CVE-2025-40362— ceph: fix multifs mds auth caps issue
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，该漏洞源于多文件系统认证检查不足，可能导致权限提升。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1078 · Valid AccountsAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 596afb0b8933ba6ed7227adcc538db26feb25c74< 07640d34a781bb2e39020a39137073c03c4aa932 |
affected |
596afb0b8933ba6ed7227adcc538db26feb25c74< ca3da8b27ab9a0923ad477447cfb8fc7f4b4c523 |
affected | ||
596afb0b8933ba6ed7227adcc538db26feb25c74< 22c73d52a6d05c5a2053385c0d6cd9984732799d |
affected | ||
6.10 |
affected | ||
< 6.10 |
unaffected | ||
6.12.58≤ 6.12.* |
unaffected | ||
6.17.8≤ 6.17.* |
unaffected | ||
6.18≤ * |
unaffected |
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I. Basic Information for CVE-2025-40362
Vulnerability Information
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Vulnerability Title
ceph: fix multifs mds auth caps issue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ceph: fix multifs mds auth caps issue
The mds auth caps check should also validate the
fsname along with the associated caps. Not doing
so would result in applying the mds auth caps of
one fs on to the other fs in a multifs ceph cluster.
The bug causes multiple issues w.r.t user
authentication, following is one such example.
Steps to Reproduce (on vstart cluster):
1. Create two file systems in a cluster, say 'fsname1' and 'fsname2'
2. Authorize read only permission to the user 'client.usr' on fs 'fsname1'
$ceph fs authorize fsname1 client.usr / r
3. Authorize read and write permission to the same user 'client.usr' on fs 'fsname2'
$ceph fs authorize fsname2 client.usr / rw
4. Update the keyring
$ceph auth get client.usr >> ./keyring
With above permssions for the user 'client.usr', following is the
expectation.
a. The 'client.usr' should be able to only read the contents
and not allowed to create or delete files on file system 'fsname1'.
b. The 'client.usr' should be able to read/write on file system 'fsname2'.
But, with this bug, the 'client.usr' is allowed to read/write on file
system 'fsname1'. See below.
5. Mount the file system 'fsname1' with the user 'client.usr'
$sudo bin/mount.ceph usr@.fsname1=/ /kmnt_fsname1_usr/
6. Try creating a file on file system 'fsname1' with user 'client.usr'. This
should fail but passes with this bug.
$touch /kmnt_fsname1_usr/file1
7. Mount the file system 'fsname1' with the user 'client.admin' and create a
file.
$sudo bin/mount.ceph admin@.fsname1=/ /kmnt_fsname1_admin
$echo "data" > /kmnt_fsname1_admin/admin_file1
8. Try removing an existing file on file system 'fsname1' with the user
'client.usr'. This shoudn't succeed but succeeds with the bug.
$rm -f /kmnt_fsname1_usr/admin_file1
For more information, please take a look at the corresponding mds/fuse patch
and tests added by looking into the tracker mentioned below.
v2: Fix a possible null dereference in doutc
v3: Don't store fsname from mdsmap, validate against
ceph_mount_options's fsname and use it
v4: Code refactor, better warning message and
fix possible compiler warning
[ Slava.Dubeyko: "fsname check failed" -> "fsname mismatch" ]
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，该漏洞源于多文件系统认证检查不足，可能导致权限提升。
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-2025-40362
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2025-40362 (3)
Same Patch Batch · Linux · 2025-12-16 · 156 CVEs total
| CVE-2025-68192 | 9.8 CRITICAL | net: usb: qmi_wwan: initialize MAC header offset in qmimux_rx_fixup |
| CVE-2025-68301 | 9.8 CRITICAL | net: atlantic: fix fragment overflow handling in RX path |
| CVE-2025-40350 | 9.8 CRITICAL | net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ |
| CVE-2025-68284 | 9.8 CRITICAL | libceph: prevent potential out-of-bounds writes in handle_auth_session_key() |
| CVE-2025-68285 | 9.8 CRITICAL | libceph: fix potential use-after-free in have_mon_and_osd_map() |
| CVE-2025-68263 | 9.8 CRITICAL | ksmbd: ipc: fix use-after-free in ipc_msg_send_request |
| CVE-2025-68315 | 9.8 CRITICAL | f2fs: fix to detect potential corrupted nid in free_nid_list |
| CVE-2025-68304 | 8.8 HIGH | Bluetooth: hci_core: lookup hci_conn on RX path on protocol side |
| CVE-2025-68256 | 8.8 HIGH | staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser |
| CVE-2025-68255 | 8.8 HIGH | staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing |
| CVE-2025-68226 | 8.8 HIGH | smb: client: fix incomplete backport in cfids_invalidation_worker() |
| CVE-2025-68314 | 8.8 HIGH | drm/msm: make sure last_fence is always updated |
| CVE-2025-68250 | 8.2 HIGH | hung_task: fix warnings caused by unaligned lock pointers |
| CVE-2025-68179 | 7.8 HIGH | s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP |
| CVE-2025-68260 | 7.8 HIGH | rust_binder: fix race condition on death_list |
| CVE-2025-68181 | 7.8 HIGH | drm/radeon: Remove calls to drm_put_dev() |
| CVE-2025-68294 | 7.8 HIGH | io_uring/net: ensure vectored buffer node import is tied to notification |
| CVE-2025-68183 | 7.8 HIGH | ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr |
| CVE-2025-68234 | 7.8 HIGH | io_uring/cmd_net: fix wrong argument types for skb_queue_splice() |
| CVE-2025-68212 | 7.8 HIGH | fs: Fix uninitialized 'offp' in statmount_string() |
Showing top 20 of 156 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-40362
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