CVE-2026-93066— Linux 内核 x86 内存管理远程代码执行漏洞
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。
在 Linux 内核中，已修复以下漏洞： x86/mm/pat：在 CPA 大页折叠操作期间持有 在启用了 KASAN 的内核构建中，如果在多个 CPU 上并发加载和卸载模块，并在 CPA 页表查找过程中注入短延迟以扩大时间窗口，则在几分钟内就会触发故障： 函数会根据其 4K PTE 重建叶子级 PMD，并释放旧的 PTE 表页；而 则通过无锁的 获取 PTE 指针，稍后才通过 进行写入。当模块代码文本由共享的大页 ROX（只读可执行）映射提供时，两个操作会在同一个 PMD 上并发执行： P 是一个页表页（page
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 41d88484c71cd4f659348da41b7b5b3dbd3be1f6< 591b6fac9df3f43522e8ff6eed8662f8b6f1a124 |
affected |
41d88484c71cd4f659348da41b7b5b3dbd3be1f6< fb97d1d6c20692e15247fa5c8b894b2325e38aee |
affected | ||
41d88484c71cd4f659348da41b7b5b3dbd3be1f6< 1aac65f3e651334259ecb2a5f5ddb81c01f02599 |
affected | ||
6.15 |
affected | ||
< 6.15 |
unaffected | ||
6.18.52≤ 6.18.* |
unaffected | ||
7.2.6≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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一、 漏洞 CVE-2026-93066 基础信息
漏洞信息
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Vulnerability Title
x86/mm/pat: Take cpa_lock around large-page collapse
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
x86/mm/pat: Take cpa_lock around large-page collapse
Loading and unloading modules concurrently on several CPUs on a KASAN
build, with a short delay injected at the CPA page-table lookup to
widen the window, faults within minutes:
BUG: KASAN: use-after-free in __change_page_attr+0x7cc/0x7e0
Write of size 8 at addr ffff888181139718 by task modprobe
...
The buggy address belongs to the physical page:
pfn:0x181139 ... page_type: f2(table)
cpa_collapse_large_pages() rebuilds a leaf PMD from its 4K PTEs and
frees the old PTE-table pages, while __change_page_attr() fetches a
PTE pointer from a lockless lookup_address_in_pgd_attr() and writes
it with set_pte_atomic() only later. When module text is served from
a shared large ROX mapping the two run on the same PMD:
CPU A (module load) CPU B (module finalize)
------------------- -----------------------
execmem_make_temp_rw
set_memory_nx
__change_page_attr
split 2M -> 4K table P
kpte = &P[i] (lockless)
execmem_restore_rox
set_memory_rox (CPA_COLLAPSE)
cpa_collapse_large_pages
rebuild leaf PMD
flush_tlb_all
pagetable_free(P)
set_pte_atomic(kpte, ...)
-> writes into freed P
P is a page-table page (page_type: table), reused at once, so the
write corrupts whatever got the page next: a bad-pte or bad-page
splat, or a fatal fault once P has been turned into read-only text.
The flush_tlb_all() before the free does not close this: its IPI only
serializes against page-table walkers that run with interrupts off
(e.g. GUP-fast); the walk in __change_page_attr() runs with interrupts
on, so nothing stops it from holding a stale pointer into P.
Serialize the collapse - the PMD rebuild, TLB flush and PTE-table
free - under cpa_lock, the same lock __change_page_attr() now takes
unconditionally since commit ("x86/mm/pat: stop gating cpa_lock on
debug_pagealloc_enabled()"), so a concurrent walker can no longer
hold a pointer into a table the collapse is about to free.
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
受影响产品
二、漏洞 CVE-2026-93066 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-93066 补丁与修复 (3)
同批安全公告 · Linux · 2026-09-17 · 共 600 条
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| CVE-2026-90367 | 8.8 HIGH | Linux内核MT7996驱动死锁漏洞 |
| CVE-2026-90329 | 8.8 HIGH | Linux 内核 HID 驱动探测清理同步漏洞 |
| CVE-2026-93189 | 8.8 HIGH | Linux HID核心使用已释放内存漏洞 |
| CVE-2026-90240 | 8.8 HIGH | Linux内核 IOMMU 别名拆除时刷新缓存错误 |
| CVE-2026-90357 | 8.8 HIGH | mt76驱动MT7915无线局域网远程拒绝服务漏洞 |
| CVE-2026-90286 | 8.8 HIGH | AMDGPU GFX6 计算队列PFP使用漏洞 |
| CVE-2026-93042 | 8.8 HIGH | Linux内核dmaengine模块资源耗尽漏洞 |
| CVE-2026-90256 | 8.8 HIGH | Linux Bluetooth L2CAP 远程代码执行漏洞 |
| CVE-2026-90380 | 8.8 HIGH | MT76驱动 mt792x 使用释放后内存漏洞 |
| CVE-2026-90381 | 8.8 HIGH | Linux内核mt76驱动无线信道切换漏洞 |
| CVE-2026-90425 | 8.8 HIGH | Linux内核 5.x 内核漏洞 |
显示前 20 条，共 600 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93066
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