CVE-2026-98991— Linux 内核队列命名空间挂载通知重复漏洞
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：确保每个挂载点仅被加入一次挂载通知队列 函数会将挂载点加入 链表，但它并未检查该挂载点是否已存在于该链表中。只要每个挂载点在每次持有 锁期间最多被加入一次队列，这种做法是安全的；然而实际情况并非如此。 函数会将幸存的覆盖挂载（overmount）从即将被移除的挂载栈中移出，并将其标记为“已移动”并加入队列。 和 函数会在单次持有 锁期间，对多个挂载点调用 。因此，第二次调用 可能会移除第一次调用刚刚重新父化（reparented）的挂载点，再次对其执行重新父化
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | bf630c40164162ba1d3933c2f5e3397d083e0948< acbe9e4418e2ef7bef1a12e62e0e7d6145a15190 |
affected |
bf630c40164162ba1d3933c2f5e3397d083e0948< 702ff3fe499876e09c45558a05366d21a5bc41ab |
affected | ||
bf630c40164162ba1d3933c2f5e3397d083e0948< bd2feb7796b6585938a4241e7b7c4148a6f7b762 |
affected | ||
6.15 |
affected | ||
< 6.15 |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
7.2.11≤ 7.2.* |
unaffected | ||
7.3≤ * |
unaffected |
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一、 漏洞 CVE-2026-98991 基础信息
漏洞信息
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Vulnerability Title
namespace: queue a mount only once for mount notifications
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
namespace: queue a mount only once for mount notifications
mnt_notify_add() puts a mount on notify_list. It doesn't check whether
the mount is on the list already. That's fine as long as every mount is
queued at most once per namespace_sem hold. It isn't.
propagate_umount() moves a surviving overmount off a stack of mounts
that are going away and queues it as moved. shrink_submounts() and
mark_mounts_for_expiry() call umount_tree() for several mounts under a
single namespace_sem hold. So the second umount_tree() can take down
exactly the mount the first one reparented, reparent it once more and so
end up queueing it a second time.
The second list_add_tail() cuts the mounts queued in between out of the
list while the head still points at the last of them. notify_mnt_list()
then only visits that one mount and the others are freed after the grace
period with notify_list still pointing at them. Every later mount
operation on the host walks freed memory:
BUG: KASAN: slab-use-after-free in __list_add_valid_or_report
Read of size 8 at addr ffff8881003d57e0 by task notify_dq/162
__list_add_valid_or_report+0x15c/0x1a0
mnt_add_to_ns+0x322/0x890
attach_recursive_mnt.isra.0+0xf2a/0x1a00
path_mount+0x139c/0x1d40
This needs a mount with MNT_SHRINKABLE to bind from. That's what
finish_automount() creates (submounts of NFS, AFS and CIFS and the
tracefs mount below debugfs). Bind mounts inherit the flag. A mount
namespace with a FAN_MARK_MNTNS mark does the rest and root in a user
namespace can have both.
Initialize to_notify in alloc_vfsmnt() and leave a mount alone that is
queued already. mnt_notify() looks at the state the mount has when the
list is drained so a single entry per mount is enough. The move event
for a mount that is unmounted under the same hold is lost. That's fine.
The detach is what matters.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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-2026-98991 的公开POC
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|---|
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CVE-2026-98991 补丁与修复 (2)
同批安全公告 · Linux · 2026-10-23 · 共 218 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-2026-99079 | 9.8 CRITICAL | Mellanox mlx5e 驱动 XSK 缓冲区释放漏洞 |
| CVE-2026-99078 | 9.8 CRITICAL | Mellanox mlx5e MPWQE重试时XSK缓冲区释放漏洞 |
| 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-2026-99083 | 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-2026-98981 | 8.8 HIGH | Linux 内核命名空间 dentry 解挂载前未哈希漏洞 |
| CVE-2026-98988 | 8.8 HIGH | Linux 5.13 命名空间越界漏洞 |
| CVE-2026-98978 | 8.4 HIGH | Linux 命名空间 锁定挂载永不失效漏洞 |
| CVE-2026-99042 | 8.4 HIGH | io_uring 24 字节 sockaddr_in6 过滤字段填充漏洞 |
| CVE-2026-98968 | 8.1 HIGH | AMT 中继通用查询远程代码执行漏洞 |
| CVE-2026-99064 | 8.1 HIGH | CIPSO 缓存选项偏移调整漏洞 |
| CVE-2026-99051 | 7.8 HIGH | fsverity 信息结构释放延迟漏洞 |
| CVE-2026-99050 | 7.8 HIGH | GPIO MPSSE 驱动 IRQ 轮询竞态漏洞 |
| CVE-2026-98975 | 7.8 HIGH | XFS 文件系统 reflink 标志交换逻辑漏洞 |
| 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-2026-98974 | 7.8 HIGH | XFS 文件系统范围交换到文件末尾大小漏洞 |
| CVE-2026-98944 | 7.8 HIGH | Steam HID 注册重构漏洞 |
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