No exploitation reportedFix available

CVE-2023-3867

Q: Is CVE-2023-3867 actively exploited?

Active exploitation of CVE-2023-3867 has not been confirmed. Its EPSS score was 6.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-3867?

CVE-2023-3867 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

No exploitation reported by the sources we read.

Published2025-08-16
Fixed in6.4.5 · 6.1.40 · 5.15.145
WeaknessCWE-125

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

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds read in smb2_sess_setup ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().

Timeline

dates in UTC

2025-08-1614:15CVE 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-2023-3867?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-3867?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

Branch	Affected	Fixed in	Source
6.x	≥ 6.2, < 6.4.5	6.4.5	NVD
6.1	≥ 5.16, < 6.1.40	6.1.40	NVD
5.15	≥ 5.15, < 5.15.145	5.15.145	NVD

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

Fix

Update Linux linux kernel to 6.4.5 · 6.1.40 · 5.15.145

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.19.1read 2026-10-23
NVDCVSS 3.17.1read 2026-10-23
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score6.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Published: 2025-08-16
Last Modified: 2026-08-15
NVD status: Modified

Frequently asked questions

What is CVE-2023-3867?

Is CVE-2023-3867 actively exploited?

Active exploitation of CVE-2023-3867 has not been confirmed. Its EPSS score was 6.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-3867?

CVE-2023-3867 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

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