CVE-2026-68086— 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基金会开源的一个操作系统内核。 Linux kernel 5.4版本存在安全漏洞，该漏洞源于mm/khugepaged组件在折叠文件THP时未正确写入所有脏文件folio，可能导致数据丢失。
可能的 ATT&CK 技术 1 AI
T1485 · Data Destruction
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一、 漏洞 CVE-2026-68086 基础信息
漏洞信息
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Vulnerability Title
mm/khugepaged: write all dirty file folios when collapsing
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/khugepaged: write all dirty file folios when collapsing
[There is no upstream commit, as this code was removed by upstream
commit 044925f9b565 ("mm: fs: remove filemap_nr_thps*() functions and their users")]
As-is, khugepaged and writable-file opening exclude each other. A file
cannot be open writeable and have THPs (because the filesystem is not aware
of them). khugepaged will never collapse file pages for files that are
opened writeable. On an open(O_RDWR/O_WRONLY), the page cache for that
particular file is dropped. This is fine because nothing could've been
dirtied.
However, there is an edge-case: collapse_file() might not be able to
coexist with concurrent writers, but it can coexist with dirty folios
(from previous writers). Therefore, the following can happen:
open(file, O_RDWR)
write(file)
close(file)
madvise(file_mapping, MADV_COLLAPSE, some non-dirty range)
open(file, O_RDWR)
nr_thps > 0
truncate_inode_pages()
/* THPs are cleared out, but so are the dirty folios */
When this edge-case happens, there is data loss, as the dirty folios are
fully discarded.
Fix it by fully writing back the page cache (and waiting) when collapsing
file THPs. Doing so provides the guarantee that no dirty folio will be
observed while there are active THPs. To fully ensure this is safe, the
invalidate_lock needs to be held while doing the writeout, so that
do_dentry_open()'s page cache truncation excludes this write-and-wait.
As a side effect, move the nr_thps counter bumping outside the i_pages
lock. This is correct since the counter itself is an atomic_t and the
producer <-> consumer correctness is provided by a full memory barrier:
smp_mb() in collapse_file()/memory barrier implied by full ordering in
get_write_access() -> atomic_inc_unless_negative().
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基金会开源的一个操作系统内核。 Linux kernel 5.4版本存在安全漏洞，该漏洞源于mm/khugepaged组件在折叠文件THP时未正确写入所有脏文件folio，可能导致数据丢失。
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-2026-68086 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-68086 补丁与修复 (1)
同批安全公告 · Linux · 2026-08-10 · 共 344 条
| CVE-2026-68159 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68381 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68385 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68388 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68117 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68170 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68123 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68161 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68127 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68160 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68144 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68302 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68300 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68426 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68136 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68154 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68158 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68156 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68124 | 9.6 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 344 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-68086
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