CVE编号
CVE-2020-29567利用情况
暂无补丁情况
官方补丁披露时间
2020-12-16漏洞描述
An issue was discovered in Xen 4.14.x. When moving IRQs between CPUs to distribute the load of IRQ handling, IRQ vectors are dynamically allocated and de-allocated on the relevant CPUs. De-allocation has to happen when certain constraints are met. If these conditions are not met when first checked, the checking CPU may send an interrupt to itself, in the expectation that this IRQ will be delivered only after the condition preventing the cleanup has cleared. For two specific IRQ vectors, this expectation was violated, resulting in a continuous stream of self-interrupts, which renders the CPU effectively unusable. A domain with a passed through PCI device can cause lockup of a physical CPU, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with physical PCI devices passed through to them can exploit the vulnerability.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://lists.fedoraproject.org/archives/list/[email protected]... | |
| https://security.gentoo.org/glsa/202107-30 | |
| https://xenbits.xenproject.org/xsa/advisory-356.html |
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 | alpine_3.13 | xen | * |
Up to (excluding) 4.14.1-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.14 | xen | * |
Up to (excluding) 4.14.1-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.15 | xen | * |
Up to (excluding) 4.14.1-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_edge | xen | * |
Up to (excluding) 4.14.1-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_33 | xen | * |
Up to (excluding) 4.14.0-14.fc33 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | unionos_20 | xen | * |
Up to (excluding) 4.11.4+37-g3263f257ca-1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | xen | xen | * |
Up to (including) 4.14.0 |
|||||
- 攻击路径 远程
- 攻击复杂度 容易
- 权限要求 无需权限
- 影响范围 有限影响
- EXP成熟度 未验证
- 补丁情况 官方补丁
- 数据保密性 无影响
- 数据完整性 无影响
- 服务器危害 无影响
- 全网数量 N/A
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