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CVE-2023-52440

Linux Kernel buffer overflow

9.8 CRITICALEPSS 21.9%
  1. Published21 Feb 2024

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.

CVSS 3.1 breakdown

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

Affected products

Linux Kernel≥ 5.17.0 < 6.1.52 · ≥ 6.2.0 < 6.4.15 · ≥ 6.5.0 < 6.5.2

Remediation

Fixed in
Linux Kernel≥ 6.1.52

References

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Frequently asked

Is CVE-2023-52440 being actively exploited?

CVE-2023-52440 is not in the CISA KEV catalog. Its EPSS exploit probability is 21.9%.

How severe is CVE-2023-52440?

CVE-2023-52440 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 21.9% probability of exploitation.

Which products are affected by CVE-2023-52440?

Affected products include Linux Kernel.

How do I fix CVE-2023-52440?

Upgrade affected software to a fixed version, for example Linux Kernel 6.1.52 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-52440 against the real software inventory on every managed device, every day. 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.