CVE-2026-98992— Linux 命名空间未挂载挂载树复制漏洞
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： 命名空间：禁止复制未卸载的挂载树 函数在检查某个挂载点是否已挂载之前，就允许了根目录为 或 文件的挂载。这一例外情况原本是为了支持 和 挂载而设计的：因为这些挂载不属于任何挂载命名空间，所以 和 都无法通过它们；如果不做特殊处理，就无法对 或 进行绑定挂载（bind-mount）。 然而，问题在于该例外情况也允许对已“惰性卸载”（lazy unmount）但仅由文件描述符保持存活的此类文件进行绑定挂载。具体场景如下： 当使用 或 标志调用 时，它不会在遇到已卸载的挂载点
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e149ed2b805fefdccf7ccdfc19eca22fdd4514ac< 86a2d56b1960720bf1844441c0890621e9db2f25 |
affected |
e149ed2b805fefdccf7ccdfc19eca22fdd4514ac< 7e037b1fd339d865737c8accd29abcf40130a5a0 |
affected | ||
e149ed2b805fefdccf7ccdfc19eca22fdd4514ac< b47b40c4f058418f9707454543179df240796aad |
affected | ||
e149ed2b805fefdccf7ccdfc19eca22fdd4514ac< 8d3527457e183cedee3003c2897314da49488311 |
affected | ||
e149ed2b805fefdccf7ccdfc19eca22fdd4514ac< 8bacbf6be959973b28b691713a872c12eae69eec |
affected | ||
3.19 |
affected | ||
< 3.19 |
unaffected | ||
6.6.160≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-98992 基础信息
漏洞信息
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Vulnerability Title
namespace: don't copy an unmounted mount tree
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
namespace: don't copy an unmounted mount tree
may_copy_tree() accepts a mount whose root is an nsfs or pidfs file
before it checks whether that mount is mounted. This exception exists
for nsfs and pidfs mounts. They are part of no mount namespace so
neither check_mnt() nor is_mounted() would let them through and
bind-mounting a nsfsfd or a pidfd wouldn't work.
Problem is that exception also admits a bind mount of such a file when
it was lazily unmounted and is only kept alive by a file descriptor:
mount --bind /proc/self/ns/net /tmp/x
exec 3< /tmp/x
umount -l /tmp/x
mount --rbind /proc/self/fd/3 /tmp/y
With MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted
mount. It copies every mount that stayed attached to it as well. So if
you have a bunch of overmounts over the nsfsfd or the pidfd the whole
unmounted stack is copied. That's a bug.
So refuse to walk an unmounted tree. Copying its root alone stays
possible. So a bind mount of a namespace that is gone can still be
recreated from a file descriptor on the old one. The file descriptor
pins that mount and its root and __has_locked_children() only reads the
direct children which don't leave the parent's list without
namespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL
and are still walked. Copying an unmounted tree recursively fails with
EINVAL.
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-2026-98992 的公开POC
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CVE-2026-98992 补丁与修复 (5)
同批安全公告 · Linux · 2026-10-23 · 共 217 条
| CVE-2026-98959 | 9.8 CRITICAL | btrfs 扩展属性替换处理远程代码执行漏洞 |
| CVE-2026-99078 | 9.8 CRITICAL | Mellanox mlx5e MPWQE重试时XSK缓冲区释放漏洞 |
| CVE-2026-99079 | 9.8 CRITICAL | Mellanox mlx5e 驱动 XSK 缓冲区释放漏洞 |
| CVE-2026-98988 | 8.8 HIGH | Linux 5.13 命名空间越界漏洞 |
| CVE-2026-99083 | 8.8 HIGH | ksmbd 的 krb5_authenticate() 函数堆越界写漏洞 |
| CVE-2026-99082 | 8.8 HIGH | KVM x86 内存管理漏洞 |
| CVE-2026-98870 | 8.8 HIGH | ksmbd 会话清理时存在通道移除逻辑漏洞 |
| CVE-2026-98980 | 8.8 HIGH | namei 遍历中过度挂载条目信息泄露漏洞 |
| CVE-2026-98981 | 8.8 HIGH | Linux 内核命名空间 dentry 解挂载前未哈希漏洞 |
| CVE-2026-99042 | 8.4 HIGH | io_uring 24 字节 sockaddr_in6 过滤字段填充漏洞 |
| CVE-2026-98978 | 8.4 HIGH | Linux 命名空间 锁定挂载永不失效漏洞 |
| CVE-2026-99064 | 8.1 HIGH | CIPSO 缓存选项偏移调整漏洞 |
| CVE-2026-98968 | 8.1 HIGH | AMT 中继通用查询远程代码执行漏洞 |
| CVE-2026-98944 | 7.8 HIGH | Steam HID 注册重构漏洞 |
| CVE-2026-99053 | 7.8 HIGH | Linux TIPC 节点引用漏洞 |
| CVE-2026-99054 | 7.8 HIGH | Linux TIPC 拓扑服务队列资源泄漏漏洞 |
| CVE-2026-99056 | 7.8 HIGH | strparser 解析器关闭时竞态条件漏洞 |
| CVE-2026-99002 | 7.8 HIGH | vmwgfx 驱动用户空间 pitch 参数验证漏洞 |
| CVE-2026-98899 | 7.8 HIGH | Linux netfilter ipset 竞态条件漏洞 |
| CVE-2026-99006 | 7.8 HIGH | i915 GEM 执行数组越界漏洞 |
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