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【已复现】Linux FUSE page cache 越界写本地提权漏洞

  • 2026-08-19 09:20:54
【已复现】Linux FUSE page cache 越界写本地提权漏洞

Linux 内核 FUSE 子系统曝出 page cache 越界写本地权限提升漏洞(CVE-2026-31694,CVSS 7.8),本地攻击者通过构造恶意 FUSE 文件系统目录项数据,可触发内核 page cache 越界写,破坏相邻缓存页面内容,并在特定利用条件下实现 root 权限提升。

利用前置条件:

  • 攻击者需要具备本地执行能力

  • 允许用户挂载或运行受控 FUSE 文件系统

目前 360漏洞挖掘智能体已成功复现该漏洞。本文包含完整影响范围、修复方案、技术原理与复现细节,建议用户立即升级。

漏洞概述

漏洞名称

Linux FUSE page cache 越界写本地提权漏洞

漏洞编号

CVE-2026-31694

公开时间

2026-05-01

POC状态

已公开

漏洞类型

本地权限提升

EXP状态

已公开

利用可能性

技术细节状态

已公开

CVSS 3.1

7.8

在野利用状态

未发现

01

漏洞影响范围

漏洞相关缓存逻辑由commit 69e34551152a286f827d54dcb5700da6aeaac1fb引入;修复 commit 51a8de6c50bf947c8f534cd73da4c8f0a13e7bed 于 2026-04-24 合入主线,首次出现在 v7.1-rc1,正式版本 v7.1 已包含修复。

该漏洞自 Linux 内核 6.15 起引入。已确认的修复情况如下:

  • 在 6.18 分支中,自 6.18.25 起修复

  • 在 7.0 分支中,自 7.0.2 起修复

  • 在 7.1 及后续版本中已全部修复

Linux 内核 6.15 及之后、低于上述修复版本的中间版本均受影响。

已知受影响发行版:

  • Ubuntu

  • Fedora

02

修复建议

正式防护方案

官方修复补丁已经发布,受影响版本请尽快修复。

diff --git a/fs/fuse/readdir.c b/fs/fuse/readdir.cindex c2aae2eef0868..aae657fd56c0e 100644--- a/fs/fuse/readdir.c+++ b/fs/fuse/readdir.c@@ -41,6 +41,10 @@ staticvoidfuse_add_dirent_to_cache(structfile *file,unsigned int offset;void *addr;+  /* Dirent doesn't fit in readdir cache page?  Skip caching. */+  if (reclen > PAGE_SIZE)+    return;+   spin_lock(&fi->rdc.lock);    /*    * Is cache already completed?  Or this entry does not go at the end of

补丁在 fs/fuse/readdir.c 的 fuse_add_dirent_to_cache() 中新增检查:当 reclen > PAGE_SIZE 时直接 return,避免将大于单页的 FUSE dirent 写入 readdir page cache。

03

漏洞描述

CVE-2026-31694 是 Linux 内核 FUSE 子系统中的 page cache 越界写漏洞,问题位于 fs/fuse/readdir.c 的 fuse_add_dirent_to_cache()。该函数从 FUSE 服务端可控的 dirent->namelen 计算序列化目录项长度 reclen,并将目录项复制到单个 page cache 页面中;原逻辑只判断目录项能否放入当前页剩余空间,若放不下就切换到新页,但没有检查单个目录项本身是否大于 PAGE_SIZE。恶意 FUSE 服务端可返回 namelen=4095 的目录项,使 FUSE_DIRENT_SIZE 变为 4120 字节,在 4 KB 页面系统上造成 24 字节可控数据写出到相邻内核页面。

攻击者需要具备本地执行能力,并能挂载或驱动一个恶意 FUSE 文件系统,例如通过 fusermount3 或允许非特权用户命名空间的环境。成功利用后,可通过污染相邻 page cache 页面影响 SUID 程序或敏感文件缓存,实现本地权限提升。

04

漏洞复现

360漏洞研究院已成功复现 Linux FUSE page cache 越界写本地提权漏洞(CVE-2026-31694),实现本地权限提升。

CVE-2026-31694

Linux FUSE page cache 越界写本地提权漏洞复现

05

时间线

2026年7月7日,360漏洞研究院发布本安全风险通告。

06

参考链接

https://nvd.nist.gov/vuln/detail/CVE-2026-31694

https://bynar.io/blog/discovery-validation-in-the-linux-kernel-part-2-fuse-page-cache-overflow

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=51a8de6c50bf947c8f534cd73da4c8f0a13e7bed

07

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  1. CONNECT:[ UseTime:0.000831s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001329s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000769s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001401s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001710s ]
  6. SELECT * FROM `set` [ RunTime:0.000641s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001661s ]
  8. SELECT * FROM `article` WHERE `id` = 503988 LIMIT 1 [ RunTime:0.001191s ]
  9. UPDATE `article` SET `lasttime` = 1787310812 WHERE `id` = 503988 [ RunTime:0.106766s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000514s ]
  11. SELECT * FROM `article` WHERE `id` < 503988 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 503988 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000623s ]
  13. SELECT * FROM `article` WHERE `id` < 503988 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000891s ]
  14. SELECT * FROM `article` WHERE `id` < 503988 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015321s ]
  15. SELECT * FROM `article` WHERE `id` < 503988 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000745s ]
0.210825s