CVE-2023-1195

Local system crash via stale CIFS hostname

Published May 18, 2023 · Updated Mar 18, 2025

Use-after-free in the CIFS client in Linux Kernel before 6.1-rc3 allows local users to crash the system during a failed mount. cifs_put_tcp_session frees server->hostname without nulling it, so the cifsd reconnect thread later dereferences the stale pointer in reconn_set_ipaddr_from_hostname. Reaching the fault requires local access that can initiate a CIFS mount and a failed connection; the grounded consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.21%
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 the CIFS client in Linux Kernel before 6.1-rc3 allows local users to crash the system during a failed mount. cifs_put_tcp_session frees server->hostname without nulling it, so the cifsd reconnect thread later dereferences the stale pointer in reconn_set_ipaddr_from_hostname. Reaching the fault requires local access that can initiate a CIFS mount and a failed connection; the grounded consequence is a system crash.

The record

CVE
CVE-2023-1195
Published
May 18, 2023
Updated
Mar 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=prior to kernel 6.1 rc3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=prior to kernel 6.1 rc3

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

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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