cve-2024-42234
Vulnerability from cvelistv5
Published
2024-08-07 15:14
Modified
2024-12-19 09:14
Severity ?
Summary
mm: fix crashes from deferred split racing folio migration
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be9581ea8c058d81154251cb0695987098996cadPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc7facce686b64201dbf0b9614cc1d0bfad70010Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42234",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:14:10.736603Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:32.409Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/memcontrol.c",
            "mm/migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fc7facce686b64201dbf0b9614cc1d0bfad70010",
              "status": "affected",
              "version": "9bcef5973e31020e5aa8571eb994d67b77318356",
              "versionType": "git"
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/memcontrol.c",
            "mm/migrate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.9.10",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: fix crashes from deferred split racing folio migration\n\nEven on 6.10-rc6, I\u0027ve been seeing elusive \"Bad page state\"s (often on\nflags when freeing, yet the flags shown are not bad: PG_locked had been\nset and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from\ndeferred_split_scan()\u0027s folio_put(), and a variety of other BUG and WARN\nsymptoms implying double free by deferred split and large folio migration.\n\n6.7 commit 9bcef5973e31 (\"mm: memcg: fix split queue list crash when large\nfolio migration\") was right to fix the memcg-dependent locking broken in\n85ce2c517ade (\"memcontrol: only transfer the memcg data for migration\"),\nbut missed a subtlety of deferred_split_scan(): it moves folios to its own\nlocal list to work on them without split_queue_lock, during which time\nfolio-\u003e_deferred_list is not empty, but even the \"right\" lock does nothing\nto secure the folio and the list it is on.\n\nFortunately, deferred_split_scan() is careful to use folio_try_get(): so\nfolio_migrate_mapping() can avoid the race by folio_undo_large_rmappable()\nwhile the old folio\u0027s reference count is temporarily frozen to 0 - adding\nsuch a freeze in the !mapping case too (originally, folio lock and\nunmapping and no swap cache left an anon folio unreachable, so no freezing\nwas needed there: but the deferred split queue offers a way to reach it)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:14:32.963Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/fc7facce686b64201dbf0b9614cc1d0bfad70010"
        },
        {
          "url": "https://git.kernel.org/stable/c/be9581ea8c058d81154251cb0695987098996cad"
        }
      ],
      "title": "mm: fix crashes from deferred split racing folio migration",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42234",
    "datePublished": "2024-08-07T15:14:24.467Z",
    "dateReserved": "2024-07-30T07:40:12.252Z",
    "dateUpdated": "2024-12-19T09:14:32.963Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42234\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-07T16:15:46.390\",\"lastModified\":\"2024-08-08T14:55:29.913\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm: fix crashes from deferred split racing folio migration\\n\\nEven on 6.10-rc6, I\u0027ve been seeing elusive \\\"Bad page state\\\"s (often on\\nflags when freeing, yet the flags shown are not bad: PG_locked had been\\nset and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from\\ndeferred_split_scan()\u0027s folio_put(), and a variety of other BUG and WARN\\nsymptoms implying double free by deferred split and large folio migration.\\n\\n6.7 commit 9bcef5973e31 (\\\"mm: memcg: fix split queue list crash when large\\nfolio migration\\\") was right to fix the memcg-dependent locking broken in\\n85ce2c517ade (\\\"memcontrol: only transfer the memcg data for migration\\\"),\\nbut missed a subtlety of deferred_split_scan(): it moves folios to its own\\nlocal list to work on them without split_queue_lock, during which time\\nfolio-\u003e_deferred_list is not empty, but even the \\\"right\\\" lock does nothing\\nto secure the folio and the list it is on.\\n\\nFortunately, deferred_split_scan() is careful to use folio_try_get(): so\\nfolio_migrate_mapping() can avoid the race by folio_undo_large_rmappable()\\nwhile the old folio\u0027s reference count is temporarily frozen to 0 - adding\\nsuch a freeze in the !mapping case too (originally, folio lock and\\nunmapping and no swap cache left an anon folio unreachable, so no freezing\\nwas needed there: but the deferred split queue offers a way to reach it).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mm: corrige fallas debido a la migraci\u00f3n diferida de folios de ejecuciones divididas Incluso en 6.10-rc6, he estado viendo \\\"estados de p\u00e1gina incorrectos\\\" esquivos (a menudo en indicadores al liberar, pero los indicadores mostrados no son malos: \u00bfPG_locked se hab\u00eda configurado y borrado?), y VM_BUG_ON_PAGE(page_ref_count(page) == 0)s de folio_put() de deferred_split_scan(), y una variedad de otros s\u00edntomas de ERROR y ADVERTENCIA que implican doble liberaci\u00f3n por divisi\u00f3n diferida y migraci\u00f3n de folios grandes. 6.7 el commit 9bcef5973e31 (\\\"mm: memcg: corregir el bloqueo de la lista de colas divididas cuando se migra un folio grande\\\") ten\u00eda raz\u00f3n al corregir el bloqueo dependiente de memcg roto en 85ce2c517ade (\\\"memcontrol: transferir solo los datos de memcg para la migraci\u00f3n\\\"), pero omiti\u00f3 una sutileza de deferred_split_scan(): mueve las publicaciones a su propia lista local para trabajar en ellas sin split_queue_lock, tiempo durante el cual folio-\u0026gt;_deferred_list no est\u00e1 vac\u00edo, pero ni siquiera el bloqueo \\\"derecho\\\" hace nada para proteger la publicaci\u00f3n y la lista en la que se encuentra. Afortunadamente, deferred_split_scan() tiene cuidado al usar folio_try_get(): por lo que folio_migrate_mapping() puede evitar la ejecuci\u00f3n mediante folio_undo_large_rmappable() mientras el recuento de referencias de la publicaci\u00f3n anterior se congela temporalmente en 0; agregando dicha congelaci\u00f3n tambi\u00e9n en el caso de !mapping (originalmente, El bloqueo y la desasignaci\u00f3n de folios y la falta de cach\u00e9 de intercambio dejaron un folio an\u00f3nimo inalcanzable, por lo que no fue necesario congelarlo all\u00ed: pero la cola dividida diferida ofrece una forma de acceder a \u00e9l).\"}],\"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:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.9.10\",\"matchCriteriaId\":\"AB2E8DEC-CFD5-4C2B-981D-E7E45A36C352\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/be9581ea8c058d81154251cb0695987098996cad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc7facce686b64201dbf0b9614cc1d0bfad70010\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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