{"id":"CVE-2024-42318","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-42318","generatedAt":"2026-10-28T07:25:32.121Z","title":"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…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Don't lose track of restrictions on cred_transfer\n\nWhen a process' 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's 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.)","published":"2024-08-17T09:15:12.000Z","lastModified":"2026-08-04T11:19:52.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":["linux/linux kernel"],"epss":{"score":0.00299,"percentile":0.22474,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://bugs.chromium.org/p/project-zero/issues/detail?id=2566","tags":["Issue Tracking","Third Party Advisory"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ff","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/","tags":["Mailing List"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://www.openwall.com/lists/oss-security/2024/08/17/2","tags":["Mailing List"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"http://www.openwall.com/lists/oss-security/2024/08/17/2","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-42318","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}