CVE-2025-68736— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于断开连接目录处理不当，可能导致访问结果不一致和权限扩大。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | cb2c7d1a1776057c9a1f48ed1250d85e94d4850d< 4f5cdc82a6c7e22cfd9a92d203cec13a52a3f363 |
affected |
cb2c7d1a1776057c9a1f48ed1250d85e94d4850d< fbf718d5afe21057694a0c0223a18b0c7a5960b6 |
affected | ||
cb2c7d1a1776057c9a1f48ed1250d85e94d4850d< 426d5b681b2f3339ff04da39b81d71176dc8c87c |
affected | ||
cb2c7d1a1776057c9a1f48ed1250d85e94d4850d< cadb28f8b3fd6908e3051e86158c65c3a8e1c907 |
affected | ||
cb2c7d1a1776057c9a1f48ed1250d85e94d4850d< 49c9e09d961025b22e61ef9ad56aa1c21b6ce2f1 |
affected | ||
5.13 |
affected | ||
< 5.13 |
unaffected | ||
6.1.189≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2025-68736 基础信息
漏洞信息
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Vulnerability Title
landlock: Fix handling of disconnected directories
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
landlock: Fix handling of disconnected directories
Disconnected files or directories can appear when they are visible and
opened from a bind mount, but have been renamed or moved from the source
of the bind mount in a way that makes them inaccessible from the mount
point (i.e. out of scope).
Previously, access rights tied to files or directories opened through a
disconnected directory were collected by walking the related hierarchy
down to the root of the filesystem, without taking into account the
mount point because it couldn't be found. This could lead to
inconsistent access results, potential access right widening, and
hard-to-debug renames, especially since such paths cannot be printed.
For a sandboxed task to create a disconnected directory, it needs to
have write access (i.e. FS_MAKE_REG, FS_REMOVE_FILE, and FS_REFER) to
the underlying source of the bind mount, and read access to the related
mount point. Because a sandboxed task cannot acquire more access
rights than those defined by its Landlock domain, this could lead to
inconsistent access rights due to missing permissions that should be
inherited from the mount point hierarchy, while inheriting permissions
from the filesystem hierarchy hidden by this mount point instead.
Landlock now handles files and directories opened from disconnected
directories by taking into account the filesystem hierarchy when the
mount point is not found in the hierarchy walk, and also always taking
into account the mount point from which these disconnected directories
were opened. This ensures that a rename is not allowed if it would
widen access rights [1].
The rationale is that, even if disconnected hierarchies might not be
visible or accessible to a sandboxed task, relying on the collected
access rights from them improves the guarantee that access rights will
not be widened during a rename because of the access right comparison
between the source and the destination (see LANDLOCK_ACCESS_FS_REFER).
It may look like this would grant more access on disconnected files and
directories, but the security policies are always enforced for all the
evaluated hierarchies. This new behavior should be less surprising to
users and safer from an access control perspective.
Remove a wrong WARN_ON_ONCE() canary in collect_domain_accesses() and
fix the related comment.
Because opened files have their access rights stored in the related file
security properties, there is no impact for disconnected or unlinked
files.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于断开连接目录处理不当，可能导致访问结果不一致和权限扩大。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2025-68736 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-68736 补丁与修复 (2)
CVE-2025-68736 其他参考 (1)
同批安全公告 · Linux · 2025-12-24 · 共 322 条
| CVE-2025-68741 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53867 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68745 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68726 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54094 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54090 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-50717 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54076 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68359 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53996 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-54071 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54120 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54043 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50732 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54092 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54060 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-54040 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53986 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50746 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68365 | 8.2 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 322 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-68736
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