CVE-2026-74580— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.11版本存在安全漏洞，该漏洞源于vring重新配置时未重置元数据缓存，可能导致访问IOTLB映射区域之外的内存。
已观察到在野利用
github_trending · low
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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.11版本存在安全漏洞，该漏洞源于vring重新配置时未重置元数据缓存，可能导致访问IOTLB映射区域之外的内存。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
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-2026-74581 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74582 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-74583 | 7.8 HIGH | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-74580
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