CVE-2026-45891 (GCVE-0-2026-45891)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17
VLAI
Title
net: hns3: fix double free issue for tx spare buffer
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 907676b130711fd1f627824559e92259db2061d1 , < fb6a4c376d454b425555b1b0bda36e99f56ec307 (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < 43015461662d41dcfb3bb95fadd8a2a42ad8eacf (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < 6dc10494cfe27b6f1e9adb7e293293ae39c50b7c (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < d2c785733dfb853ea0b53984c75662a1af230a94 (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < fdbccddb7e7822016601829f95de4008e193f7bc (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < c3659273860bed0c8e573b865e3769abc51225a8 (git)
Affected: 907676b130711fd1f627824559e92259db2061d1 , < 6d2f142b1e4b203387a92519d9d2e34752a79dbb (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/hisilicon/hns3/hns3_enet.c"
          ],
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              "version": "6.12.75",
              "versionType": "semver"
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              "version": "6.19.4",
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              "version": "7.0",
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          "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"
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          "url": "https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"
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    "datePublished": "2026-05-27T12:17:02.306Z",
    "dateReserved": "2026-05-13T15:03:33.083Z",
    "dateUpdated": "2026-05-27T12:17:02.306Z",
    "state": "PUBLISHED"
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      "date": "2026-05-29",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45891\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:03.183\",\"lastModified\":\"2026-05-27T14:48:31.480\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.