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",
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              "status": "affected",
              "version": "5d77dca82839ef016a93ad7acd7058b14d967752",
              "versionType": "git"
            },
            {
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              "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"
            },
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              "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": [
        {
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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",
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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",
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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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