FKIE_CVE-2024-50263

Vulnerability from fkie_nvd - Published: 2024-11-11 14:15 - Updated: 2026-08-04 11:21
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fork: only invoke khugepaged, ksm hooks if no error There is no reason to invoke these hooks early against an mm that is in an incomplete state. The change in commit d24062914837 ("fork: use __mt_dup() to duplicate maple tree in dup_mmap()") makes this more pertinent as we may be in a state where entries in the maple tree are not yet consistent. Their placement early in dup_mmap() only appears to have been meaningful for early error checking, and since functionally it'd require a very small allocation to fail (in practice 'too small to fail') that'd only occur in the most dire circumstances, meaning the fork would fail or be OOM'd in any case. Since both khugepaged and KSM tracking are there to provide optimisations to memory performance rather than critical functionality, it doesn't really matter all that much if, under such dire memory pressure, we fail to register an mm with these. As a result, we follow the example of commit d2081b2bf819 ("mm: khugepaged: make khugepaged_enter() void function") and make ksm_fork() a void function also. We only expose the mm to these functions once we are done with them and only if no error occurred in the fork operation.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b85aa0da8cd01173b9afd1f70080fbb9576c4b0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/985da552a98e27096444508ce5d853244019111fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://project-zero.issues.chromium.org/issues/373391951
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/ksm.h",
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b85aa0da8cd01173b9afd1f70080fbb9576c4b0",
              "status": "affected",
              "version": "d2406291483775ecddaee929231a39c70c08fda2",
              "versionType": "git"
            },
            {
              "lessThan": "985da552a98e27096444508ce5d853244019111f",
              "status": "affected",
              "version": "d2406291483775ecddaee929231a39c70c08fda2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/ksm.h",
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "40C0D9F3-9632-46FE-AA28-8CD73B52DEE7",
              "versionEndExcluding": "6.11.7",
              "versionStartIncluding": "6.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "E0F717D8-3014-4F84-8086-0124B2111379",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*",
              "matchCriteriaId": "24DBE6C7-2AAE-4818-AED2-E131F153D2FA",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfork: only invoke khugepaged, ksm hooks if no error\n\nThere is no reason to invoke these hooks early against an mm that is in an\nincomplete state.\n\nThe change in commit d24062914837 (\"fork: use __mt_dup() to duplicate\nmaple tree in dup_mmap()\") makes this more pertinent as we may be in a\nstate where entries in the maple tree are not yet consistent.\n\nTheir placement early in dup_mmap() only appears to have been meaningful\nfor early error checking, and since functionally it\u0027d require a very small\nallocation to fail (in practice \u0027too small to fail\u0027) that\u0027d only occur in\nthe most dire circumstances, meaning the fork would fail or be OOM\u0027d in\nany case.\n\nSince both khugepaged and KSM tracking are there to provide optimisations\nto memory performance rather than critical functionality, it doesn\u0027t\nreally matter all that much if, under such dire memory pressure, we fail\nto register an mm with these.\n\nAs a result, we follow the example of commit d2081b2bf819 (\"mm:\nkhugepaged: make khugepaged_enter() void function\") and make ksm_fork() a\nvoid function also.\n\nWe only expose the mm to these functions once we are done with them and\nonly if no error occurred in the fork operation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fork: solo invocar ganchos khugepaged, ksm si no hay error No hay raz\u00f3n para invocar estos ganchos de manera temprana contra un mm que est\u00e1 en un estado incompleto. El cambio en el commit d24062914837 (\"fork: usar __mt_dup() para duplicar el \u00e1rbol de maple en dup_mmap()\") hace que esto sea m\u00e1s pertinente ya que podemos estar en un estado donde las entradas en el \u00e1rbol de maple a\u00fan no son consistentes. Su ubicaci\u00f3n temprana en dup_mmap() solo parece haber sido significativa para la comprobaci\u00f3n temprana de errores, y dado que funcionalmente requerir\u00eda una asignaci\u00f3n muy peque\u00f1a para fallar (en la pr\u00e1ctica \u0027demasiado peque\u00f1a para fallar\u0027) eso solo ocurrir\u00eda en las circunstancias m\u00e1s extremas, lo que significa que la bifurcaci\u00f3n fallar\u00eda o quedar\u00eda OOM en cualquier caso. Dado que tanto el seguimiento de khugepaged como el de KSM est\u00e1n ah\u00ed para proporcionar optimizaciones al rendimiento de la memoria en lugar de una funcionalidad cr\u00edtica, en realidad no importa tanto si, bajo una presi\u00f3n de memoria tan extrema, no logramos registrar un mm con estos. Como resultado, seguimos el ejemplo de el commit d2081b2bf819 (\"mm: khugepaged: make khugepaged_enter() void function\") y tambi\u00e9n hacemos que ksm_fork() sea una funci\u00f3n void. Solo exponemos el mm a estas funciones una vez que terminamos con ellas y solo si no ocurri\u00f3 ning\u00fan error en la operaci\u00f3n de bifurcaci\u00f3n."
    }
  ],
  "id": "CVE-2024-50263",
  "lastModified": "2026-08-04T11:21:38.527",
  "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-11-11T14:15:15.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3b85aa0da8cd01173b9afd1f70080fbb9576c4b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/985da552a98e27096444508ce5d853244019111f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://project-zero.issues.chromium.org/issues/373391951"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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