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NVD / CVE Program· CNA Linux

CVE-2026-53168: fuse: reject fuse_notify() pagecache ops on directories

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 12df4cfa738aefff21756728e91056d7defb0fe6, 15487f98863dc7156ed43c5be26d478beb82ba35, 99c317d7f8b7bbf3de16d20a01f363e390114cea; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 12df4cfa738aefff21756728e91056d7defb0fe6, 15487f98863dc7156ed43c5be26d478beb82ba35, 99c317d7f8b7bbf3de16d20a01f363e390114cea; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: fuse: reject fuse_notify() pagecache ops on directories The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the FUSE daemon to actively write/read pagecache contents. For directories with FOPEN_CACHE_DIR, the pagecache is used as kernel-internal cache storage, and userspace is not supposed to have direct access to this cache - in particular, fuse_parse_cache() will hit WARN_ON() if the cache contains bogus data. Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than regular files with -EINVAL.

Published
Jun 25, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.20affected
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before 15487f98863dc7156ed43c5be26d478beb82ba35affected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before bd23fa0c16c5c86e5b7713224ffbb87d9db81ccaaffected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6affected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before dd92773d4d9cea010474eb08a5133c14ff6ab53aaffected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before 99c317d7f8b7bbf3de16d20a01f363e390114ceaaffected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before 12df4cfa738aefff21756728e91056d7defb0fe6affected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before e692f0cb86204dcdb9dddc0b355407eda6394a67affected · git
    • 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 and later · before 9c954499d43aefac01c5dfb57a82b13d2dcf4b94affected · git
    • before 4.20not affected · semver
Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.20 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel7.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.13-17.0.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53164Jun 25, 2026 · iommu/dma: Do not try to iommu_map a 0 length region in swiotlb
    22Monitor
  • ← EarlierCVE-2026-53167Jun 25, 2026 · fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios
    22Monitor
  • Later →CVE-2026-53176Jun 25, 2026 · IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux12df4cfa738aefff21756728e91056d7defb0fe6Vendor (CNA)
Linux Linux15487f98863dc7156ed43c5be26d478beb82ba35Vendor (CNA)
Linux Linux99c317d7f8b7bbf3de16d20a01f363e390114ceaVendor (CNA)
Linux Linux9c954499d43aefac01c5dfb57a82b13d2dcf4b94Vendor (CNA)
Linux Linux9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6Vendor (CNA)
Linux Linuxbd23fa0c16c5c86e5b7713224ffbb87d9db81ccaVendor (CNA)
Linux Linuxdd92773d4d9cea010474eb08a5133c14ff6ab53aVendor (CNA)
Linux Linuxe692f0cb86204dcdb9dddc0b355407eda6394a67Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records