CVE-2026-98987— Linux 命名空间挂载点遍历漏洞
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，以下漏洞已被修复： 命名空间：检查挂载命名空间文件的最顶层挂载 函数会预先为源挂载的最顶层挂载的根目录分配一个挂载点，以便将原本位于目标位置的挂载叠加到源挂载之上，或者叠加到其传播副本之上。 在创建这些副本时，并未设置 标志，因此副本的覆盖挂载（overmounts）链比源挂载的链更短。该链在第一个挂载命名空间文件的绑定挂载处终止。因此，当循环向上遍历源挂载链时，它会记住该挂载的挂载点（保存在 变量中），并将现有挂载放置到该位置以用于副本。 然而，该循环在到达最顶层挂载时便终止，却从未检查该
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 96f5d2e051653f2cfe9137c5d3c7794c358ffb03< b9c40553f6ceba50042281eef6f701e5fb719726 |
affected |
96f5d2e051653f2cfe9137c5d3c7794c358ffb03< 87ecd4c6da146363384a603bd9e90c90e7275536 |
affected | ||
96f5d2e051653f2cfe9137c5d3c7794c358ffb03< 8714b44adac7b10506e1db3ef1710689751f0f10 |
affected | ||
6.17 |
affected | ||
< 6.17 |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
7.2.11≤ 7.2.* |
unaffected | ||
7.3≤ * |
unaffected |
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一、 漏洞 CVE-2026-98987 基础信息
漏洞信息
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Vulnerability Title
namespace: look at the topmost mount for a mount namespace file
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
namespace: look at the topmost mount for a mount namespace file
attach_recursive_mnt() preallocates a mountpoint for the root of the
topmost mount of the source so that a mount that already sits at the
destination can be put on top of the source or on top of one of its
propagated copies.
The copies are made without CL_COPY_MNT_NS_FILE so their chain of
overmounts is shorter than the source's. It ends below the first bind
mount of a mount namespace file. So while the loop walks up the chain of
the source it remembers the mountpoint of that mount in "shorter" and
the existing mount is put there for the copies.
But the loop ends at the topmost mount without ever looking at it. If
the topmost mount is the only mount namespace file in the chain
"shorter" stays NULL and mnt_change_mountpoint() attaches the existing
mount of the copy below the root of the mount namespace file. That's a
dentry of nsfs. No path walk in the copy's mount namespace ever gets
there. The mount is gone until its parent goes and the copy that took
its place can't be unmounted synchronously because it has a child:
S bind mount of a file
N bind mount of a mount namespace file on top of S
A shared mount, B a slave of A, Q mounted on B/file
move_mount(S, A/file)
cat B/file -> the content of S instead of Q
umount B/file -> EBUSY
Look at every mount of the chain including the topmost one.
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-2026-98987 的公开POC
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CVE-2026-98987 补丁与修复 (2)
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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