# CVE-2023-32255: Kernel: memory leak via ksmbd session setup request with unknown ntlmssp message type

Status: published. Published: 2025-08-02. Updated: 2026-11-09.

A flaw was found in the Linux kernel's ksmbd component. A memory leak can occur if a client sends a session setup request with an unknown NTLMSSP message type,  potentially leading to resource exhaustion.

## Remediation

No remediation reported in collected sources

## Affected products and versions

-  /  (linux): ≥ 0; < 5.15.111 (affected, semvar); ≥ 6.0.0; < 6.0.* (affected, semvar); ≥ 6.1.0; < 6.1.28 (affected, semvar); ≥ 6.2.0; < 6.2.15 (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: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.55% as of 2026-11-08; percentile 46.43%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-772

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2023-32255 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2385884 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d7cb549c2ca20e1f07593f15e936fd54b763028 (CNA: redhat)

- https://www.zerodayinitiative.com/advisories/ZDI-23-703/ (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2023-32255; retrieved 2026-11-09; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-32255; retrieved 2026-11-09; source updated Not reported

Revision: bfc2844b28c3045317e6cfc45b38e88dbb7aaf7740e248f9f160fff381294423

Canonical: https://y2.dev/cve/CVE-2023-32255

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