CVE-2026-89930— KVM嵌套虚拟化本地TLB刷新漏洞
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。
以下是该 Linux 内核漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： KVM：nVMX：在嵌套 VM-Enter 失败时执行本地 TLB 刷新 KVM 会在“完整”的嵌套 VM-Exit 时处理本地 TLB 刷新（通过 ），但不会在嵌套 VM-Enter 失败时执行该操作（例如由于 中 VMCS 检查失败导致的失败）。 然而，即使嵌套 VM-Enter 未成功，KVM 可能已经排队了需要执行的 TLB 刷新请求。例如： 当 L2 的 VPID 被禁用时（通过 ）； 或者通过 MSR 加载列表。正
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< c0c66cd575e31218da6a7d104c6ef80b0830b60c |
affected |
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< 1025b938dc439b75c720a568a855a13eeb245686 |
affected | ||
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< 312cdb6d8940827dea63a7a52fb714a5049f06d1 |
affected | ||
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< f74fccdf4f7fb0780cd84944108d35f3d9dc46a7 |
affected | ||
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< c43563e7518e65ec6ccaa6a65f84c5af5ca5d379 |
affected | ||
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< 62c3ee4c9f0e2efef5157358b3549e50ede96d73 |
affected | ||
5c614b3583e7b6dab0c86356fa36c2bcbb8322a0< 05a0b701d1089fb57beeb8982f23c3bbafe0fa8b |
affected | ||
4.4 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-89930 基础信息
漏洞信息
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Vulnerability Title
KVM: nVMX: Service local TLB flushes on failed nested VM-Enter
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: nVMX: Service local TLB flushes on failed nested VM-Enter
KVM services local TLB flushes on "full" nested VM-Exits (through
__nested_vmx_vmexit()), but not if a nested VM-Enter fails (e.g. due to
failed VMCS checks in nested_vmx_enter_non_root_mode()).
However, it is possible that KVM had queued TLB flushes that need to be
performed, even if the nested VM-Enter was not successful. For example,
if VPID is disabled for L2 (via nested_vmx_transition_tlb_flush(), or if
via the MSR load lists, as the SDM says:
If any MSR is being loaded in such a way that would architecturally
require a TLB flush, the TLBs are updated so that, after VM entry, the
logical processor will not use any translations that were cached before
the transition.
The SDM is unclear about when the TLB flush should occur, and whether or
not a failed VM entry would flush the TLB, so it is safer to always
do the TLB flush in this case.
More concretely, KVM also updates the last VPID L1 used for L2 in
nested_vmx_transition_tlb_flush() (i.e. last_vpid), even if the VM entry
ultimately fails. With the current code, KVM could miss a TLB flush if
L1 changes L2's VPID, then does a failed VM entry followed by a
successful one, as the failed VM entry would update last_vpid but not
actually flush the TLB. Servicing local TLB flushes on failed VM entries
makes sure that the TLB is always flushed when last_vpid is updated.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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
受影响产品
二、漏洞 CVE-2026-89930 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-89930 其他参考 (7)
同批安全公告 · Linux · 2026-09-16 · 共 276 条
| CVE-2026-90048 | 9.8 CRITICAL | Linux内核NTFS3文件系统越界写漏洞 |
| CVE-2026-90012 | 9.8 CRITICAL | SPI DMA映射所有权修复 |
| CVE-2026-89970 | 9.8 CRITICAL | NVM Target SQ拆除时超时工作未同步 |
| CVE-2026-89857 | 9.8 CRITICAL | QLogic qla2xxx NVMe LS拒绝竞态条件漏洞 |
| CVE-2026-89969 | 9.8 CRITICAL | Linux内核 nvmet-tcp 越界写入漏洞 |
| CVE-2026-89847 | 9.8 CRITICAL | qla2xxx SCSI驱动异步IOCB超时双重完成漏洞 |
| CVE-2026-89972 | 9.8 CRITICAL | NVMe驱动错误路径SRCU宽限期缺失漏洞 |
| CVE-2026-89990 | 9.8 CRITICAL | Ceph ceph_mds_check_access 互斥锁缺失漏洞 |
| CVE-2026-90036 | 9.8 CRITICAL | Linux NFSd 阻塞锁收割时释放后使用漏洞 |
| CVE-2026-90038 | 9.8 CRITICAL | Linux内核NFSD导出撤销后使用漏洞 |
| CVE-2026-90037 | 9.8 CRITICAL | Linux内核NFSD close_lru释放后使用漏洞 |
| CVE-2026-89788 | 9.8 CRITICAL | Linux kernel ksmbd 释放后使用漏洞 |
| CVE-2026-89783 | 9.8 CRITICAL | Linux内核 xfrm6 越界写入漏洞 |
| CVE-2026-90042 | 9.8 CRITICAL | Ceph 虚拟内存分配缓冲区文件名解密漏洞 |
| CVE-2026-89778 | 9.8 CRITICAL | isofs 空 zisofs 块页面数组越界访问漏洞 |
| CVE-2026-90049 | 9.3 CRITICAL | 内核网络子系统中skb_zerocopy处理中的缺陷 |
| CVE-2026-89775 | 9.3 CRITICAL | KVM arm64 VNCR TLB大小计算漏洞 |
| CVE-2026-89915 | 9.3 CRITICAL | KVM arm64 移除虚拟机级 VNCR 映射计数器 |
| CVE-2026-89916 | 9.3 CRITICAL | KVM arm64 VNCR失效重试漏洞 |
| CVE-2026-89918 | 9.3 CRITICAL | KVM arm64 TLBI失效处理漏洞 |
显示前 20 条，共 276 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89930
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