{"id":"CVE-2024-56556","summary":"binder: fix node UAF in binder_add_freeze_work()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix node UAF in binder_add_freeze_work()\n\nIn binder_add_freeze_work() we iterate over the proc-\u003enodes with the\nproc-\u003einner_lock held. However, this lock is temporarily dropped in\norder to acquire the node-\u003elock first (lock nesting order). This can\nrace with binder_node_release() and trigger a use-after-free:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x19c\n  Write of size 4 at addr ffff53c04c29dd04 by task freeze/640\n\n  CPU: 5 UID: 0 PID: 640 Comm: freeze Not tainted 6.11.0-07343-ga727812a8d45 #17\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   _raw_spin_lock+0xe4/0x19c\n   binder_add_freeze_work+0x148/0x478\n   binder_ioctl+0x1e70/0x25ac\n   __arm64_sys_ioctl+0x124/0x190\n\n  Allocated by task 637:\n   __kmalloc_cache_noprof+0x12c/0x27c\n   binder_new_node+0x50/0x700\n   binder_transaction+0x35ac/0x6f74\n   binder_thread_write+0xfb8/0x42a0\n   binder_ioctl+0x18f0/0x25ac\n   __arm64_sys_ioctl+0x124/0x190\n\n  Freed by task 637:\n   kfree+0xf0/0x330\n   binder_thread_read+0x1e88/0x3a68\n   binder_ioctl+0x16d8/0x25ac\n   __arm64_sys_ioctl+0x124/0x190\n  ==================================================================\n\nFix the race by taking a temporary reference on the node before\nreleasing the proc-\u003einner lock. This ensures the node remains alive\nwhile in use.","aliases":["A-380855429","ASB-A-380855429"],"modified":"2026-04-02T12:24:47.354229Z","published":"2024-12-27T14:23:02.556Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56556.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/38fbefeb2c140b581ed7de8117a5c90d6dd89c22"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc8aea47b928cc153b591b3558829ce42f685074"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56556.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56556"},{"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":"d579b04a52a183db47dfcb7a44304d7747d551e1"},{"fixed":"38fbefeb2c140b581ed7de8117a5c90d6dd89c22"},{"fixed":"dc8aea47b928cc153b591b3558829ce42f685074"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56556.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}