{"id":"CVE-2024-42318","summary":"landlock: Don't lose track of restrictions on cred_transfer","details":"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.)","modified":"2026-04-16T04:31:54.648842927Z","published":"2024-08-17T09:09:31.160Z","related":["SUSE-SU-2024:3190-1","SUSE-SU-2024:3194-1","SUSE-SU-2024:3195-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3383-1","SUSE-SU-2024:3483-1","SUSE-SU-2025:20044-1","SUSE-SU-2025:20047-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42318.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2024/08/17/2"},{"type":"WEB","url":"https://bugs.chromium.org/p/project-zero/issues/detail?id=2566"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ff"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/"},{"type":"WEB","url":"https://www.openwall.com/lists/oss-security/2024/08/17/2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42318.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-42318"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"385975dca53eb41031d0cbd1de318eb1bc5d6bb9"},{"fixed":"916c648323fa53b89eedb34a0988ddaf01406117"},{"fixed":"0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c"},{"fixed":"16896914bace82d7811c62f3b6d5320132384f49"},{"fixed":"b14cc2cf313bd29056fadbc8ecd7f957cf5791ff"},{"fixed":"39705a6c29f8a2b93cf5b99528a55366c50014d1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42318.json"}}],"schema_version":"1.7.5"}