{
  "id": "CVE-2021-47081",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-03-01T22:15:47.483",
  "lastModified": "2024-12-09T18:45:24.617",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhabanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory\n\nOur code analyzer reported a uaf.\n\nIn gaudi_memset_device_memory, cb is get via hl_cb_kernel_create()\nwith 2 refcount.\nIf hl_cs_allocate_job() failed, the execution runs into release_cb\nbranch. One ref of cb is dropped by hl_cb_put(cb) and could be freed\nif other thread also drops one ref. Then cb is used by cb->id later,\nwhich is a potential uaf.\n\nMy patch add a variable 'id' to accept the value of cb->id before the\nhl_cb_put(cb) is called, to avoid the potential uaf."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: habanalabs/gaudi: Corregir un uso potencial despu\u00e9s de liberar en gaudi_memset_device_memory Nuestro analizador de c\u00f3digo report\u00f3 un uaf. En gaudi_memset_device_memory, cb se obtiene a trav\u00e9s de hl_cb_kernel_create() con 2 refcount. Si hl_cs_allocate_job() falla, la ejecuci\u00f3n se ejecuta en la rama release_cb. hl_cb_put(cb) elimina una referencia de cb y podr\u00eda liberarse si otro hilo tambi\u00e9n elimina una referencia. Luego, cb->id usa cb m\u00e1s tarde, que es un uaf potencial. Mi parche agrega una variable 'id' para aceptar el valor de cb->id antes de llamar a hl_cb_put(cb), para evitar el potencial uaf."
    }
  ],
  "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:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.12",
              "versionEndExcluding": "5.12.7",
              "matchCriteriaId": "13460FFE-8AA9-4F1C-963C-30982D8858D1"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ]
    }
  ]
}