cve-2022-48892
Vulnerability from cvelistv5
Published
2024-08-21 06:10
Modified
2024-11-04 12:18
Severity ?
Summary
sched/core: Fix use-after-free bug in dup_user_cpus_ptr()
Impacted products
Vendor Product Version
Linux Linux Version: 5.15
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48892",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:04:18.997658Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:06.281Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b22faa21b623",
              "status": "affected",
              "version": "07ec77a1d4e8",
              "versionType": "git"
            },
            {
              "lessThan": "7b5cc7fd1789",
              "status": "affected",
              "version": "07ec77a1d4e8",
              "versionType": "git"
            },
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              "lessThan": "87ca4f9efbd7",
              "status": "affected",
              "version": "07ec77a1d4e8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.89",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Fix use-after-free bug in dup_user_cpus_ptr()\n\nSince commit 07ec77a1d4e8 (\"sched: Allow task CPU affinity to be\nrestricted on asymmetric systems\"), the setting and clearing of\nuser_cpus_ptr are done under pi_lock for arm64 architecture. However,\ndup_user_cpus_ptr() accesses user_cpus_ptr without any lock\nprotection. Since sched_setaffinity() can be invoked from another\nprocess, the process being modified may be undergoing fork() at\nthe same time.  When racing with the clearing of user_cpus_ptr in\n__set_cpus_allowed_ptr_locked(), it can lead to user-after-free and\npossibly double-free in arm64 kernel.\n\nCommit 8f9ea86fdf99 (\"sched: Always preserve the user requested\ncpumask\") fixes this problem as user_cpus_ptr, once set, will never\nbe cleared in a task\u0027s lifetime. However, this bug was re-introduced\nin commit 851a723e45d1 (\"sched: Always clear user_cpus_ptr in\ndo_set_cpus_allowed()\") which allows the clearing of user_cpus_ptr in\ndo_set_cpus_allowed(). This time, it will affect all arches.\n\nFix this bug by always clearing the user_cpus_ptr of the newly\ncloned/forked task before the copying process starts and check the\nuser_cpus_ptr state of the source task under pi_lock.\n\nNote to stable, this patch won\u0027t be applicable to stable releases.\nJust copy the new dup_user_cpus_ptr() function over."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-04T12:18:38.519Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b22faa21b6230d5eccd233e1b7e0026a5002b287"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b5cc7fd1789ea5dbb942c9f8207b076d365badc"
        },
        {
          "url": "https://git.kernel.org/stable/c/87ca4f9efbd7cc649ff43b87970888f2812945b8"
        }
      ],
      "title": "sched/core: Fix use-after-free bug in dup_user_cpus_ptr()",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48892",
    "datePublished": "2024-08-21T06:10:24.407Z",
    "dateReserved": "2024-08-21T06:06:23.290Z",
    "dateUpdated": "2024-11-04T12:18:38.519Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48892\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-21T07:15:05.420\",\"lastModified\":\"2024-08-29T02:35:56.343\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/core: Fix use-after-free bug in dup_user_cpus_ptr()\\n\\nSince commit 07ec77a1d4e8 (\\\"sched: Allow task CPU affinity to be\\nrestricted on asymmetric systems\\\"), the setting and clearing of\\nuser_cpus_ptr are done under pi_lock for arm64 architecture. However,\\ndup_user_cpus_ptr() accesses user_cpus_ptr without any lock\\nprotection. Since sched_setaffinity() can be invoked from another\\nprocess, the process being modified may be undergoing fork() at\\nthe same time.  When racing with the clearing of user_cpus_ptr in\\n__set_cpus_allowed_ptr_locked(), it can lead to user-after-free and\\npossibly double-free in arm64 kernel.\\n\\nCommit 8f9ea86fdf99 (\\\"sched: Always preserve the user requested\\ncpumask\\\") fixes this problem as user_cpus_ptr, once set, will never\\nbe cleared in a task\u0027s lifetime. However, this bug was re-introduced\\nin commit 851a723e45d1 (\\\"sched: Always clear user_cpus_ptr in\\ndo_set_cpus_allowed()\\\") which allows the clearing of user_cpus_ptr in\\ndo_set_cpus_allowed(). This time, it will affect all arches.\\n\\nFix this bug by always clearing the user_cpus_ptr of the newly\\ncloned/forked task before the copying process starts and check the\\nuser_cpus_ptr state of the source task under pi_lock.\\n\\nNote to stable, this patch won\u0027t be applicable to stable releases.\\nJust copy the new dup_user_cpus_ptr() function over.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/core: corrige el error de use-after-free en dup_user_cpus_ptr() Desde el commit 07ec77a1d4e8 (\\\"sched: permitir que la afinidad de la CPU de la tarea se restrinja en sistemas asim\u00e9tricos\\\"), la configuraci\u00f3n y La limpieza de user_cpus_ptr se realiza en pi_lock para la arquitectura arm64. Sin embargo, dup_user_cpus_ptr() accede a user_cpus_ptr sin ninguna protecci\u00f3n de bloqueo. Dado que sched_setaffinity() puede invocarse desde otro proceso, el proceso que se est\u00e1 modificando puede estar pasando por fork() al mismo tiempo. Cuando se corre con la limpieza de user_cpus_ptr en __set_cpus_allowed_ptr_locked(), puede llevar a una liberaci\u00f3n posterior del usuario y posiblemente a una liberaci\u00f3n doble en el kernel arm64. El commit 8f9ea86fdf99 (\\\"programaci\u00f3n: conservar siempre la m\u00e1scara de CPU solicitada por el usuario\\\") soluciona este problema ya que user_cpus_ptr, una vez configurado, nunca se borrar\u00e1 durante la vida de una tarea. Sin embargo, este error se reintrodujo en el commit 851a723e45d1 (\\\"sched: borrar siempre user_cpus_ptr en do_set_cpus_allowed()\\\") que permite borrar user_cpus_ptr en do_set_cpus_allowed(). Esta vez afectar\u00e1 a todos los arcos. Corrija este error borrando siempre el user_cpus_ptr de la tarea reci\u00e9n clonada/bifurcada antes de que comience el proceso de copia y verifique el estado de user_cpus_ptr de la tarea fuente en pi_lock. Nota para las versiones estables: este parche no se aplicar\u00e1 a las versiones estables. Simplemente copie la nueva funci\u00f3n dup_user_cpus_ptr().\"}],\"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-415\"},{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"5.15.89\",\"matchCriteriaId\":\"AF60D859-5B7E-4CFA-9318-AFEFAB130E64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.7\",\"matchCriteriaId\":\"9275C81F-AE96-4CDB-AD20-7DBD36E5D909\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7b5cc7fd1789ea5dbb942c9f8207b076d365badc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/87ca4f9efbd7cc649ff43b87970888f2812945b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b22faa21b6230d5eccd233e1b7e0026a5002b287\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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