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NVD / CVE Program· CNA Linux

CVE-2023-4130: ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()

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: 0.50% (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 4bf629262f9118ee91b1c3a518ebf2b3bcb22180, 79ed288cef201f1f212dfb934bcaac75572fb8f6, aeb974907642be095e38ecb1a400ca583958b2b0.
  • Severity is disputed: the assigning authority (CNA) scores it 8.1, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 4bf629262f9118ee91b1c3a518ebf2b3bcb22180, 79ed288cef201f1f212dfb934bcaac75572fb8f6, aeb974907642be095e38ecb1a400ca583958b2b0 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: ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea() There are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request from client. ksmbd find next smb2_ea_info using ->NextEntryOffset of current smb2_ea_info. ksmbd need to validate buffer length Before accessing the next ea. ksmbd should check buffer length using buf_len, not next variable. next is the start offset of current ea that got from previous ea.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 16, 2025
Updated
Aug 15, 2026
EPSS
0.5% · 43th 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 · 0.5%

CNA vs NVD score

NVD
5.5
CNA · Linux
8.1
2.6 point gap

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

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

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  • 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 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 kernel5.15 and later · before 5.15.127
  • linux linux kernel5.16 and later · before 6.1.46
  • linux linux kernel6.2 and later · before 6.4.11
  • linux linux kernel6.5

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

    • 5.15affected
    • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before aeb974907642be095e38ecb1a400ca583958b2b0affected · git
    • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before f339d76a3a972601d0738b881b099d49ebbdc3a2affected · git
    • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 4bf629262f9118ee91b1c3a518ebf2b3bcb22180affected · git
    • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 79ed288cef201f1f212dfb934bcaac75572fb8f6affected · git
    • before 5.15not affected · semver
    • 5.15.127 and later · up to and including 5.15.*not affected · semver
    • 6.1.46 and later · up to and including 6.1.*not affected · semver
    • 6.4.11 and later · up to and including 6.4.*not affected · semver
    • 6.5 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.11-16.4.11-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.52.16.4.0-150600.8.52.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.70.1.150600.12.30.26.4.0-150600.23.70.1.150600.12.30.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.52.16.4.0-150600.10.52.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.52.16.4.0-150600.10.52.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.52.16.4.0-150600.8.52.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.52.16.4.0-150600.10.52.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.52.16.4.0-150600.8.52.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.52.16.4.0-150600.10.52.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.70.16.4.0-150600.23.70.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_15before 1-150600.13.3.21-150600.13.3.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_15before 1-150600.1.3.11-150600.1.3.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_4before 1-150700.15.3.21-150700.15.3.2

+40

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-2023-3866Aug 16, 2025 · ksmbd: validate session id and tree id in the compound request
    26Monitor
  • ← EarlierCVE-2023-3867Aug 16, 2025 · ksmbd: fix out of bounds read in smb2_sess_setup
    30Monitor
  • Later →CVE-2023-4515Aug 16, 2025 · ksmbd: validate command request size
    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 Linux4bf629262f9118ee91b1c3a518ebf2b3bcb22180Vendor (CNA)
Linux Linux79ed288cef201f1f212dfb934bcaac75572fb8f6Vendor (CNA)
Linux Linuxaeb974907642be095e38ecb1a400ca583958b2b0Vendor (CNA)
Linux Linuxf339d76a3a972601d0738b881b099d49ebbdc3a2Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.70.1.150600.12.30.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.70.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-rt6.4.0-150600.10.52.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-rt_debug6.4.0-150600.10.52.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-rt6.4.0-150600.10.52.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-rt6.4.0-150600.10.52.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.70.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-64kb6.4.0-150700.53.16.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-150600.23.70.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default6.4.0-150700.53.16.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.70.1.150600.12.30.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150700.53.16.1.150700.17.11.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.16.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6-RT_Update_151-150600.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-obs-build6.4.0-150700.53.16.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-rt6.4.0-150600.10.52.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-rt_debug6.4.0-150600.10.52.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-source6.4.0-150700.53.16.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-source-rt6.4.0-150600.10.52.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)

+2

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
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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records