cve-2024-36943
Vulnerability from cvelistv5
Published
2024-05-30 15:35
Modified
2024-11-05 09:28
Severity ?
Summary
fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4
Impacted products
Vendor Product Version
Linux Linux Version: 6.7
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-36943",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-05T18:15:10.001170Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-05T18:17:48.241Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T03:43:50.375Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/proc/task_mmu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "74b3d66f91d9",
              "status": "affected",
              "version": "52526ca7fdb9",
              "versionType": "git"
            },
            {
              "lessThan": "c70dce4982ce",
              "status": "affected",
              "version": "52526ca7fdb9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/proc/task_mmu.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"
            },
            {
              "lessThanOrEqual": "6.8.*",
              "status": "unaffected",
              "version": "6.8.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.9",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\n\nmake_uffd_wp_pte() was previously doing:\n\n  pte = ptep_get(ptep);\n  ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);\n\nBut if another thread accessed or dirtied the pte between the first 2\ncalls, this could lead to loss of that information.  Since\nptep_modify_prot_start() gets and clears atomically, the following is the\ncorrect pattern and prevents any possible race.  Any access after the\nfirst call would see an invalid pte and cause a fault:\n\n  pte = ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-05T09:28:31.895Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"
        },
        {
          "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"
        }
      ],
      "title": "fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36943",
    "datePublished": "2024-05-30T15:35:42.119Z",
    "dateReserved": "2024-05-30T15:25:07.073Z",
    "dateUpdated": "2024-11-05T09:28:31.895Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36943\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:17.307\",\"lastModified\":\"2024-11-21T09:22:52.417\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\\n\\nmake_uffd_wp_pte() was previously doing:\\n\\n  pte = ptep_get(ptep);\\n  ptep_modify_prot_start(ptep);\\n  pte = pte_mkuffd_wp(pte);\\n  ptep_modify_prot_commit(ptep, pte);\\n\\nBut if another thread accessed or dirtied the pte between the first 2\\ncalls, this could lead to loss of that information.  Since\\nptep_modify_prot_start() gets and clears atomically, the following is the\\ncorrect pattern and prevents any possible race.  Any access after the\\nfirst call would see an invalid pte and cause a fault:\\n\\n  pte = ptep_modify_prot_start(ptep);\\n  pte = pte_mkuffd_wp(pte);\\n  ptep_modify_prot_commit(ptep, pte);\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/proc/task_mmu: corrige la p\u00e9rdida de bits j\u00f3venes/sucios durante el escaneo del mapa de p\u00e1ginas que make_uffd_wp_pte() estaba haciendo anteriormente: pte = ptep_get(ptep); ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte); Pero si otro hilo accedi\u00f3 o ensuci\u00f3 el pte entre las 2 primeras llamadas, esto podr\u00eda provocar la p\u00e9rdida de esa informaci\u00f3n. Dado que ptep_modify_prot_start() obtiene y borra at\u00f3micamente, el siguiente es el patr\u00f3n correcto y evita cualquier posible ejecuci\u00f3n. Cualquier acceso despu\u00e9s de la primera llamada ver\u00eda un pte no v\u00e1lido y provocar\u00eda una falla: pte = ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte);\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.