CVE-2023-4515

Linux Kernel vulnerability

9.1 CRITICALEPSS 0.30%

Published16 Aug 2025

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate command request size In commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), except for SMB2_OPLOCK_BREAK_HE command, the request size of other commands is not checked, it's not expected. Fix it by add check for request size of other commands.

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≥ 5.15.121 < 5.15.127 · ≥ 6.1.36 < 6.1.46 · ≥ 6.3.10 < 6.4 · ≥ 6.4.1 < 6.4.11

Remediation

Fixed in

Linux Kernel≥ 5.15.127

Patch & vendor advisories

References

Frequently asked

Is CVE-2023-4515 being actively exploited?

CVE-2023-4515 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.30%.

How severe is CVE-2023-4515?

CVE-2023-4515 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2023-4515?

Affected products include Linux Kernel.

How do I fix CVE-2023-4515?

Upgrade affected software to a fixed version, for example Linux Kernel 5.15.127 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-4515 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.