{"id":"CVE-2025-68319","revision":"44c91c72f1c8477094c5b99efd471386","records":[{"revision":"44c91c72f1c8477094c5b99efd471386","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-68319","aliases":[],"title":"netconsole: Acquire su_mutex before navigating configs hierarchy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetconsole: Acquire su_mutex before navigating configs hierarchy\n\nThere is a race between operations that iterate over the userdata\ncg_children list and concurrent add/remove of userdata items through\nconfigfs. The update_userdata() function iterates over the\nnt->userdata_group.cg_children list, and count_extradata_entries() also\niterates over this same list to count nodes.\n\nQuoting from Documentation/filesystems/configfs.rst:\n> A subsystem can navigate the cg_children list and the ci_parent pointer\n> to see the tree created by the subsystem.  This can race with configfs'\n> management of the hierarchy, so configfs uses the subsystem mutex to\n> protect modifications.  Whenever a subsystem wants to navigate the\n> hierarchy, it must do so under the protection of the subsystem\n> mutex.\n\nWithout proper locking, if a userdata item is added or removed\nconcurrently while these functions are iterating, the list can be\naccessed in an inconsistent state. For example, the list_for_each() loop\ncan reach a node that is being removed from the list by list_del_init()\nwhich sets the nodes' .next pointer to point to itself, so the loop will\nnever end (or reach the WARN_ON_ONCE in update_userdata() ).\n\nFix this by holding the configfs subsystem mutex (su_mutex) during all\noperations that iterate over cg_children.\nThis includes:\n- userdatum_value_store() which calls update_userdata() to iterate over\n  cg_children\n- All sysdata_*_enabled_store() functions which call\n  count_extradata_entries() to iterate over cg_children\n\nThe su_mutex must be acquired before dynamic_netconsole_mutex to avoid\npotential lock ordering issues, as configfs operations may already hold\nsu_mutex when calling into our code.","state":0,"publishedAt":"2025-12-16T15:39:48.903+00:00","modifiedAt":"2026-10-21T12:38:12.214+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                        \"drivers/net/netconsole.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"df03f830d099f0811281a222aefdd9d400fa0b72\",\n                            \"lessThan\": \"932c0c7a7ec413399febca5fe3dddf913bb5c924\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"df03f830d099f0811281a222aefdd9d400fa0b72\",\n                            \"lessThan\": \"ff70aa7e8cf05745fdba7258952a8bedf33ea336\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"df03f830d099f0811281a222aefdd9d400fa0b72\",\n                            \"lessThan\": \"d7d2fcf7ae31471b4e08b7e448b8fd0ec2e06a1b\",\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                        \"drivers/net/netconsole.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17.8\",\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":[],"references":["https://git.kernel.org/stable/c/932c0c7a7ec413399febca5fe3dddf913bb5c924","https://git.kernel.org/stable/c/ff70aa7e8cf05745fdba7258952a8bedf33ea336","https://git.kernel.org/stable/c/d7d2fcf7ae31471b4e08b7e448b8fd0ec2e06a1b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-68319","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-68319","identifiers":["CVE-2025-68319"]},"retained":false,"historicalAffected":[]}],"coverage":[]}