KVM：x86/mmu：清除脏状态时对 TDP MMU 中的 L2 SPTE 进行写保护 (CVE-2024-26990)

CVE编号

CVE-2024-26990

利用情况

暂无

补丁情况

N/A

披露时间

2024-05-01
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status

Check kvm_mmu_page_ad_need_write_protect() when deciding whether to
write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU
accounts for any role-specific reasons for disabling D-bit dirty logging.

Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is
being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled.
KVM always disables PML when running L2, even when L1 and L2 GPAs are in
the some domain, so failing to write-protect TDP MMU SPTEs will cause
writes made by L2 to not be reflected in the dirty log.

[sean: massage shortlog and changelog, tweak ternary op formatting]
解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接
https://git.kernel.org/stable/c/2673dfb591a359c75080dd5af3da484b89320d22
https://git.kernel.org/stable/c/cdf811a937471af2d1facdf8ae80e5e68096f1ed
https://git.kernel.org/stable/c/e20bff0f1b2de9cfe303dd35ff46470104a87404
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_10 linux * Up to
(excluding)
4.19.304-1
运行在以下环境
系统 debian_11 linux * Up to
(excluding)
5.10.209-2
运行在以下环境
系统 debian_12 linux * Up to
(excluding)
6.1.85-1
运行在以下环境
系统 fedora_38 kernel * Up to
(excluding)
6.8.8-100.fc38
运行在以下环境
系统 fedora_39 kernel * Up to
(excluding)
6.8.8-200.fc39
运行在以下环境
系统 fedora_40 kernel * Up to
(excluding)
6.8.8-300.fc40
CVSS3评分
N/A
  • 攻击路径
    N/A
  • 攻击复杂度
    N/A
  • 权限要求
    N/A
  • 影响范围
    N/A
  • 用户交互
    N/A
  • 可用性
    N/A
  • 保密性
    N/A
  • 完整性
    N/A
N/A
CWE-ID 漏洞类型
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