Vulnary
← back to the feed
Critical· 9.8official fix available

CVE-2023-52480

A race condition in the Linux kernel’s SMB daemon (ksmbd) can lead to a use‑after‑free bug. The issue has been fixed by adding a read‑write semaphore to synchronize session lookup and expiration. Updating the kernel resolves the vulnerability.

publishedFeb 29, 2024
last modifiedAug 4, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
39th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Sep 4, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel, including all distributions that ship kernel 6.6 and earlier versions.

02

Real-world impact

An attacker could exploit the race condition to trigger a use‑after‑free, potentially allowing arbitrary code execution or causing a denial of service on the affected system.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw can compromise confidentiality, integrity, and availability with no authentication or user interaction required, making it a critical risk.

04

What to do about it

official fix available
recommended steps
  1. 01Check your current Linux kernel version.
  2. 02Upgrade to a kernel version that includes the ksmbd session lookup race condition fix.

NVD-referenced vendor advisory

05

Timeline

  1. Feb 29, 2024 · Feb 29, 2024
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Aug 4, 2026 · 2d ago
    Advisory updated
    The NVD record was last revised.
  3. Aug 5, 2026 · 19h ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
CVE-2023-52480: A race condition in the Linux kernel’s SMB daemon (ksmbd) can lead to · Vulnary