{"id":"CVE-2025-40201","revision":"4271990ab3bc465a8172af458af30296","records":[{"revision":"4271990ab3bc465a8172af458af30296","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-40201","aliases":[],"title":"kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths\n\nThe usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit()\npath is very broken.\n\nsys_prlimit64() does get_task_struct(tsk) but this only protects task_struct\nitself. If tsk != current and tsk is not a leader, this process can exit/exec\nand task_lock(tsk->group_leader) may use the already freed task_struct.\n\nAnother problem is that sys_prlimit64() can race with mt-exec which changes\n->group_leader. In this case do_prlimit() may take the wrong lock, or (worse)\n->group_leader may change between task_lock() and task_unlock().\n\nChange sys_prlimit64() to take tasklist_lock when necessary. This is not\nnice, but I don't see a better fix for -stable.","state":0,"publishedAt":"2025-11-12T21:56:34.063+00:00","modifiedAt":"2026-10-15T22:02:40.564+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/sys.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"18c91bb2d87268d23868bf13508f5bc9cf04e89a\",\n                            \"lessThan\": \"1bc0d9315ef5296abb2c9fd840336255850ded18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18c91bb2d87268d23868bf13508f5bc9cf04e89a\",\n                            \"lessThan\": \"132f827e7bac7373e1522e89709d70b43cae5342\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18c91bb2d87268d23868bf13508f5bc9cf04e89a\",\n                            \"lessThan\": \"19b45c84bd9fd42fa97ff80c6350d604cb871c75\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18c91bb2d87268d23868bf13508f5bc9cf04e89a\",\n                            \"lessThan\": \"6796412decd2d8de8ec708213bbc958fab72f143\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18c91bb2d87268d23868bf13508f5bc9cf04e89a\",\n                            \"lessThan\": \"a15f37a40145c986cdf289a4b88390f35efdecc4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/sys.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.157\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.113\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.54\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17.4\",\n                            \"lessThanOrEqual\": \"6.17.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/1bc0d9315ef5296abb2c9fd840336255850ded18","https://git.kernel.org/stable/c/132f827e7bac7373e1522e89709d70b43cae5342","https://git.kernel.org/stable/c/19b45c84bd9fd42fa97ff80c6350d604cb871c75","https://git.kernel.org/stable/c/6796412decd2d8de8ec708213bbc958fab72f143","https://git.kernel.org/stable/c/a15f37a40145c986cdf289a4b88390f35efdecc4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40201","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-40201","identifiers":["CVE-2025-40201"]},"retained":false,"historicalAffected":[]}],"coverage":[]}