CVE-2023-54219Network attack vector

Remote service exhaustion via leaked iSER connections

Published Dec 30, 2025 · Updated Dec 30, 2025

Resource leak in the Linux kernel iSER target allows remote attackers to exhaust server memory through repeated connection teardown. The pre-login teardown path omits kref_put, retaining each isert_conn, queue pair, completion-queue reservation, protection-domain reference, and DMA buffer. An unauthenticated RDMA initiator can repeatedly connect and abort until kernel or HCA resources fail; the flaw does not disclose or modify data.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel iSER target allows remote attackers to exhaust server memory through repeated connection teardown. The pre-login teardown path omits kref_put, retaining each isert_conn, queue pair, completion-queue reservation, protection-domain reference, and DMA buffer. An unauthenticated RDMA initiator can repeatedly connect and abort until kernel or HCA resources fail; the flaw does not disclose or modify data.

The record

CVE
CVE-2023-54219
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=18512de74454fba6ebd06e579f4f1a3200a9e50d <1bb42aca7a9611c1991a790834e2a65f3345c5e8
  2. Affected versionversion=277fbf63b34a377c800d25c7cfd8231ba19cffe2 <3f39698e7e842abc9bd2bd97bf5eeda4543db758
  3. Affected versionversion=2f884e6df67347301e51e6be5ad4b61cc8989114
  4. Affected versionversion=3c97f2c9ec29ce2f61772f6120aabc852f57132e <aa950b9835f2d004b071fd220459edd3cd0a3603
  5. Affected versionversion=6.4
  6. Affected versionversion=6718478c18a4f4923d86b81dc7e51363e1a60b03 <9b6296861a5a9d58aacd72c249a68b073c78bfb4
  7. Affected versionversion=699826f4e30ab76a62c238c86fbef7e826639c8d <4082b59705ee9e3912eaa9e15abda8e76039b681
  8. Affected versionversion=699826f4e30ab76a62c238c86fbef7e826639c8d <a3189341e2f609d48f730b18c8bbbf6783233477
  9. Affected versionversion=699826f4e30ab76a62c238c86fbef7e826639c8d <dfe261107c080709459c32695847eec96238852b
  10. Affected versionversion=ccf5a1b28e2b73952e8d23126fa1abc6ff99de55 <77e90bd53019d4d4c9e25552b5efb06dfd8c3c82
  11. Affected versionversion=fb4043077b51e577ecccb3233ecfb8764fcea393 <a277b736309f923d9baff0ef166d694d348a5b96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=18512de74454fba6ebd06e579f4f1a3200a9e50d <1bb42aca7a9611c1991a790834e2a65f3345c5e8; version=277fbf63b34a377c800d25c7cfd8231ba19cffe2 <3f39698e7e842abc9bd2bd97bf5eeda4543db758; version=2f884e6df67347301e51e6be5ad4b61cc8989114; version=3c97f2c9ec29ce2f61772f6120aabc852f57132e <aa950b9835f2d004b071fd220459edd3cd0a3603; version=6.4; version=6718478c18a4f4923d86b81dc7e51363e1a60b03 <9b6296861a5a9d58aacd72c249a68b073c78bfb4; version=699826f4e30ab76a62c238c86fbef7e826639c8d <4082b59705ee9e3912eaa9e15abda8e76039b681; version=699826f4e30ab76a62c238c86fbef7e826639c8d <a3189341e2f609d48f730b18c8bbbf6783233477; version=699826f4e30ab76a62c238c86fbef7e826639c8d <dfe261107c080709459c32695847eec96238852b; version=ccf5a1b28e2b73952e8d23126fa1abc6ff99de55 <77e90bd53019d4d4c9e25552b5efb06dfd8c3c82; version=fb4043077b51e577ecccb3233ecfb8764fcea393 <a277b736309f923d9baff0ef166d694d348a5b96

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.7SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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