FKIE_CVE-2024-42318

Vulnerability from fkie_nvd - Published: 2024-08-17 09:15 - Updated: 2026-06-17 07:49
Severity
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: landlock: Don't lose track of restrictions on cred_transfer When a process' cred struct is replaced, this _almost_ always invokes the cred_prepare LSM hook; but in one special case (when KEYCTL_SESSION_TO_PARENT updates the parent's credentials), the cred_transfer LSM hook is used instead. Landlock only implements the cred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes all information on Landlock restrictions to be lost. This basically means that a process with the ability to use the fork() and keyctl() syscalls can get rid of all Landlock restrictions on itself. Fix it by adding a cred_transfer hook that does the same thing as the existing cred_prepare hook. (Implemented by having hook_cred_prepare() call hook_cred_transfer() so that the two functions are less likely to accidentally diverge in the future.)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://bugs.chromium.org/p/project-zero/issues/detail?id=2566Issue Tracking, Third Party Advisory
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ffPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://www.openwall.com/lists/oss-security/2024/08/17/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/08/17/2Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/landlock/cred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "916c648323fa53b89eedb34a0988ddaf01406117",
              "status": "affected",
              "version": "385975dca53eb41031d0cbd1de318eb1bc5d6bb9",
              "versionType": "git"
            },
            {
              "lessThan": "0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c",
              "status": "affected",
              "version": "385975dca53eb41031d0cbd1de318eb1bc5d6bb9",
              "versionType": "git"
            },
            {
              "lessThan": "16896914bace82d7811c62f3b6d5320132384f49",
              "status": "affected",
              "version": "385975dca53eb41031d0cbd1de318eb1bc5d6bb9",
              "versionType": "git"
            },
            {
              "lessThan": "b14cc2cf313bd29056fadbc8ecd7f957cf5791ff",
              "status": "affected",
              "version": "385975dca53eb41031d0cbd1de318eb1bc5d6bb9",
              "versionType": "git"
            },
            {
              "lessThan": "39705a6c29f8a2b93cf5b99528a55366c50014d1",
              "status": "affected",
              "version": "385975dca53eb41031d0cbd1de318eb1bc5d6bb9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "security/landlock/cred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C9AF5ED3-AC3F-4864-B907-F7C809A8995E",
              "versionEndExcluding": "5.15.165",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E45EAC72-8329-4F99-8276-86AF9BB3496A",
              "versionEndExcluding": "6.1.103",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CC912330-6B41-4C6B-99AF-F3857FBACB6A",
              "versionEndExcluding": "6.6.44",
              "versionStartIncluding": "6.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "92D388F2-1EAF-4CFA-AC06-5B26D762EA7D",
              "versionEndExcluding": "6.10.3",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Don\u0027t lose track of restrictions on cred_transfer\n\nWhen a process\u0027 cred struct is replaced, this _almost_ always invokes\nthe cred_prepare LSM hook; but in one special case (when\nKEYCTL_SESSION_TO_PARENT updates the parent\u0027s credentials), the\ncred_transfer LSM hook is used instead.  Landlock only implements the\ncred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes\nall information on Landlock restrictions to be lost.\n\nThis basically means that a process with the ability to use the fork()\nand keyctl() syscalls can get rid of all Landlock restrictions on\nitself.\n\nFix it by adding a cred_transfer hook that does the same thing as the\nexisting cred_prepare hook. (Implemented by having hook_cred_prepare()\ncall hook_cred_transfer() so that the two functions are less likely to\naccidentally diverge in the future.)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: landlock: no pierda de vista las restricciones en cred_transfer Cuando se reemplaza la estructura cred de un proceso, esto _almost_ always invoca el gancho LSM cred_prepare; pero en un caso especial (cuando KEYCTL_SESSION_TO_PARENT actualiza las credenciales de los padres), se utiliza el gancho LSM cred_transfer. Landlock solo implementa el gancho cred_prepare, no cred_transfer, por lo que KEYCTL_SESSION_TO_PARENT hace que se pierda toda la informaci\u00f3n sobre las restricciones de Landlock. B\u00e1sicamente, esto significa que un proceso con la capacidad de utilizar las llamadas al sistema fork() y keyctl() puede deshacerse de todas las restricciones de Landlock sobre s\u00ed mismo. Solucionelo agregando un gancho cred_transfer que haga lo mismo que el gancho cred_prepare existente. (Se implementa haciendo que hook_cred_prepare() llame a hook_cred_transfer() para que sea menos probable que las dos funciones diverjan accidentalmente en el futuro)."
    }
  ],
  "id": "CVE-2024-42318",
  "lastModified": "2026-06-17T07:49:15.030",
  "metrics": {
    "cvssMetricV31": [
      {
        "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-42318",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T16:09:35.795087Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-08-17T09:15:11.700",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=2566"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c"
    },
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ff"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List"
      ],
      "url": "https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2024/08/17/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2024/08/17/2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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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