CVE-2024-42318 (GCVE-0-2024-42318)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2026-08-05 11:36
VLAI
Title
landlock: Don't lose track of restrictions on cred_transfer
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.)
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 916c648323fa53b89eedb34a0988ddaf01406117 (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 16896914bace82d7811c62f3b6d5320132384f49 (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < b14cc2cf313bd29056fadbc8ecd7f957cf5791ff (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 39705a6c29f8a2b93cf5b99528a55366c50014d1 (git)
Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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. 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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: landlock: Don\u0026#39;t lose track of restrictions on cred_transfer",
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2024/08/17/2\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:04:37.227Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-42318\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:09:35.795087Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:23.367Z\"}}], \"cna\": {\"title\": \"landlock: Don\u0027t lose track of restrictions on cred_transfer\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"385975dca53eb41031d0cbd1de318eb1bc5d6bb9\", \"lessThan\": \"916c648323fa53b89eedb34a0988ddaf01406117\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"385975dca53eb41031d0cbd1de318eb1bc5d6bb9\", \"lessThan\": \"0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"385975dca53eb41031d0cbd1de318eb1bc5d6bb9\", \"lessThan\": \"16896914bace82d7811c62f3b6d5320132384f49\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"385975dca53eb41031d0cbd1de318eb1bc5d6bb9\", \"lessThan\": \"b14cc2cf313bd29056fadbc8ecd7f957cf5791ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"385975dca53eb41031d0cbd1de318eb1bc5d6bb9\", \"lessThan\": \"39705a6c29f8a2b93cf5b99528a55366c50014d1\", \"versionType\": \"git\"}], \"programFiles\": [\"security/landlock/cred.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.44\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"security/landlock/cred.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117\"}, {\"url\": \"https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c\"}, {\"url\": \"https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49\"}, {\"url\": \"https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ff\"}, {\"url\": \"https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1\"}, {\"url\": \"https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/\"}, {\"url\": \"https://www.openwall.com/lists/oss-security/2024/08/17/2\"}, {\"url\": \"https://bugs.chromium.org/p/project-zero/issues/detail?id=2566\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.165\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.103\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.44\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.3\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"5.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:26:39.182Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42318\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:04:37.227Z\", \"dateReserved\": \"2024-07-30T07:40:12.278Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-17T09:09:31.160Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.