CVE-2023-1193Network attack vector

Authenticated system crash via freed asynchronous work

Published Nov 1, 2023 · Updated Feb 27, 2025

Use-after-free in KSMBD in Fedora Linux allows remote authenticated users to crash the system through an asynchronous SMB request. During deferred-lock handling, response-header initialization marks asynchronous work as synchronous without checking its list state, so completed work is freed while its linked-list entry remains reachable. An authenticated network client can reach the stale work through KSMBD and cause an availability-only kernel crash; no data read or write is reported.

CVSS severity6.5
Medium
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in KSMBD in Fedora Linux allows remote authenticated users to crash the system through an asynchronous SMB request. During deferred-lock handling, response-header initialization marks asynchronous work as synchronous without checking its list state, so completed work is freed while its linked-list entry remains reachable. An authenticated network client can reach the stale work through KSMBD and cause an availability-only kernel crash; no data read or write is reported.

The record

CVE
CVE-2023-1193
Published
Nov 1, 2023
Updated
Feb 27, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-416, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fedora Project · Fedora LinuxAffected versions are unavailable in this record.

Published CVSS scores

6.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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