{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "907676b130711fd1f627824559e92259db2061d1"
            },
            {
              "fixed": "fb6a4c376d454b425555b1b0bda36e99f56ec307"
            },
            {
              "fixed": "43015461662d41dcfb3bb95fadd8a2a42ad8eacf"
            },
            {
              "fixed": "6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"
            },
            {
              "fixed": "d2c785733dfb853ea0b53984c75662a1af230a94"
            },
            {
              "fixed": "fdbccddb7e7822016601829f95de4008e193f7bc"
            },
            {
              "fixed": "c3659273860bed0c8e573b865e3769abc51225a8"
            },
            {
              "fixed": "6d2f142b1e4b203387a92519d9d2e34752a79dbb"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.14.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45891.json"
  },
  "details": "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.",
  "id": "CVE-2026-45891",
  "modified": "2026-07-08T05:38:03.886788481Z",
  "published": "2026-05-27T12:17:02.306Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45891.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45891"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "net: hns3: fix double free issue for tx spare buffer"
}