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NVD / CVE Program· CNA Linux

CVE-2026-53167: fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios

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 1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd, 4e14f29473eda18fb2af082dd2fd4c12139862cd, 4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c.

Low priority for now. Upgrade to Linux Linux 1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd, 4e14f29473eda18fb2af082dd2fd4c12139862cd, 4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c 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: limit FUSE_NOTIFY_RETRIEVE to uptodate folios FUSE_NOTIFY_RETRIEVE must be limited to uptodate folios; !uptodate folios can contain uninitialized data. Since FUSE_NOTIFY_RETRIEVE is intended to only return data that is already in the page cache and not wait for data from the FUSE daemon, treat !uptodate folios as if they weren't present. This only has security impact on systems that don't enable automatic zero-initialization of all page allocations via CONFIG_INIT_ON_ALLOC_DEFAULT_ON or init_on_alloc=1.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 15, 2026
EPSS
0.1% · 2th percentile

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%

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • 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

Affected versions

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

  • linux linux kernel2.6.36 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel7.1

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

    • 2.6.36affected
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before feafe8ccb1584254f59fbd4946d6ca7ef1e3e99caffected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 651801d75ad0897dbd331b3cc6a4da3e78f60d42affected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 4e14f29473eda18fb2af082dd2fd4c12139862cdaffected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 8bef2f840b43e0879478fe3aaa9ff2f0b80798a5affected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 68a9282d5ea5b8780d59122505ad633e6daede90affected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 56763afa013444a9d84ca1b74e4b7130942177baaffected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bdaffected · git
    • 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a and later · before 4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276caffected · git
    • before 2.6.36not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.177-16.1.177-1
Debian:13linuxbefore 6.12.95-16.12.95-1
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-2026-53151Jun 25, 2026 · rxrpc: Fix the ACK parser to extract the SACK table for parsing
    39Monitor
  • ← EarlierCVE-2026-53156Jun 25, 2026 · nvmem: core: fix use-after-free bugs in error paths
    31Monitor
  • Later →CVE-2026-53168Jun 25, 2026 · fuse: reject fuse_notify() pagecache ops on directories
    22Monitor

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 Linux1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bdVendor (CNA)
Linux Linux4e14f29473eda18fb2af082dd2fd4c12139862cdVendor (CNA)
Linux Linux4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276cVendor (CNA)
Linux Linux56763afa013444a9d84ca1b74e4b7130942177baVendor (CNA)
Linux Linux651801d75ad0897dbd331b3cc6a4da3e78f60d42Vendor (CNA)
Linux Linux68a9282d5ea5b8780d59122505ad633e6daede90Vendor (CNA)
Linux Linux8bef2f840b43e0879478fe3aaa9ff2f0b80798a5Vendor (CNA)
Linux Linuxfeafe8ccb1584254f59fbd4946d6ca7ef1e3e99cVendor (CNA)
debian:linux6.1.177-1 · 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-529891 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • CVE-2026-532250 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2026-531700 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-4313950 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor
  • CVE-2026-4329148 days apartnet: nfc: nci: Fix parameter validation for packet data
    33Monitor
  • CVE-2026-6387024 days apartieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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)

CWE-908 · Use of Uninitialized Resource

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

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

All records