CVE-2021-46952 (GCVE-0-2021-46952)
Vulnerability from cvelistv5
Published
2024-02-27 18:40
Modified
2025-05-04 07:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9954bf92c0cddd50a2a470be302e1c1ffdf21d42
Version: 9954bf92c0cddd50a2a470be302e1c1ffdf21d42
Version: 9954bf92c0cddd50a2a470be302e1c1ffdf21d42
Version: 9954bf92c0cddd50a2a470be302e1c1ffdf21d42
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-46952",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-02-27T20:13:18.077870Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-05T17:22:02.950Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:17:43.053Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/fs_context.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2",
              "status": "affected",
              "version": "9954bf92c0cddd50a2a470be302e1c1ffdf21d42",
              "versionType": "git"
            },
            {
              "lessThan": "2f3380121d49e829fb73ba86240c181bc32ad897",
              "status": "affected",
              "version": "9954bf92c0cddd50a2a470be302e1c1ffdf21d42",
              "versionType": "git"
            },
            {
              "lessThan": "3d0163821c035040a46d816a42c0780f0f0a30a8",
              "status": "affected",
              "version": "9954bf92c0cddd50a2a470be302e1c1ffdf21d42",
              "versionType": "git"
            },
            {
              "lessThan": "c09f11ef35955785f92369e25819bf0629df2e59",
              "status": "affected",
              "version": "9954bf92c0cddd50a2a470be302e1c1ffdf21d42",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/fs_context.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.36",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.20",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.3",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: fs_context: validate UDP retrans to prevent shift out-of-bounds\n\nFix shift out-of-bounds in xprt_calc_majortimeo(). This is caused\nby a garbage timeout (retrans) mount option being passed to nfs mount,\nin this case from syzkaller.\n\nIf the protocol is XPRT_TRANSPORT_UDP, then \u0027retrans\u0027 is a shift\nvalue for a 64-bit long integer, so \u0027retrans\u0027 cannot be \u003e= 64.\nIf it is \u003e= 64, fail the mount and return an error."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:01:04.042Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59"
        }
      ],
      "title": "NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46952",
    "datePublished": "2024-02-27T18:40:35.343Z",
    "dateReserved": "2024-02-25T13:45:52.722Z",
    "dateUpdated": "2025-05-04T07:01:04.042Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46952\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:06.517\",\"lastModified\":\"2024-11-21T06:35:00.973\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFS: fs_context: validate UDP retrans to prevent shift out-of-bounds\\n\\nFix shift out-of-bounds in xprt_calc_majortimeo(). This is caused\\nby a garbage timeout (retrans) mount option being passed to nfs mount,\\nin this case from syzkaller.\\n\\nIf the protocol is XPRT_TRANSPORT_UDP, then \u0027retrans\u0027 is a shift\\nvalue for a 64-bit long integer, so \u0027retrans\u0027 cannot be \u003e= 64.\\nIf it is \u003e= 64, fail the mount and return an error.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFS: fs_context: valida las retransmisiones UDP para evitar cambios fuera de los l\u00edmites. Corrige cambios fuera de los l\u00edmites en xprt_calc_majortimeo(). Esto se debe a que se pasa una opci\u00f3n de montaje de tiempo de espera de basura (retransmisi\u00f3n) al montaje nfs, en este caso desde syzkaller. Si el protocolo es XPRT_TRANSPORT_UDP, entonces \u0027retrans\u0027 es un valor de desplazamiento para un entero largo de 64 bits, por lo que \u0027retrans\u0027 no puede ser \u0026gt;= 64. Si es \u0026gt;= 64, falla el montaje y devuelve un error.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.6.0\",\"versionEndExcluding\":\"5.10.36\",\"matchCriteriaId\":\"9F676E27-91BA-4675-B518-89C5729CC97C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.11.20\",\"matchCriteriaId\":\"EFB425F0-C28C-4B44-8B4C-AD512AA832DE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12.0\",\"versionEndExcluding\":\"5.12.3\",\"matchCriteriaId\":\"C3814FA3-8141-4313-A852-8C4212BE12AD\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:43.053Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46952\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-02-27T20:13:18.077870Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-05T15:20:41.041Z\"}}], \"cna\": {\"title\": \"NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9954bf92c0cddd50a2a470be302e1c1ffdf21d42\", \"lessThan\": \"96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9954bf92c0cddd50a2a470be302e1c1ffdf21d42\", \"lessThan\": \"2f3380121d49e829fb73ba86240c181bc32ad897\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9954bf92c0cddd50a2a470be302e1c1ffdf21d42\", \"lessThan\": \"3d0163821c035040a46d816a42c0780f0f0a30a8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9954bf92c0cddd50a2a470be302e1c1ffdf21d42\", \"lessThan\": \"c09f11ef35955785f92369e25819bf0629df2e59\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfs/fs_context.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfs/fs_context.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2\"}, {\"url\": \"https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897\"}, {\"url\": \"https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8\"}, {\"url\": \"https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFS: fs_context: validate UDP retrans to prevent shift out-of-bounds\\n\\nFix shift out-of-bounds in xprt_calc_majortimeo(). This is caused\\nby a garbage timeout (retrans) mount option being passed to nfs mount,\\nin this case from syzkaller.\\n\\nIf the protocol is XPRT_TRANSPORT_UDP, then \u0027retrans\u0027 is a shift\\nvalue for a 64-bit long integer, so \u0027retrans\u0027 cannot be \u003e= 64.\\nIf it is \u003e= 64, fail the mount and return an error.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:01:04.042Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46952\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:01:04.042Z\", \"dateReserved\": \"2024-02-25T13:45:52.722Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:40:35.343Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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.