Vulnary
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Critical· 9.8official fix available

CVE-2023-53794

A critical use-after-free vulnerability in the Linux kernel's CIFS implementation could allow attackers to exploit session state during reconnection. The fix prevents premature collection of exiting sessions, resolving the issue.

publishedDec 9, 2025
last modifiedAug 4, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
37th 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 3, 2026

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

01

Who is affected

Systems using the Linux kernel with the vulnerable CIFS implementation

02

Real-world impact

Attackers could potentially exploit this during network reconnection attempts, leading to system instability or privilege escalation.

03

Why this severity

CVSS 9.8 (Critical): High confidence in exploitability and severe impact on confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade the Linux kernel to a version that includes the patch for CVE-2023-53794.
  2. 02Verify the kernel update is applied and the system is running the updated kernel.

NVD-referenced vulnerability advisory

05

Timeline

  1. Dec 9, 2025 · Dec 9, 2025
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Aug 4, 2026 · 1d ago
    Advisory updated
    The NVD record was last revised.
  3. Aug 4, 2026 · 1d 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 →