FKIE_CVE-2021-47248

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
To clipboard 

{
  "affected": [
    {
      "affectedData": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp.c",
            "net/ipv6/udp.c"
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          "vendor": "Linux",
          "versions": [
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            },
            {
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              "status": "affected",
              "version": "5d77dca82839ef016a93ad7acd7058b14d967752",
              "versionType": "git"
            },
            {
              "lessThan": "a8b897c7bcd47f4147d066e22cc01d1026d7640e",
              "status": "affected",
              "version": "5d77dca82839ef016a93ad7acd7058b14d967752",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp.c",
            "net/ipv6/udp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.274",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.238",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6B5A1555-2CC4-4652-AD96-3529D26B3447",
              "versionEndExcluding": "4.9.274",
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              "matchCriteriaId": "CF351855-2437-4CF5-AD7C-BDFA51F27683",
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              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix race between close() and udp_abort()\n\nKaustubh reported and diagnosed a panic in udp_lib_lookup().\nThe root cause is udp_abort() racing with close(). Both\nracing functions acquire the socket lock, but udp{v6}_destroy_sock()\nrelease it before performing destructive actions.\n\nWe can\u0027t easily extend the socket lock scope to avoid the race,\ninstead use the SOCK_DEAD flag to prevent udp_abort from doing\nany action when the critical race happens.\n\nDiagnosed-and-tested-by: Kaustubh Pandey \u003ckapandey@codeaurora.org\u003e"
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: udp: corrige la ejecuci\u00f3n entre close() y udp_abort(). Kaustubh inform\u00f3 y diagnostic\u00f3 un p\u00e1nico en udp_lib_lookup(). La causa principal es que udp_abort() compite con close(). Ambas funciones de ejecuci\u00f3n adquieren el bloqueo del socket, pero udp{v6}_destroy_sock() lo libera antes de realizar acciones destructivas. No podemos extender f\u00e1cilmente el alcance del bloqueo del socket para evitar la ejecuci\u00f3n; en su lugar, usamos el indicador SOCK_DEAD para evitar que udp_abort realice alguna acci\u00f3n cuando ocurre la ejecuci\u00f3n cr\u00edtica. Diagnosticado y probado por: Kaustubh Pandey "
    }
  ],
  "id": "CVE-2021-47248",
  "lastModified": "2026-08-04T10:16:55.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47248",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-23T18:04:43.420239Z",
          "version": "2.0.3"
        }
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  },
  "published": "2024-05-21T15:15:13.780",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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.

Sightings

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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.
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  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.