CVE-2026-53345— 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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于KVM在VM销毁时错误地警告已脏页但没有运行vCPU，可能导致内存泄漏问题。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 2efd61a608b0039911924d2e5d7028eb37496e85< 033d39e41fc30f484f4e4f37fb4cd76b12cbb18e |
affected |
2efd61a608b0039911924d2e5d7028eb37496e85< 66a8e7ddd901023c89a2733494d827eca3f9c1b0 |
affected | ||
2efd61a608b0039911924d2e5d7028eb37496e85< 343e95c8ecc40e0738975ef4ee24c0c35e800e6b |
affected | ||
2efd61a608b0039911924d2e5d7028eb37496e85< 99d7d43784ae3235026581e9bf892c036e04c8e6 |
affected | ||
2efd61a608b0039911924d2e5d7028eb37496e85< 8618004d3e897c0f1b71d9a9ab860461289bb89a |
affected | ||
5.17 |
affected | ||
< 5.17 |
unaffected | ||
6.6.143≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-53345 基础信息
漏洞信息
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Vulnerability Title
KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying
When marking a page dirty, complain about not having a running/loaded vCPU
if and only if the VM is still alive, i.e. its refcount is non-zero. This
will allow fixing a memory leak for x86 SEV-ES guests without hitting what
is effectively a false positive on the WARN.
For some SEV-ES VM-Exits, KVM keeps a writable mapping of a guest page
across an exit to userspace, and typically unmaps the page on the next
KVM_RUN. But if userspace never calls KVM_RUN after such an exit, then KVM
needs to unmap the page when the vCPU is destroyed, which in turn triggers
the WARN about not having a running vCPU.
Alternatively, SEV-ES could temporarily load the vCPU to suppress the WARN,
as is done in nested_vmx_free_vcpu() (but for completely unrelated reasons;
suppressing WARN from nested_put_vmcs12_pages() is pure happenstance). But
loading a vCPU during destruction is gross (ideally nVMX code would be
cleaned up), risks complicating the SEV-ES code (KVM would need to ensure
the temporarily load()+put() only runs when the vCPU isn't already loaded),
and is ultimately pointless.
The motivation for the WARN is to guard against KVM dirtying guest memory
without pushing the corresponding GFN to the active vCPU's dirty ring, e.g.
to ensure userspace doesn't miss a dirty page. But for the VM's refcount
to reach zero, there can't be _any_ userspace mappings to the dirty ring,
as mapping the dirty ring requires doing mmap() on the vCPU FD. I.e. if
userspace had a valid mapping for the dirty ring, then the vCPU file and
thus the owning VM would still be alive. And so since userspace can't
possibly reach the dirty ring, whether or not KVM technically "misses" a
push to the dirty ring is irrelevant.
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
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于KVM在VM销毁时错误地警告已脏页但没有运行vCPU，可能导致内存泄漏问题。
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-2026-53345 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-53345 补丁与修复 (5)
同批安全公告 · Linux · 2026-07-01 · 共 31 条
| CVE-2026-53355 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53354 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53341 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53356 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53329 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53343 | Linux kernel 安全漏洞 | |
| CVE-2026-53326 | Linux kernel 安全漏洞 | |
| CVE-2026-53328 | Linux kernel 安全漏洞 | |
| CVE-2026-53353 | Linux kernel 安全漏洞 | |
| CVE-2026-53330 | Linux kernel 安全漏洞 | |
| CVE-2026-53352 | Linux kernel 安全漏洞 | |
| CVE-2026-53351 | Linux kernel 安全漏洞 | |
| CVE-2026-53350 | Linux kernel 安全漏洞 | |
| CVE-2026-53348 | Linux kernel 安全漏洞 | |
| CVE-2026-53349 | Linux kernel 安全漏洞 | |
| CVE-2026-53346 | Linux kernel 安全漏洞 | |
| CVE-2026-53347 | Linux kernel 安全漏洞 | |
| CVE-2026-53344 | Linux kernel 安全漏洞 | |
| CVE-2026-53342 | Linux kernel 安全漏洞 | |
| CVE-2026-53327 | Linux kernel 安全漏洞 |
显示前 20 条，共 31 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-53345
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