# CVE-2023-32256: Kernel: ksmbd race issue from smb2 close and logoff with multichannel

Status: published. Published: 2025-08-01. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

-  /  (linux): ≥ 0; < 5.15.145 (affected, semvar); ≥ 6.0.0; < 6.0.* (affected, semvar); ≥ 6.1.0; < 6.1.29 (affected, semvar); ≥ 6.2.0; < 6.2.16 (affected, semvar); ≥ 6.3.0; < 6.3.2 (affected, semvar). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (kernel): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (kernel): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (kernel): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (kernel-rt): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (kernel): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (kernel-rt): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (kernel): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (kernel-rt): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.61% as of 2026-11-06; percentile 49.63%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-421

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2023-32256 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2385885 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abcc506a9a71976a8b4c9bf3ee6efd13229c1e19 (CNA: redhat)

- https://www.zerodayinitiative.com/advisories/ZDI-23-704/ (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2023-32256; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-32256; retrieved 2026-11-06; source updated Not reported

Revision: 3ccc4654d30a8dd7d0359491de4c8b07643abcc4ac926bf7168ef34056acd579

Canonical: https://y2.dev/cve/CVE-2023-32256

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