CVE-2025-37964— 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TLB刷新窗口过窄，可能导致跳过必要的刷新。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 848b5815177582de0e1d0118725378e0fbadca20< 12f703811af043d32b1c8a30001b2fa04d5cd0ac |
affected |
b47002ed65ade940839b7f439ff4a194e7d5ec28< 02ad4ce144bd27f71f583f667fdf3b3ba0753477 |
affected | ||
a04fe3bfc71e28009e20357b79df1e8ef7c9d600< d41072906abec8bb8e01ed16afefbaa558908c89 |
affected | ||
3dbe889a1b829b4c07e0836ff853fe649e51ce4f< d87392094f96e162fa5fa5a8640d70cc0952806f |
affected | ||
6db2526c1d694c91c6e05e2f186c085e9460f202< 399ec9ca8fc4999e676ff89a90184ec40031cf59 |
affected | ||
6db2526c1d694c91c6e05e2f186c085e9460f202< fea4e317f9e7e1f449ce90dedc27a2d2a95bee5a |
affected | ||
d1347977661342cb09a304a17701eb2d4aa21dec |
affected | ||
5.15.179< 5.15.183 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2025-37964 基础信息
漏洞信息
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Vulnerability Title
x86/mm: Eliminate window where TLB flushes may be inadvertently skipped
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
x86/mm: Eliminate window where TLB flushes may be inadvertently skipped
tl;dr: There is a window in the mm switching code where the new CR3 is
set and the CPU should be getting TLB flushes for the new mm. But
should_flush_tlb() has a bug and suppresses the flush. Fix it by
widening the window where should_flush_tlb() sends an IPI.
Long Version:
=== History ===
There were a few things leading up to this.
First, updating mm_cpumask() was observed to be too expensive, so it was
made lazier. But being lazy caused too many unnecessary IPIs to CPUs
due to the now-lazy mm_cpumask(). So code was added to cull
mm_cpumask() periodically[2]. But that culling was a bit too aggressive
and skipped sending TLB flushes to CPUs that need them. So here we are
again.
=== Problem ===
The too-aggressive code in should_flush_tlb() strikes in this window:
// Turn on IPIs for this CPU/mm combination, but only
// if should_flush_tlb() agrees:
cpumask_set_cpu(cpu, mm_cpumask(next));
next_tlb_gen = atomic64_read(&next->context.tlb_gen);
choose_new_asid(next, next_tlb_gen, &new_asid, &need_flush);
load_new_mm_cr3(need_flush);
// ^ After 'need_flush' is set to false, IPIs *MUST*
// be sent to this CPU and not be ignored.
this_cpu_write(cpu_tlbstate.loaded_mm, next);
// ^ Not until this point does should_flush_tlb()
// become true!
should_flush_tlb() will suppress TLB flushes between load_new_mm_cr3()
and writing to 'loaded_mm', which is a window where they should not be
suppressed. Whoops.
=== Solution ===
Thankfully, the fuzzy "just about to write CR3" window is already marked
with loaded_mm==LOADED_MM_SWITCHING. Simply checking for that state in
should_flush_tlb() is sufficient to ensure that the CPU is targeted with
an IPI.
This will cause more TLB flush IPIs. But the window is relatively small
and I do not expect this to cause any kind of measurable performance
impact.
Update the comment where LOADED_MM_SWITCHING is written since it grew
yet another user.
Peter Z also raised a concern that should_flush_tlb() might not observe
'loaded_mm' and 'is_lazy' in the same order that switch_mm_irqs_off()
writes them. Add a barrier to ensure that they are observed in the
order they are written.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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TLB刷新窗口过窄，可能导致跳过必要的刷新。
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-2025-37964 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 · 2025-05-20 · 共 95 条
| CVE-2025-37894 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-37924 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-37935 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-37959 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-37926 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37899 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37918 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37943 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37944 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37947 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37952 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37956 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37957 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37936 | 8.7 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37973 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37903 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37906 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37921 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37923 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37920 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 95 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-37964
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