CVE-2026-31561— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FRED CR4位被加入CR4固定位掩码，导致在AP初始化期间异常无法处理，可能引发三重故障。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ff45746fbf005f96e42bea466698e3fdbf926013< d7853d9fe94abf43b46c57b0b7f8418198b7615a |
affected |
ff45746fbf005f96e42bea466698e3fdbf926013< a6e14114684d2324e5401617d6d01acb4a4e0e22 |
affected | ||
ff45746fbf005f96e42bea466698e3fdbf926013< 00d956dafa76f86a73424fe5cce3d604a8be2e4b |
affected | ||
ff45746fbf005f96e42bea466698e3fdbf926013< 411df123c017169922cc767affce76282b8e6c85 |
affected | ||
6.9 |
affected | ||
< 6.9 |
unaffected | ||
6.12.80≤ 6.12.* |
unaffected | ||
6.18.21≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-31561 基础信息
漏洞信息
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Vulnerability Title
x86/cpu: Remove X86_CR4_FRED from the CR4 pinned bits mask
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
x86/cpu: Remove X86_CR4_FRED from the CR4 pinned bits mask
Commit in Fixes added the FRED CR4 bit to the CR4 pinned bits mask so
that whenever something else modifies CR4, that bit remains set. Which
in itself is a perfectly fine idea.
However, there's an issue when during boot FRED is initialized: first on
the BSP and later on the APs. Thus, there's a window in time when
exceptions cannot be handled.
This becomes particularly nasty when running as SEV-{ES,SNP} or TDX
guests which, when they manage to trigger exceptions during that short
window described above, triple fault due to FRED MSRs not being set up
yet.
See Link tag below for a much more detailed explanation of the
situation.
So, as a result, the commit in that Link URL tried to address this
shortcoming by temporarily disabling CR4 pinning when an AP is not
online yet.
However, that is a problem in itself because in this case, an attack on
the kernel needs to only modify the online bit - a single bit in RW
memory - and then disable CR4 pinning and then disable SM*P, leading to
more and worse things to happen to the system.
So, instead, remove the FRED bit from the CR4 pinning mask, thus
obviating the need to temporarily disable CR4 pinning.
If someone manages to disable FRED when poking at CR4, then
idt_invalidate() would make sure the system would crash'n'burn on the
first exception triggered, which is a much better outcome security-wise.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FRED CR4位被加入CR4固定位掩码，导致在AP初始化期间异常无法处理，可能引发三重故障。
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-2026-31561 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-24 · 共 138 条
| CVE-2026-31609 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31608 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31657 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31633 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31607 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31669 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31668 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31659 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31589 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31637 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31649 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31636 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31553 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31629 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31588 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31570 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31558 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31622 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31611 | 8.6 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 138 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31561
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