FKIE_CVE-2026-45891

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43015461662d41dcfb3bb95fadd8a2a42ad8eacf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d2f142b1e4b203387a92519d9d2e34752a79dbb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6dc10494cfe27b6f1e9adb7e293293ae39c50b7c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3659273860bed0c8e573b865e3769abc51225a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2c785733dfb853ea0b53984c75662a1af230a94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb6a4c376d454b425555b1b0bda36e99f56ec307
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fdbccddb7e7822016601829f95de4008e193f7bc
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{
  "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."
    }
  ],
  "id": "CVE-2026-45891",
  "lastModified": "2026-05-27T14:48:31.480",
  "metrics": {},
  "published": "2026-05-27T14:17:03.183",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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