CVE-2023-53998 (GCVE-0-2023-53998)
Vulnerability from cvelistv5
Published
2025-12-24 10:55
Modified
2025-12-24 10:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: hwrng: virtio - Fix race on data_avail and actual data The virtio rng device kicks off a new entropy request whenever the data available reaches zero. When a new request occurs at the end of a read operation, that is, when the result of that request is only needed by the next reader, then there is a race between the writing of the new data and the next reader. This is because there is no synchronisation whatsoever between the writer and the reader. Fix this by writing data_avail with smp_store_release and reading it with smp_load_acquire when we first enter read. The subsequent reads are safe because they're either protected by the first load acquire, or by the completion mechanism. Also remove the redundant zeroing of data_idx in random_recv_done (data_idx must already be zero at this point) and data_avail in request_entropy (ditto).
References
Impacted products
Vendor Product Version
Linux Linux Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
Version: f7f510ec195781c857ab76366a3e1c59e1caae42
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/hw_random/virtio-rng.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "241ef15776a7c8505008db689175b320d345ecd3",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "a43bcb0b661cbbf3ad797d2aee6b6fd06b8fc69d",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "77471e4912d3960dafe141e268c44be8024fe4dc",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "c76d991b6f01a5d931e7053a73bc9524975a5215",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "22c30022cde6e2c88612b3a499223cfa912f1bc7",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "318657b4c2077289659f1cd9e2a34f6a3b208e3e",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "2fc91f156b3f3446a1bce80cf4adedcbf41271c2",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            },
            {
              "lessThan": "ac52578d6e8d300dd50f790f29a24169b1edd26c",
              "status": "affected",
              "version": "f7f510ec195781c857ab76366a3e1c59e1caae42",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/hw_random/virtio-rng.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
            {
              "lessThan": "2.6.26",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.291",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.251",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.121",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.291",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.251",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.188",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.121",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.39",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.13",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.4",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwrng: virtio - Fix race on data_avail and actual data\n\nThe virtio rng device kicks off a new entropy request whenever the\ndata available reaches zero.  When a new request occurs at the end\nof a read operation, that is, when the result of that request is\nonly needed by the next reader, then there is a race between the\nwriting of the new data and the next reader.\n\nThis is because there is no synchronisation whatsoever between the\nwriter and the reader.\n\nFix this by writing data_avail with smp_store_release and reading\nit with smp_load_acquire when we first enter read.  The subsequent\nreads are safe because they\u0027re either protected by the first load\nacquire, or by the completion mechanism.\n\nAlso remove the redundant zeroing of data_idx in random_recv_done\n(data_idx must already be zero at this point) and data_avail in\nrequest_entropy (ditto)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:55:34.856Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/241ef15776a7c8505008db689175b320d345ecd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a43bcb0b661cbbf3ad797d2aee6b6fd06b8fc69d"
        },
        {
          "url": "https://git.kernel.org/stable/c/77471e4912d3960dafe141e268c44be8024fe4dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c76d991b6f01a5d931e7053a73bc9524975a5215"
        },
        {
          "url": "https://git.kernel.org/stable/c/22c30022cde6e2c88612b3a499223cfa912f1bc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/318657b4c2077289659f1cd9e2a34f6a3b208e3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fc91f156b3f3446a1bce80cf4adedcbf41271c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac52578d6e8d300dd50f790f29a24169b1edd26c"
        }
      ],
      "title": "hwrng: virtio - Fix race on data_avail and actual data",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53998",
    "datePublished": "2025-12-24T10:55:34.856Z",
    "dateReserved": "2025-12-24T10:53:46.176Z",
    "dateUpdated": "2025-12-24T10:55:34.856Z",
    "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.