fkie_cve-2021-47427
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2024-12-31 20:04
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix iscsi_task use after free Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but then also changed the handling of the case where we detect an already completed task where we now end up doing a goto to the common put/cleanup code. This results in a iscsi_task use after free, because the common cleanup code will do a put on the iscsi_task. This reverts the goto and moves the iscsi_get_conn() to after we've checked if the iscsi_task is valid.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0212F5AF-8179-4A29-9B5A-E9060BD1F240",
              "versionEndExcluding": "5.14.12",
              "versionStartIncluding": "5.14",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644",
              "vulnerable": true
            },
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              "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56",
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            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: iscsi: Fix iscsi_task use after free\n\nCommit d39df158518c (\"scsi: iscsi: Have abort handler get ref to conn\")\nadded iscsi_get_conn()/iscsi_put_conn() calls during abort handling but\nthen also changed the handling of the case where we detect an already\ncompleted task where we now end up doing a goto to the common put/cleanup\ncode. This results in a iscsi_task use after free, because the common\ncleanup code will do a put on the iscsi_task.\n\nThis reverts the goto and moves the iscsi_get_conn() to after we\u0027ve checked\nif the iscsi_task is valid."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: iscsi: corrige el uso after free de iscsi_task. Confirmaci\u00f3n d39df158518c (\"scsi: iscsi: Have abort handler get ref to conn\") se agregaron llamadas iscsi_get_conn()/iscsi_put_conn() durante el manejo de abortos pero luego tambi\u00e9n cambi\u00f3 el manejo del caso en el que detectamos una tarea ya completada y ahora terminamos haciendo un acceso al c\u00f3digo com\u00fan de put/cleanup. Esto da como resultado un uso de iscsi_task despu\u00e9s de la liberaci\u00f3n, porque el c\u00f3digo de limpieza com\u00fan colocar\u00e1 iscsi_task. Esto revierte el ir a y mueve iscsi_get_conn() a despu\u00e9s de haber verificado si iscsi_task es v\u00e1lido."
    }
  ],
  "id": "CVE-2021-47427",
  "lastModified": "2024-12-31T20:04:00.207",
  "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": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-21T15:15:28.117",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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