CVE-2025-40362

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2025-12-16. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

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):

  • Create two file systems in a cluster, say 'fsname1' and 'fsname2'
  • Authorize read only permission to the user 'client.usr' on fs 'fsname1'
$ceph fs authorize fsname1 client.usr / r
  • Authorize read and write permission to the same user 'client.usr' on fs 'fsname2'
$ceph fs authorize fsname2 client.usr / rw
  • 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.

  • Mount the file system 'fsname1' with the user 'client.usr'
$sudo bin/mount.ceph [email protected]=/ /kmnt_fsname1_usr/
  • 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
  • Mount the file system 'fsname1' with the user 'client.admin' and create a
file. $sudo bin/mount.ceph [email protected]=/ /kmnt_fsname1_admin $echo "data" > /kmnt_fsname1_admin/admin_file1
  • 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" ]

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

December 16, 2025

Last Modified

July 30, 2026

Advisory Details (3)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

ceph: fix multifs mds auth caps issue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ca3da8b27ab9a0923ad477447cfb8fc7f4b4c523
generic

ceph: fix multifs mds auth caps issue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22c73d52a6d05c5a2053385c0d6cd9984732799d
generic

ceph: fix multifs mds auth caps issue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/07640d34a781bb2e39020a39137073c03c4aa932

Vendor Advisories for CVE-2025-40362(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oem-6.17 (6.17.0-1011.11) @ noble2026-05-21ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-14.14) @ questing2026-05-21ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1007.7) @ questing2026-05-21ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1008.8) @ questing2026-05-21ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1007.7) @ questing2026-05-21ubuntu
linuxKernel @ 6.12.58—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-08-01 04:15 UTCEPSS rescore
  2. 2026-07-30 16:27 UTCEPSS rescore
  3. 2026-07-30 06:48 UTCEG score recompute
  4. 2026-07-30 06:48 UTCGHSA enrichment
  5. 2026-07-30 06:23 UTCEG score recompute▲ 8.80
  6. 2026-07-30 06:23 UTCGHSA enrichment
  7. 2026-07-30 06:18 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  8. 2026-07-30 01:29 UTCEPSS rescore
  9. 2026-07-28 15:35 UTCEPSS rescore
  10. 2026-07-27 04:39 UTCOSV refresh
  11. 2026-07-26 14:54 UTCEPSS rescore
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  12. 2026-07-09 23:17 UTCOSV refresh
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  43. 2026-06-21 09:31 UTCOSV refresh
  44. 2026-06-21 01:59 UTCEPSS rescore
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  46. 2026-06-19 19:25 UTCEPSS rescore
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  72. 2026-06-01 13:51 UTCEPSS rescore
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  74. 2026-05-31 22:30 UTCEPSS rescore
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Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2025-40362?
CVE-2025-40362 is a high vulnerability published on December 16, 2025. 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…
When was CVE-2025-40362 disclosed?
CVE-2025-40362 was first published in the National Vulnerability Database on December 16, 2025, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-40362 actively exploited?
CVE-2025-40362 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.6% of all scored CVEs.
What is the CVSS score of CVE-2025-40362?
CVE-2025-40362 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2025-40362?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40362, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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