CVE-2025-68736— landlock: Fix handling of disconnected directories
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Affected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 more rows | |||
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I. Basic Information for CVE-2025-68736
Vulnerability Information
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Vulnerability Title
landlock: Fix handling of disconnected directories
Source: 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.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-68736
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|---|
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Patches & Fixes for CVE-2025-68736 (2)
Other References for CVE-2025-68736 (1)
Same Patch Batch · Linux · 2025-12-24 · 322 CVEs total
| CVE-2025-68741 | 9.8 CRITICAL | scsi: qla2xxx: Fix improper freeing of purex item |
| CVE-2023-53867 | 9.8 CRITICAL | ceph: fix potential use-after-free bug when trimming caps |
| CVE-2025-68745 | 9.8 CRITICAL | scsi: qla2xxx: Clear cmds after chip reset |
| CVE-2025-68726 | 9.8 CRITICAL | crypto: aead - Fix reqsize handling |
| CVE-2023-54094 | 9.8 CRITICAL | net: prevent skb corruption on frag list segmentation |
| CVE-2023-54090 | 9.8 CRITICAL | ixgbe: Fix panic during XDP_TX with > 64 CPUs |
| CVE-2022-50717 | 9.8 CRITICAL | nvmet-tcp: add bounds check on Transfer Tag |
| CVE-2023-54076 | 9.8 CRITICAL | smb: client: fix missed ses refcounting |
| CVE-2025-68359 | 9.8 CRITICAL | btrfs: fix double free of qgroup record after failure to add delayed ref head |
| CVE-2023-53996 | 9.3 CRITICAL | x86/sev: Make enc_dec_hypercall() accept a size instead of npages |
| CVE-2023-54071 | 8.8 HIGH | wifi: rtw88: use work to update rate to avoid RCU warning |
| CVE-2023-54120 | 8.8 HIGH | Bluetooth: Fix race condition in hidp_session_thread |
| CVE-2023-54043 | 8.8 HIGH | iommufd: Do not add the same hwpt to the ioas->hwpt_list twice |
| CVE-2022-50732 | 8.8 HIGH | staging: rtl8192u: Fix use after free in ieee80211_rx() |
| CVE-2023-54092 | 8.8 HIGH | KVM: s390: pv: fix index value of replaced ASCE |
| CVE-2023-54060 | 8.8 HIGH | iommufd: Set end correctly when doing batch carry |
| CVE-2023-54040 | 8.8 HIGH | ice: fix wrong fallback logic for FDIR |
| CVE-2023-53986 | 8.6 HIGH | mips: bmips: BCM6358: disable RAC flush for TP1 |
| CVE-2022-50746 | 8.4 HIGH | erofs: validate the extent length for uncompressed pclusters |
| CVE-2025-68365 | 8.2 HIGH | fs/ntfs3: Initialize allocated memory before use |
Showing top 20 of 322 CVEs. View all on vendor page → →
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Same vendor: Linux
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CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
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bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
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V. Comments for CVE-2025-68736
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