tx_spare contains a stale (non-NULL) pointer from the backup, it is mistaken for a newly allocated buffer and is erroneously freed, leading to a double-free of the backup memory. The root cause is that the tx_spare field was not cleared after its value was saved in tmp_rings, leaving a dangling pointer. Fix this by setting tx_spare to NULL in the original ring structure when the creation of the new `tx_spare` fails. This ensures the error cleanup path only frees genuinely newly allocated buffers.
References
Impacted products
Vendor Product Version
Linux Linux Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
Version: 907676b130711fd1f627824559e92259db2061d1
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"
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          "versions": [
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              "version": "0",
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              "version": "5.15.202",
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              "version": "6.1.165",
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              "version": "6.19.4",
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            },
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              "lessThanOrEqual": "*",
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hns3: fix double free issue for tx spare buffer\n\nIn hns3_set_ringparam(), a temporary copy (tmp_rings) of the ring structure\nis created for rollback. However, the tx_spare pointer in the original\nring handle is incorrectly left pointing to the old backup memory.\n\nLater, if memory allocation fails in hns3_init_all_ring() during the setup,\nthe error path attempts to free all newly allocated rings. Since tx_spare\ncontains a stale (non-NULL) pointer from the backup, it is mistaken for\na newly allocated buffer and is erroneously freed, leading to a double-free\nof the backup memory.\n\nThe root cause is that the tx_spare field was not cleared after its value\nwas saved in tmp_rings, leaving a dangling pointer.\n\nFix this by setting tx_spare to NULL in the original ring structure\nwhen the creation of the new `tx_spare` fails. This ensures the\nerror cleanup path only frees genuinely newly allocated buffers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:02.306Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307"
        },
        {
          "url": "https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf"
        },
        {
          "url": "https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94"
        },
        {
          "url": "https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"
        }
      ],
      "title": "net: hns3: fix double free issue for tx spare buffer",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45891",
    "datePublished": "2026-05-27T12:17:02.306Z",
    "dateReserved": "2026-05-13T15:03:33.083Z",
    "dateUpdated": "2026-05-27T12:17:02.306Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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