CVE-2026-74713— vhost_iotlb: add_range中绑定映射分配漏洞
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，以下漏洞已得到修复： vhost_iotlb：在 add_range 中限制映射分配 仅在满足以下条件时才回收旧条目：表具有非零限制、恰好达到该限制，并且设置了 标志。对于未启用回收机制的表，在达到配置的限制后仍会继续分配条目。 现有的 vhost 设备在 vhost.c 中使用 分配其 IOTLB（IO 翻译缓冲区），该值默认为 2048，并可通过模块参数进行调整。现在改为在分配点使用调用者提供的限制值，而不是在公共 IOTLB 辅助函数中添加单独的默认值；同时，对于 vhost 路径中能
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一、 漏洞 CVE-2026-74713 基础信息
漏洞信息
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Vulnerability Title
vhost_iotlb: bound map allocation in add_range
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
vhost_iotlb: bound map allocation in add_range
vhost_iotlb_add_range_ctx() only retires an old entry when the table
has a non-zero limit, has exactly reached that limit and has
VHOST_IOTLB_FLAG_RETIRE set. Non-retiring tables can keep allocating
entries after reaching their configured limit.
Existing vhost devices allocate their IOTLB with max_iotlb_entries from
vhost.c, which defaults to 2048 and is tunable by module parameter. Use
the caller-provided limit at the allocation point instead of adding a
separate default in the common IOTLB helper, and reject non-positive
values in vhost paths that can report an error.
Other vhost IOTLB users should not create zero-limit tables when entries
can be populated from userspace or guest-controlled requests. Add
caller-side max_iotlb_entries parameters for mlx5 vDPA, VDUSE and
vhost-vDPA. Reject non-positive VDUSE and vhost-vDPA values, and require
at least two entries for vdpa_sim and mlx5 vDPA paths that install
full-range mappings, since those mappings are split into two IOTLB
entries.
Handle full-range mappings in the common helper by checking that the
IOTLB can hold both split entries before inserting the first half. This
avoids returning an error after leaving a half mapping behind.
When the table is full, keep the existing retire behavior for retiring
tables and return -ENOSPC for non-retiring tables. Reuse the retired map
node instead of freeing it and allocating a replacement, so a stream of
IOTLB updates cannot keep forcing GFP_ATOMIC allocations after the table
has reached its limit. If a zero-limit IOTLB still reaches the common
helper, treat it as a configuration error and return -EINVAL.
I found this bug myself, though the patch was written with AI assistance.
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-2026-74713 的公开POC
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CVE-2026-74713 补丁与修复 (2)
同批安全公告 · Linux · 2026-08-22 · 共 150 条
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| CVE-2026-74629 | net/dibs: 修复 dmb_clientid_arr 释放漏洞 | |
| CVE-2026-74631 | Linux SMC splice条目生命周期不平衡漏洞 | |
| CVE-2026-74630 | IPv6中in6_dev_get()防止复活inet6_dev漏洞 | |
| CVE-2026-74632 | Linux内核 huge_memory 竞态条件漏洞 | |
| CVE-2026-74633 | tracing: 修复模块事件缓存移除中的空指针解引用漏洞 | |
| CVE-2026-74634 | ring-buffer：禁用调整大小时防止子缓冲区间顺序变化 | |
| CVE-2026-74635 | fbdev bitblit bit_cursor() glyph索引越界漏洞 | |
| CVE-2026-74636 | tracing 工具更新字段与事件定义字段竞态条件漏洞 | |
| CVE-2026-74637 | Linux Perf 核心组件 组领导者 分离后释放后使用漏洞 | |
| CVE-2026-74639 | ALSA us144mkii 重新锚定捕获 URB 漏洞 | |
| CVE-2026-74650 | rtl8723bs WMM参数处理函数越界读取漏洞 |
显示前 20 条，共 150 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74713
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