CVE-2026-97525— x86/mm/pat：内核页表分裂页表分配漏洞
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：将拆分页表作为内核页表进行分配 当 CPA（当前页属性）代码执行大页拆分（ ）时，PTE 是直接分配的，而未经过标准的页表分配例程（如 ）。 这意味着页表构造函数永远不会被调用，页表也不会被标记为内核页表。 前者导致与该页表关联的 folio 未被标记为页表（因为从未调用 ，因此也未调用 ），同时统计信息也未更新以反映这一事实（未调用 ）。 后者问题——未能将页表标记为内核页表（从未调用 ）——更为严重。 自以下提交以来： ("mm: introduc
影响版本矩阵 9
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b3039c526f3e1744db0cbb7ae1f0213f5e27d3f4< 84e0cd79d57f06b872154eb5d8f610584133f260 |
affected |
5ba2f0a1556479638ac11a3c201421f5515e89f5< 922873cf4fc34124215070a8ad391bf831538bb9 |
affected | ||
5ba2f0a1556479638ac11a3c201421f5515e89f5< 9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4 |
affected | ||
6.18.7< 6.18.53 |
affected | ||
6.19 |
affected | ||
< 6.19 |
unaffected | ||
6.18.53≤ 6.18.* |
unaffected | ||
7.2.7≤ 7.2.* |
unaffected | ||
| … +1 条更多 | |||
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一、 漏洞 CVE-2026-97525 基础信息
漏洞信息
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Vulnerability Title
x86/mm/pat: Allocate split page tables as kernel page tables
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
x86/mm/pat: Allocate split page tables as kernel page tables
A PTE is allocated directly without going through the standard page table
allocation routines (such as pte_alloc_one_kernel()) when the CPA code
splits a large page (__split_large_page()).
This means the page table constructor is never called nor is the page table
marked as a kernel page table.
The former results in the folio associated with the page table not being
marked as a page table (__pagetable_ctor() is never called thus neither is
__folio_set_pgtable()) nor are statistics updated to reflect
it (lruvec_stat_add_folio() is never called).
The latter issue of failing to mark the page table as a kernel page
table (ptdesc_set_kernel() is never called) is far more problematic.
Since commit:
5ba2f0a15564 ("mm: introduce deferred freeing for kernel page tables")
kernel page table freeing has been batched and since the
subsequent commit:
e37d5a2d60a3 ("iommu/sva: invalidate stale IOTLB entries for kernel address space")
IOTLB cache entries for kernel page tables have been invalidated upon
being freed.
Since split page tables are freed without this invalidation, the IOTLB
can contain stale entries for them.
Resolve the issue by using the ordinary PTE allocation API at split time.
This results in these kernel page tables invoking a page table constructor,
and thus requires a page table destructor.
Destructors are not always present, like for early allocated direct map
page tables). Conditionally call pagetable_dtor_free() if the PG_table
folio flag for the ptdesc is set, otherwise we free the page table via
pagetable_free().
Regardless of which path is taken page tables marked as kernel page tables,
which now includes split page tables, take the correct route through
pagetable_free_kernel().
There is a user-visible side effect in that split page tables will appear
in nr_page_table_pages in /proc/vmstat (as do other kernel page tables
allocated after early boot), however this is a positive change.
This issue started being markedly problematic after commit:
5ba2f0a15564 ("mm: introduce deferred freeing for kernel page tables")
so choose this as the Fixes target.
[ dhansen: rephrase in imperative mood ]
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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-2026-97525 的公开POC
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CVE-2026-97525 补丁与修复 (3)
同批安全公告 · Linux · 2026-09-25 · 共 372 条
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt：srpt_alloc_rw_ctxs() 未释放计数器修复 |
| CVE-2026-97957 | 8.8 HIGH | hinic 邮箱段缓冲区溢出漏洞 |
| CVE-2026-97527 | 8.8 HIGH | qla2xxx SCSI驱动程序 NVMe未解决上下文列表竞争条件漏洞 |
| CVE-2026-97528 | 8.8 HIGH | QLogic qla2xxx驱动LS拒绝错误NVMe内存泄漏漏洞 |
| CVE-2026-97555 | 8.8 HIGH | smb客户端：修复DACL所有者/组重写中的堆溢出漏洞 |
| CVE-2026-98115 | 8.8 HIGH | ksmbd 注销期间会话安全排空漏洞 |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en 驱动 bnxt_rx_ring_reset 缓冲区分配失败漏洞 |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: 修复因SW TPA ID绑定问题导致的崩溃漏洞 |
| CVE-2026-98070 | 8.1 HIGH | Linux RDS 模块远程代码执行漏洞 |
| CVE-2026-98069 | 8.1 HIGH | Net/RDS rds_conn_shutdown() 快速路径锁获取漏洞 |
| CVE-2026-98130 | 8.1 HIGH | SCTP定时器启动竞争条件漏洞 |
| CVE-2026-97578 | 7.8 HIGH | Verisilicon VPU981 AV1除数和瓦片缓冲区保护漏洞 |
| CVE-2026-97548 | 7.8 HIGH | XFS rtrmap和rtrefcount _maxlevels_ondisk函数漏洞 |
| CVE-2026-98052 | 7.8 HIGH | Broadcom BCMASP 网卡描述符处理逻辑缺陷 |
| CVE-2026-97611 | 7.8 HIGH | Open vSwitch 使用后释放漏洞 |
| CVE-2026-97612 | 7.8 HIGH | MPLS 协议栈在弹出标签时未清除 inner_protocol |
| CVE-2026-98073 | 7.8 HIGH | Linux 内核网络命名空间更改竞态条件漏洞 |
| CVE-2026-97602 | 7.8 HIGH | Linux内核inet模块队列失效前刷新漏洞 |
| CVE-2026-98112 | 7.8 HIGH | ksmbd 网络接口事件中监听器任务生命周期修复漏洞 |
| CVE-2026-97579 | 7.8 HIGH | 联发科Vcodec AV1 瓷砖起始复制越界漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-97525
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