CVE-2023-53449

Service interruption via s390 DASD request leak

Published Oct 1, 2025 · Updated Oct 1, 2025

Memory leak in the Linux kernel allows local users to exhaust kernel memory via failed s390 DASD initialization requests. In dasd_eckd_init(), allocation of dasd_reserve_req precedes dasd_vol_info_req, but the latter's allocation-failure path returns without freeing the first request. Reachability is limited to local users on s390 systems during DASD initialization; repeated error-path execution consumes kernel memory and causes availability loss.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel allows local users to exhaust kernel memory via failed s390 DASD initialization requests. In dasd_eckd_init(), allocation of dasd_reserve_req precedes dasd_vol_info_req, but the latter's allocation-failure path returns without freeing the first request. Reachability is limited to local users on s390 systems during DASD initialization; repeated error-path execution consumes kernel memory and causes availability loss.

The record

CVE
CVE-2023-53449
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=5.3
  2. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <460e9bed82e49db1b823dcb4e421783854d86c40
  3. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <544a552be0869231799784279d52704c4d314d33
  4. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <a50e28d433acf22258f9f34831057387f04ef074
  5. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <aede5230d154b6b237985ec9df7ebbd1dce96810
  6. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <ee986d80acdef710a886be404308188ea11000c8
  7. Affected versionversion=9e12e54c7a8f616190beffb0f7ce778a86aec175 <ef3a7ffc0a6f833578bc8d1dcb79d0633c7e4ec3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <460e9bed82e49db1b823dcb4e421783854d86c40; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <544a552be0869231799784279d52704c4d314d33; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <a50e28d433acf22258f9f34831057387f04ef074; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <aede5230d154b6b237985ec9df7ebbd1dce96810; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <ee986d80acdef710a886be404308188ea11000c8; version=9e12e54c7a8f616190beffb0f7ce778a86aec175 <ef3a7ffc0a6f833578bc8d1dcb79d0633c7e4ec3

Published CVSS scores

5.5NVDCVSS: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.

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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-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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