CVE-2023-52440
A critical flaw in the Linux kernel's SMB server (ksmbd) can cause a memory overflow when processing certain authentication blobs. This could let an attacker crash the system or potentially execute code. The issue has been fixed in recent kernel releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel, any distribution using the ksmbd SMB server component, especially versions before the patch.
Real-world impact
An attacker could crash the system or potentially run arbitrary code by sending a crafted SMB authentication blob.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable over the network, requires no user interaction, and can lead to complete compromise of confidentiality, integrity, and availability.
What to do about it
- 01Upgrade to a Linux kernel version that includes the ksmbd patch.
NVD-referenced vendor advisory
Timeline
- Feb 21, 2024 · Feb 21, 2024PublishedDisclosed and added to the National Vulnerability Database.
- Aug 4, 2026 · 2d agoAdvisory updatedThe NVD record was last revised.
- Aug 6, 2026 · 8h agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.