CVE-2023-3867
A critical bug in the Linux kernel’s SMB daemon (ksmbd) allows an attacker to read memory beyond intended bounds during a session setup. The flaw can be triggered without authentication or user interaction and can compromise system confidentiality and availability.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel (ksmbd component) – any distribution using the affected kernel version.
Real-world impact
An attacker could read arbitrary memory contents, potentially exposing sensitive data or causing a denial‑of‑service by crashing the kernel.
Why this severity
The CVSS score of 9.1 reflects that the vulnerability is exploitable over the network, requires no privileges or user interaction, and can lead to complete loss of confidentiality and availability.
What to do about it
- 01Upgrade the Linux kernel to a version that includes the ksmbd patch for CVE-2023-3867.
NVD-referenced vendor advisory
Timeline
- Aug 16, 2025 · Aug 16, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Aug 4, 2026 · 1d agoAdvisory updatedThe NVD record was last revised.
- Aug 4, 2026 · 1d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.