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No exploitation reportedFix available

CVE-2023-32257

No exploitation reported by the sources we read.

  • Published2023-07-24
  • Fixed in6.3.2 · 6.2.16 · 6.1.29 · 5.15.145
  • WeaknessCWE-362 · CWE-667

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Timeline

dates in UTC
  1. 2023-07-2416:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-32257?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-32257?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
6.3≥ 6.3, < 6.3.26.3.2
6.2≥ 6.2, < 6.2.166.2.16
6.1≥ 5.16, < 6.1.296.1.29
5.15≥ 5.15, < 5.15.1455.15.145
Netapp h300s
BranchAffectedFixed in
—all versionsno fix published
Netapp h410s
BranchAffectedFixed in
—all versionsno fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Linux linux kernel to 6.3.2 · 6.2.16 · 6.1.29 · 5.15.145

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-07-29
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.18.1read 2026-10-23
  • NVDCVSS 3.18.1read 2026-10-23
  • CNAweakness (CWE)CWE-362read 2026-10-23
  • NVDweakness (CWE)CWE-667read 2026-10-23
  • FIRST EPSSEPSS score2.4 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-07-24
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-32257?

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Is CVE-2023-32257 actively exploited?

Active exploitation of CVE-2023-32257 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-32257?

CVE-2023-32257 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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