CVE-2024-56554 in Linux
摘要
由 VulDB • 2026-06-11
在 Linux 内核中，已修复以下漏洞：
binder: 修复 binder_release_work() 中的冻结状态 Use-After-Free (UAF) 问题
当清理 binder 引用时，应同时移除关联进程中排队的任何冻结工作。否则，该引用会被释放，但其 ref->freeze.work 仍保留在 proc->work 队列中，从而导致 use-after-free（释放后使用）漏洞，如下面的 KASAN 报告所示：
``` ================================================================== BUG: KASAN: slab-use-after-free in binder_release_work+0x398/0x3d0 Read of size 8 at addr ffff31600ee91488 by task kworker/5:1/211
CPU: 5 UID: 0 PID: 211 Comm: kworker/5:1 Not tainted 6.11.0-rc7-00382-gfc6c92196396 #22 Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: binder_release_work+0x398/0x3d0 binder_deferred_func+0xb60/0x109c process_one_work+0x51c/0xbd4 worker_thread+0x608/0xee8
Allocated by task 703: __kmalloc_cache_noprof+0x130/0x280 binder_thread_write+0xdb4/0x42a0 binder_ioctl+0x18f0/0x25ac __arm64_sys_ioctl+0x124/0x190 invoke_syscall+0x6c/0x254
Freed by task 211: kfree+0xc4/0x230 binder_deferred_func+0xae8/0x109c process_one_work+0x51c/0xbd4 worker_thread+0x608/0xee8 ================================================================== ```
此提交通过确保在清理 binder 引用时移除任何已排队的冻结工作，修复了该问题。
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