How severe is CVE-2023-32256?

CVE-2023-32256 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2023-32256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-32256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-32256 have an EU (EUVD) identifier?

Yes. CVE-2023-32256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-36513.

When was CVE-2023-32256 published?

CVE-2023-32256 was published on 2025-08-01 and last updated on 2026-06-29.

CVE-2023-32256

CVE-2023-32256 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-421.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-36513
Weakness: CWE-421
Published: 2025-08-01
Last modified: 2026-06-29

Description

A flaw was found in the Linux kernel's ksmbd component. A race condition between smb2 close operation and logoff in multichannel connections could result in a use-after-free issue.

Frequently asked questions

What is CVE-2023-32256?: A flaw was found in the Linux kernel's ksmbd component. A race condition between smb2 close operation and logoff in multichannel connections could result in a use-after-free issue.
How severe is CVE-2023-32256?: CVE-2023-32256 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2023-32256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-32256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-32256 have an EU (EUVD) identifier?: Yes. CVE-2023-32256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-36513.
When was CVE-2023-32256 published?: CVE-2023-32256 was published on 2025-08-01 and last updated on 2026-06-29.

References

Other CWE-421 vulnerabilities

CVE-2023-43687 — Medium (CVSS 6.5): An issue was discovered in Malwarebytes before 4.6.14.326 and before 5.1.5.116 (and Nebula 2020-10-21 and later). There…
CVE-2023-40536 — Medium (CVSS 4.3): Race condition for some some Intel(R) PROSet/Wireless WiFi software for Windows before version 23.20 may allow an…

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