{"id":"CVE-2024-56555","summary":"binder: fix OOB in binder_add_freeze_work()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix OOB 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 to\nacquire the node-\u003elock first (lock nesting order). This can race with\nbinder_deferred_release() which removes the nodes from the proc-\u003enodes\nrbtree and adds them into binder_dead_nodes list. This leads to a broken\niteration in binder_add_freeze_work() as rb_next() will use data from\nbinder_dead_nodes, triggering an out-of-bounds access:\n\n  ==================================================================\n  BUG: KASAN: global-out-of-bounds in rb_next+0xfc/0x124\n  Read of size 8 at addr ffffcb84285f7170 by task freeze/660\n\n  CPU: 8 UID: 0 PID: 660 Comm: freeze Not tainted 6.11.0-07343-ga727812a8d45 #18\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   rb_next+0xfc/0x124\n   binder_add_freeze_work+0x344/0x534\n   binder_ioctl+0x1e70/0x25ac\n   __arm64_sys_ioctl+0x124/0x190\n\n  The buggy address belongs to the variable:\n   binder_dead_nodes+0x10/0x40\n  [...]\n  ==================================================================\n\nThis is possible because proc-\u003enodes (rbtree) and binder_dead_nodes\n(list) share entries in binder_node through a union:\n\n\tstruct binder_node {\n\t[...]\n\t\tunion {\n\t\t\tstruct rb_node rb_node;\n\t\t\tstruct hlist_node dead_node;\n\t\t};\n\nFix the race by checking that the proc is still alive. If not, simply\nbreak out of the iteration.","modified":"2026-08-12T03:51:37.516320148Z","published":"2024-12-27T14:23:01.650Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56555.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/011e69a1b23011c0db3af4b8293fdd4522cc97b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6b1be1da1f8279cf091266e71b5153c5b02aaff6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56555.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56555"},{"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":"6b1be1da1f8279cf091266e71b5153c5b02aaff6"},{"fixed":"011e69a1b23011c0db3af4b8293fdd4522cc97b0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56555.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56555.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}