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NVD / CVE Program· CNA Linux

CVE-2023-53695: udf: Detect system inodes linked into directory hierarchy

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.16% (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 1dc71eeb198a8daa17d0c995998a53b0b749a158, 1f328751b65c49c13a312d67a3bf27766b85baf7, 3.18.

Low priority for now. Upgrade to Linux Linux 1dc71eeb198a8daa17d0c995998a53b0b749a158, 1f328751b65c49c13a312d67a3bf27766b85baf7, 3.18 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: udf: Detect system inodes linked into directory hierarchy When UDF filesystem is corrupted, hidden system inodes can be linked into directory hierarchy which is an avenue for further serious corruption of the filesystem and kernel confusion as noticed by syzbot fuzzed images. Refuse to access system inodes linked into directory hierarchy and vice versa.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 22, 2025
Updated
Oct 28, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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.

Follow CVE-2023-53695

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.

—

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

    • 801c7a20d255e300ab51a6fcb1d0e218d136b16f, 3.18affected
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 1dc71eeb198a8daa17d0c995998a53b0b749a158affected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before d747b31e2925a2f384e7dd1901a2e5bc5f984ed8affected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before a44ec34b90440ada190924f5908b97026504fdcdaffected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 37e74003d81e79457535cbbdfa1603431c03fac0affected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 1f328751b65c49c13a312d67a3bf27766b85baf7affected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 9e3b5ef7d02eaa6553e79b4af9bd99227280f245affected · git
    • 6174c2eb8ecef271159bdcde460ce8af54d8f72f and later · before 85a37983ec69cc9fcd188bc37c4de15ee326355aaffected · git
    • 3.17.2 and later · before 3.18affected · semver
    • before 3.18not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.20-16.1.20-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53693Oct 22, 2025 · USB: gadget: Fix the memory leak in raw_gadget driver
    0Monitor
  • ← EarlierCVE-2023-53694Oct 22, 2025 · riscv: ftrace: Fixup panic by disabling preemption
    0Monitor
  • Later →CVE-2023-53696Oct 22, 2025 · scsi: qla2xxx: Fix memory leak in qla2x00_probe_one()
    0Monitor

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 Linux1dc71eeb198a8daa17d0c995998a53b0b749a158Vendor (CNA)
Linux Linux1f328751b65c49c13a312d67a3bf27766b85baf7Vendor (CNA)
Linux Linux3.18Vendor (CNA)
Linux Linux37e74003d81e79457535cbbdfa1603431c03fac0Vendor (CNA)
Linux Linux85a37983ec69cc9fcd188bc37c4de15ee326355aVendor (CNA)
Linux Linux9e3b5ef7d02eaa6553e79b4af9bd99227280f245Vendor (CNA)
Linux Linuxa44ec34b90440ada190924f5908b97026504fdcdVendor (CNA)
Linux Linuxd747b31e2925a2f384e7dd1901a2e5bc5f984ed8Vendor (CNA)
debian:linux6.1.20-1 · 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.

No nightly-computed relations.

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

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records