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CVE-2023-3867

Linux Kernel out-of-bounds read

9.1 CRITICALEPSS 5.37%
  1. Published16 Aug 2025

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().

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Linux Kernel≥ 5.15 < 5.15.145 · ≥ 5.16 < 6.1.40 · ≥ 6.2 < 6.4.5

Remediation

Fixed in
Linux Kernel≥ 5.15.145

References

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Frequently asked

Is CVE-2023-3867 being actively exploited?

CVE-2023-3867 is not in the CISA KEV catalog. Its EPSS exploit probability is 5.37%.

How severe is CVE-2023-3867?

CVE-2023-3867 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 5.37% probability of exploitation.

Which products are affected by CVE-2023-3867?

Affected products include Linux Kernel.

How do I fix CVE-2023-3867?

Upgrade affected software to a fixed version, for example Linux Kernel 5.15.145 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-3867 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.