Vulnary
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Critical· 9.8official fix available

CVE-2021-47328

A flaw in the Linux kernel's iSCSI implementation allows for a 'use-after-free' error during connection resets. This occurs when a connection is closed while other system threads are still trying to access it.

publishedMay 21, 2024
last modifiedAug 4, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
52th 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

Users running the Linux kernel that utilize iSCSI for storage connectivity.

02

Real-world impact

An attacker could potentially cause a system crash or execute arbitrary code by triggering a race condition during an iSCSI connection reset.

03

Why this severity

This vulnerability is rated critical because it can be exploited remotely without authentication or user interaction, potentially leading to a complete system compromise.

04

What to do about it

official fix available
recommended steps
  1. 01Update the Linux kernel to a version containing the fix for the scsi: iscsi connection reset vulnerability.

NVD-referenced vendor advisory

05

Timeline

  1. May 21, 2024 · May 21, 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 · 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 →