CVE-2026-99164— imx SPI 驱动因 DMA 缓冲区过小导致内存损坏漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在 Linux 内核中，以下漏洞已被修复： spi: imx：修复因 DMA 回退缓冲区尺寸不足导致的 slab 内存损坏问题 自提交 faa8e404ad8e（"spi: imx: 为 ECSPI DMA 模式支持动态突发长度”）以来，该驱动程序使用 kzalloc(dma_len) 分配其私有的 DMA 发送/接收缓冲区，其中 dma_len 仅向上对齐到 4 字节；然而，在映射、同步和取消映射这些缓冲区时，却使用了 DMA_CACHE_ALIGNED_LEN(dma_len)，即向上对齐到缓存行大小。这导致
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一、 漏洞 CVE-2026-99164 基础信息
漏洞信息
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Vulnerability Title
spi: imx: fix slab corruption from undersized DMA bounce buffers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
spi: imx: fix slab corruption from undersized DMA bounce buffers
Since commit faa8e404ad8e ("spi: imx: support dynamic burst length for
ECSPI DMA mode"), the driver allocates its private DMA TX/RX buffers
with kzalloc(dma_len), where dma_len is only rounded up to 4 bytes, but
maps, syncs and unmaps them with DMA_CACHE_ALIGNED_LEN(dma_len), i.e.
rounded up to the cache line size. As a result, the DMA API operates on
memory beyond the end of the allocation.
This was observed on a custom i.MX8MP platform with an mcp251xfd CAN
controller under heavy RPMSG load, as a series of refcount_t warnings
triggered from rpmsg_recv_done() in virtio_rpmsg_bus:
refcount_t: addition on 0; use-after-free.
refcount_t: underflow; use-after-free.
refcount_t: saturated; leaking memory.
Leading finally to an "Unable to handle kernel paging request" oops.
Reproducing this problem took between 30 minutes and roughly 30 hours
under the same workload.
Hardware watchpoints on the refcount of a struct rpmsg_endpoint showed
it was overwritten from 2 to 1 by __pi_memcpy_generic() in the
irq/155-spi2.0 thread. Additionally it was found that a "normal"
rpmsg_recv_done() took 11µs +/-2µs from its kref_get to kref_put. In
the error case the same sequence took about 215µs +/-10µs. Based on
this, an LLM was used to identify the size mismatch fixed here.
Allocate the buffers with DMA_CACHE_ALIGNED_LEN(dma_len) so they cover
the full mapped length, and use the same length for
dma_sync_single_for_cpu() to stay consistent with map and unmap.
With this patch applied, the same workload ran for more than 200 hours
without the problem reproducing.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-99164 的公开POC
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CVE-2026-99164 补丁与修复 (2)
同批安全公告 · Linux · 2026-10-28 · 共 117 条
| CVE-2026-99143 | Linux 内核 tracing 组件越界访问漏洞 | |
| CVE-2026-99129 | SELinux BPF 令牌权限检查漏洞 | |
| CVE-2026-99130 | Linux io_uring 拒绝服务漏洞 | |
| CVE-2026-99131 | XFS 文件系统权限检查绕过漏洞 | |
| CVE-2026-99133 | Linux 内核网络 IUCV 远程拒绝服务漏洞 | |
| CVE-2026-99132 | XFS xfs_sync_sb_buf 缓冲区锁竞争漏洞 | |
| CVE-2026-99134 | mac802154 数据竞争与空指针解引用漏洞 | |
| CVE-2026-99135 | dm-integrity 大标签丢弃无限循环漏洞 | |
| CVE-2026-99137 | CIFS 文件系统在无缓存句柄时更新 i_size 存在漏洞 | |
| CVE-2026-99136 | dm-crypt 竞态条件漏洞 | |
| CVE-2026-99138 | Linux TCP 协议栈 use-after-free 漏洞 | |
| CVE-2026-99140 | tracing 模块缓冲区事件时间戳修复 | |
| CVE-2026-99139 | TCP 协议栈 TCP_CONGESTION 选项后释放漏洞 | |
| CVE-2026-99141 | 内核 tracing 模块 print_graph_function_event 崩溃漏洞 | |
| CVE-2026-99142 | Tracing 组件栈容量检查缺失漏洞 | |
| CVE-2026-99154 | libiscsi 负任务索引拒绝漏洞 | |
| CVE-2026-99151 | AMD Display 驱动 NULL 指针解引用漏洞 | |
| CVE-2026-99153 | libiscsi 拒绝 PDU 验证逻辑漏洞 | |
| CVE-2026-99152 | libiscsi 管理响应任务验证绕过漏洞 | |
| CVE-2026-99150 | amdgpu 驱动程序资源管理漏洞 |
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