FKIE_CVE-2021-47295

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/372ae77cf11d11fb118cbe2d37def9dd5f826abd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3abebc503a5148072052c229c6b04b329a420ecd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53af9c793f644d5841d84d8e0ad83bd7ab47f3e0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a6fb69bbcb21e9ce13bdf18c008c268874f0480
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c183dc0af472dec33d2c0786a5e356baa8cad19
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.14
linux linux_kernel 5.14
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_tcindex.c"
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            },
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.13.6",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.100",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.18",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.2.5",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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          ],
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          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "status": "affected",
              "version": "331b72922c5f",
              "versionType": "custom"
            }
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        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
            {
              "lessThan": "8e9662fde6d6",
              "status": "affected",
              "version": "331b72922c5f",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "status": "affected",
              "version": "331b72922c5f",
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          "product": "linux_kernel",
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
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          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "status": "unaffected",
              "version": "5.4.136",
              "versionType": "custom"
            }
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        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
            {
              "lessThanOrEqual": "5.11",
              "status": "unaffected",
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              "versionType": "custom"
            }
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        },
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          ],
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          "product": "linux_kernel",
          "vendor": "linux",
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              "status": "unaffected",
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      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "5.4.136",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix memory leak in tcindex_partial_destroy_work\n\nSyzbot reported memory leak in tcindex_set_parms(). The problem was in\nnon-freed perfect hash in tcindex_partial_destroy_work().\n\nIn tcindex_set_parms() new tcindex_data is allocated and some fields from\nold one are copied to new one, but not the perfect hash. Since\ntcindex_partial_destroy_work() is the destroy function for old\ntcindex_data, we need to free perfect hash to avoid memory leak."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: sched: corrige la p\u00e9rdida de memoria en tcindex_partial_destroy_work Syzbot inform\u00f3 una p\u00e9rdida de memoria en tcindex_set_parms(). El problema estaba en el hash perfecto no liberado en tcindex_partial_destroy_work(). En tcindex_set_parms() se asigna un nuevo tcindex_data y algunos campos del anterior se copian al nuevo, pero no el hash perfecto. Dado que tcindex_partial_destroy_work() es la funci\u00f3n de destrucci\u00f3n del antiguo tcindex_data, necesitamos liberar un hash perfecto para evitar p\u00e9rdidas de memoria."
    }
  ],
  "id": "CVE-2021-47295",
  "lastModified": "2026-06-17T04:17:07.600",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47295",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-06T17:36:31.882320Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:17.400",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b"
    },
    {
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    },
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    },
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    },
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    },
    {
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    },
    {
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      "tags": [
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      ],
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    },
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      "tags": [
        "Patch"
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    },
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1"
    },
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      "tags": [
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      ],
      "url": "https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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Sightings

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