CVE-2026-74580— vhost 重置 vring 元数据缓存
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，已修复以下漏洞： vhost：在 vring 重新配置时重置 vring 元数据缓存 缓存用于支持每个 vring 元数据区域的 。 在缓存命中时提前返回，并将此命中视为该区域已通过验证的证明： 该缓存在以下情况下会被重置： 和 发生时、设备 IOTLB（重新）初始化时、以及 vq 重置时。但在以下情况下不会重置： 替换 、 和 时，或 更改区域大小时。 当附加了设备 IOTLB 时，这两个 ioctl 调用在 vq 处于活跃状态时均可被接受，且在 ioctl 调用时不会验证地址： 和 由于
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f889491380582b4ba2981cf0b0d7d6a40fb30ab7< 5224bd37e37d36076a550d99b2aebba33939fd95 |
affected |
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< 54617e9119be2eb728ecdd8d977b99c99d4c498a |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< 13fa6f32a56a386a82bd7451644c494beed034af |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7 |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< 6fa3e9b1fe856259555a7e22f3f3082e7827fd9b |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6 |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< b70ebe0bba254e093dd5fd4c0c170941ce83eb85 |
affected | ||
f889491380582b4ba2981cf0b0d7d6a40fb30ab7< de845981da67a6b049080c87e605130b0c30adc5 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74580 基础信息
漏洞信息
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Vulnerability Title
vhost: reset the vring metadata cache on vring reconfiguration
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
vhost: reset the vring metadata cache on vring reconfiguration
vq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring
metadata region, and iotlb_access_ok() returns early on a cache hit,
taking the hit as proof that the region has already been validated:
if (vhost_vq_meta_fetch(vq, addr, len, type))
return true;
The cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on
device IOTLB (re)initialisation and on vq reset, but not when
VHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when
VHOST_SET_VRING_NUM changes the region sizes.
With a device IOTLB attached both ioctls are accepted while the vq is
live, and neither validates the addresses at ioctl time: vq_access_ok()
and vq_log_used_access_ok() return true early because the addresses are
GIOVAs, deferring validation to prefetch time. Once the cache has been
populated that deferred validation no longer runs -- vq_meta_prefetch()
hits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps
translating through the old mapping as
map->addr + addr - map->start
for an address the mapping no longer covers. vhost_copy_to_user() and
vhost_copy_from_user() consume the result with __copy_to_user() and
__copy_from_user(), which do not check it either, so a subsequent used
ring update or descriptor fetch accesses memory outside the region the
IOTLB actually maps.
Reset the metadata cache whenever the vring is reconfigured, so the new
addresses are pushed back through iotlb_access_ok()'s slow path.
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-2026-74580 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74580 补丁与修复 (8)
同批安全公告 · Linux · 2026-08-21 · 共 4 条
| CVE-2026-74583 | Linux内核cls_route模块过滤器快速映射use-after-free漏洞 | |
| CVE-2026-74581 | Linux IPv6 清除被抑制的FIB6规则结果 | |
| CVE-2026-74582 | Linux网络栈 非环形发送路径中 hard_header_len 不一致漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-74580
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