漏洞信息
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Vulnerability Title
TOCTOU race in mbox_send syscall verifier allows userspace to leak kernel memory
Vulnerability Description
The userspace syscall verifier z_vrfy_mbox_send() in drivers/mbox/mbox_handlers.c validated the nested msg->data/msg->size fields by reading them directly out of live userspace memory, and then forwarded the original, still-mutable userspace struct mbox_msg * pointer to z_impl_mbox_send() and the underlying driver. Between the access check and the driver's use of msg->data, the validated pointer could be replaced, leaving a time-of-check/time-of-use window.
On a system built with CONFIG_USERSPACE, any unprivileged userspace thread may invoke the mbox_send() system call. A second thread sharing the caller's address space can race to overwrite msg->data with a supervisor (kernel) address after the verifier's bounds check has passed but before the driver dereferences it. The driver then reads from the attacker-chosen address in supervisor context (for example memcpy(&data32, msg->data, msg->size) in the NXP mailbox driver, whose bytes are subsequently emitted to the peer mailbox endpoint).
The impact is a userspace-to-supervisor access-control bypass: disclosure of kernel memory contents (high confidentiality impact), or, for an invalid/unmapped target address, a faulting kernel read causing denial of service. The fix snapshots the entire struct mbox_msg into a kernel-stack copy with k_usermode_from_copy() and validates and forwards that immutable copy, closing the race.
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Vulnerability Title
zephyrproject Zephyr 竞争条件问题漏洞
Vulnerability Description
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 3.0.0版本至4.4.2之前版本存在竞争条件问题漏洞,该漏洞源于drivers/mbox/mbox_handlers.c中的系统调用验证器z_vrfy_mbox_send()在验证嵌套的msg->data/msg->size字段时直接读取用户空间内存,并将原始可变指针转发给驱动,导致检查与使用之间存在竞争窗口,攻击者可利用多线程竞争将msg->dat
CVSS Information
N/A
Vulnerability Type
N/A