CVE-2026-99084— readdir 不可变目录远程代码执行漏洞
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，以下漏洞已得到修复： readdir：对不可变目录不再获取 inode 锁 会获取目录的 共享锁，并在整个 调用期间持有该锁。对于那些从未包含任何条目且永远不会被删除的目录而言，该锁实际上并未保护任何可变状态，其作用仅仅是让该 inode 的所有读操作和写操作按顺序排队。 这对 nullfs 实例的目录尤为关键。初始挂载命名空间的实例是所有空挂载命名空间的根目录，而私有实例则是所有内核线程的根目录。因此，同一个 inode 被多个彼此无其他关联的用户共享。如果某个读取操作可以任意长时间地持有
可能的 ATT&CK 技术 1 AI
T1499.003 · Application Exhaustion Flood
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-99084 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
readdir: take no inode lock on an immutable directory
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
readdir: take no inode lock on an immutable directory
iterate_dir() takes the directory's i_rwsem shared and holds it across
->iterate_shared(). For a directory that never has an entry and is
never removed the lock keeps nothing still, it only orders every reader
and every writer of that inode behind each other.
For the directory of a nullfs instance that matters. The instance of
the initial mount namespace is the root of every empty mount namespace
and the private instance is the root of every kernel thread, so one
inode is shared across users who have nothing else in common. And a
reader can hold the lock for as long as it likes: back the getdents()
buffer with a mapping of a file on a FUSE mount of your own, let the
copy of "." and ".." fault and let the server wait. Queue an exclusive
taker behind it, a mkdir() in that directory goes through start_dirop()
before the read-only mount is reported, and from then on every lookup
that misses the dcache in that directory, every create and every mount
on it waits until the server answers. One user of an empty mount
namespace stalls all the others.
Add FOP_IMMUTABLE for the file operations of a directory that never
changes and is never removed and let iterate_dir() skip the lock for
it. The flag never changes for a file, ->f_pos is protected by
f_pos_lock since directories are FMODE_ATOMIC_POS, IS_DEADDIR can't be
set on such a directory and neither touch_atime() nor fsnotify take
i_rwsem. Set it on the nullfs directory. The placeholder directories of
libfs never have an entry either but their owners remove them, so they
keep the lock.
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-2026-99084 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-99084 的情报信息
请登录查看更多情报信息。
CVE-2026-99084 其他参考 (2)
同批安全公告 · Linux · 2026-10-23 · 共 218 条
| CVE-2026-98937 | Linux 内核 perf 远程代码执行漏洞 | |
| CVE-2026-98950 | Linux kernel flow_dissector 整数截断漏洞 | |
| CVE-2026-98949 | Imagination DRM 驱动 remap() 函数引用及 vm_bo 处理漏洞 | |
| CVE-2026-98948 | Mellanox mlxsw 端口范围寄存器泄漏漏洞 | |
| CVE-2026-98947 | vsock 内存泄漏漏洞 | |
| CVE-2026-98946 | V3D 驱动运行时挂起中断禁用漏洞 | |
| CVE-2026-98945 | Steam HID 驱动解绑顺序漏洞 | |
| CVE-2026-98944 | Steam HID 注册重构漏洞 | |
| CVE-2026-98943 | Steam HID 驱动锁清理 | |
| CVE-2026-98942 | Linux 内核 sched_ext 远程代码执行漏洞 | |
| CVE-2026-98941 | ext4 加密 inode 大页启用逻辑漏洞 | |
| CVE-2026-98940 | Linux 内核 ASoC 组件越界读取漏洞 | |
| CVE-2026-98939 | Linux x86/mm 内存管理逻辑缺陷 | |
| CVE-2026-98938 | Rust IRQ 请求机制参数传递漏洞 | |
| CVE-2026-98926 | AMD Display 驱动 DPMS 电源管理漏洞 | |
| CVE-2026-98929 | macsec 在注册前初始化 SecY 的竞态条件漏洞 | |
| CVE-2026-98928 | KVM arm64 信息泄露漏洞 | |
| CVE-2026-98927 | KVM arm64 嵌套 MMU 数组生命周期漏洞 | |
| CVE-2026-98930 | KVM s390 中断注入漏洞 | |
| CVE-2026-98925 | Linux bpf sockmap 序列号重复计数漏洞 |
显示前 20 条，共 218 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-99084
暂无评论