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NVD / CVE Program· CNA Linux

CVE-2023-52441: ksmbd: fix out of bounds in init_smb2_rsp_hdr()

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: 0.67% (FIRST EPSS); higher than 52.6% of all records.
  • 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 330d900620dfc9893011d725b3620cd2ee0bc2bc, 5.15.145, 536bb492d39bb6c080c92f31e8a55fe9934f452b.

Low priority for now. Upgrade to Linux Linux 330d900620dfc9893011d725b3620cd2ee0bc2bc, 5.15.145, 536bb492d39bb6c080c92f31e8a55fe9934f452b 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 out of bounds in init_smb2_rsp_hdr() If client send smb2 negotiate request and then send smb1 negotiate request, init_smb2_rsp_hdr is called for smb1 negotiate request since need_neg is set to false. This patch ignore smb1 packets after ->need_neg is set to false.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Feb 21, 2024
Updated
Aug 15, 2026
EPSS
0.6% · 52th percentile

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 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
9.1
1.3 point gap

CVSS:3.1/AV:N/AC:L/PR:N/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.

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-2023-52441

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 kernel5.15.0 and later · before 5.15.145
  • linux linux kernel5.16.0 and later · before 6.1.53
  • linux linux kernel6.2.0 and later · before 6.4.16

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

    • cc32cd98a0aee4cc3eb611cbce11795b1aaa738a, 6.3affected
    • 51a8534c0f35c0401e45f1055f914729cad98bf9 and later · before 5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40baffected · git
    • 0b3ec5671ac06829ccebdaeec05acedfec327f42 and later · before 330d900620dfc9893011d725b3620cd2ee0bc2bcaffected · git
    • 39b291b86b5988bf8753c3874d5c773399d09b96 and later · before aa669ef229ae8dd779da9caa24e254964545895faffected · git
    • 39b291b86b5988bf8753c3874d5c773399d09b96 and later · before 536bb492d39bb6c080c92f31e8a55fe9934f452baffected · git
    • 5.15.105 and later · before 5.15.145affected · semver
    • 6.1.22 and later · before 6.1.53affected · semver
    • 6.2.9 and later · before 6.3affected · semver
    • before 6.3not affected · semver
    • 5.15.145 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.55-16.1.55-1
Debian:13linuxbefore 6.5.3-16.5.3-1

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-2023-52439Feb 20, 2024 · uio: Fix use-after-free in uio_open
    31Monitor
  • ← EarlierCVE-2023-52440Feb 21, 2024 · ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
    38Monitor
  • Later →CVE-2023-52442Feb 21, 2024 · ksmbd: validate session id and tree id in compound request
    31Monitor

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 Linux330d900620dfc9893011d725b3620cd2ee0bc2bcVendor (CNA)
Linux Linux5.15.145Vendor (CNA)
Linux Linux536bb492d39bb6c080c92f31e8a55fe9934f452bVendor (CNA)
Linux Linux5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40bVendor (CNA)
Linux Linux6.1.53Vendor (CNA)
Linux Linux6.3Vendor (CNA)
Linux Linuxaa669ef229ae8dd779da9caa24e254964545895fVendor (CNA)
debian:linux6.1.55-1 · 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-2023-524400 days apartksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
    38Monitor
  • CVE-2021-4734890 days apartdrm/amd/display: Avoid HDCP over-read and corruption
    36Monitor
  • CVE-2022-3640488 days apartLinux Kernel Bluetooth l2cap_core.c l2cap_conn_del use after free
    35Monitor
  • CVE-2023-524341 days apartsmb: client: fix potential OOBs in smb2_parse_contexts()
    32Monitor
  • CVE-2024-265881 days apartLoongArch: BPF: Prevent out-of-bounds memory access
    31Monitor
  • CVE-2024-265891 days apartbpf: Reject variable offset alu on PTR_TO_FLOW_KEYS
    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
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)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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

ATT&CK techniques

—

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