CVE-2026-23100— 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hugetlb_pmd_shared函数未能正确检测共享，可能导致内存管理错误。
可能的 ATT&CK 技术 1 AI
T1078 · Valid Accounts影响版本矩阵 21
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133< 8ae48255bcb17b32436be97553dca848730d365f |
affected |
8410996eb6fea116fe1483ed977aacf580eee7b4< bf3c2affe245cf831866ddc8f736ae6a22cdc11c |
affected | ||
02333ac1c35370517a19a4a131332a9690c6a5c7< 5b2aec77f92265a9028c5f632bdd9af5b57ec3a3 |
affected | ||
56b274473d6e7e7375f2d0a2b4aca11d67c6b52f< 51dcf459845fd28f5a0d83d408a379b274ec5cc5 |
affected | ||
2e31443a0d18ae43b9d29e02bf0563f07772193d< 3a18b452dd5f7f1652c2e92f8ae769aa17a66c9e |
affected | ||
59d9094df3d79443937add8700b2ef1a866b1081< 69c4e241ff13545d410a8b2a688c932182a858bf |
affected | ||
59d9094df3d79443937add8700b2ef1a866b1081< ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216 |
affected | ||
5.10.239< 5.10.253 |
affected | ||
| … +13 条更多 | |||
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一、 漏洞 CVE-2026-23100 基础信息
漏洞信息
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Vulnerability Title
mm/hugetlb: fix hugetlb_pmd_shared()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/hugetlb: fix hugetlb_pmd_shared()
Patch series "mm/hugetlb: fixes for PMD table sharing (incl. using
mmu_gather)", v3.
One functional fix, one performance regression fix, and two related
comment fixes.
I cleaned up my prototype I recently shared [1] for the performance fix,
deferring most of the cleanups I had in the prototype to a later point.
While doing that I identified the other things.
The goal of this patch set is to be backported to stable trees "fairly"
easily. At least patch #1 and #4.
Patch #1 fixes hugetlb_pmd_shared() not detecting any sharing
Patch #2 + #3 are simple comment fixes that patch #4 interacts with.
Patch #4 is a fix for the reported performance regression due to excessive
IPI broadcasts during fork()+exit().
The last patch is all about TLB flushes, IPIs and mmu_gather.
Read: complicated
There are plenty of cleanups in the future to be had + one reasonable
optimization on x86. But that's all out of scope for this series.
Runtime tested, with a focus on fixing the performance regression using
the original reproducer [2] on x86.
This patch (of 4):
We switched from (wrongly) using the page count to an independent shared
count. Now, shared page tables have a refcount of 1 (excluding
speculative references) and instead use ptdesc->pt_share_count to identify
sharing.
We didn't convert hugetlb_pmd_shared(), so right now, we would never
detect a shared PMD table as such, because sharing/unsharing no longer
touches the refcount of a PMD table.
Page migration, like mbind() or migrate_pages() would allow for migrating
folios mapped into such shared PMD tables, even though the folios are not
exclusive. In smaps we would account them as "private" although they are
"shared", and we would be wrongly setting the PM_MMAP_EXCLUSIVE in the
pagemap interface.
Fix it by properly using ptdesc_pmd_is_shared() in hugetlb_pmd_shared().
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hugetlb_pmd_shared函数未能正确检测共享，可能导致内存管理错误。
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-2026-23100 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-23100 补丁与修复 (1)
同批安全公告 · Linux · 2026-02-04 · 共 79 条
| CVE-2026-23098 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23066 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23074 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23077 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23105 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23103 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23095 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71192 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23065 | Linux kernel 安全漏洞 | |
| CVE-2026-23064 | Linux kernel 安全漏洞 | |
| CVE-2026-23067 | Linux kernel 安全漏洞 | |
| CVE-2026-23059 | Linux kernel 安全漏洞 | |
| CVE-2026-23042 | Linux kernel 安全漏洞 | |
| CVE-2026-23058 | Linux kernel 安全漏洞 | |
| CVE-2026-23057 | Linux kernel 安全漏洞 | |
| CVE-2026-23056 | Linux kernel 安全漏洞 | |
| CVE-2025-71199 | Linux kernel 安全漏洞 | |
| CVE-2025-71198 | Linux kernel 安全漏洞 | |
| CVE-2025-71197 | Linux kernel 安全漏洞 | |
| CVE-2026-23060 | Linux kernel 安全漏洞 |
显示前 20 条，共 79 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-23100
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