CVE-2026-52989Network attack vector

Remote kernel memory corruption via uninitialized iterator

Published Jun 24, 2026 · Updated Jun 24, 2026

Use of an uninitialized iterator in affected Linux Kernel versions allows remote attackers to corrupt kernel memory via crafted NVMe/TCP PDUs. nvmet_tcp_build_pdu_iovec returns without initializing cmd->recv_msg.msg_iter, while nvmet_tcp_handle_h2c_data_pdu still sets the receive state to data. Exposure requires an enabled NVMe/TCP target; subsequent socket reads can overwrite memory or crash the kernel.

CVSS severity9.8
Critical
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized iterator in affected Linux Kernel versions allows remote attackers to corrupt kernel memory via crafted NVMe/TCP PDUs. nvmet_tcp_build_pdu_iovec returns without initializing cmd->recv_msg.msg_iter, while nvmet_tcp_handle_h2c_data_pdu still sets the receive state to data. Exposure requires an enabled NVMe/TCP target; subsequent socket reads can overwrite memory or crash the kernel.

The record

CVE
CVE-2026-52989
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, CWE-390, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record 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=043b4307a99f902697349128fde93b2ddde4686c
  2. Affected versionversion=1385be357e8acd09b36e026567f3a9d5c61139de <3df42a854686fa06484e37ac1a3931c8e3e3453c
  3. Affected versionversion=19672ae68d52ff75347ebe2420dde1b07adca09f <f9204a2b78dd18374d3bcf9bf93d9021ce22de1b
  4. Affected versionversion=42afe8ed8ad2de9c19457156244ef3e1eca94b5d
  5. Affected versionversion=5.10.250 <5.11
  6. Affected versionversion=5.15.200 <5.16
  7. Affected versionversion=52a0a98549344ca20ad81a4176d68d28e3c05a5c <046fa5c72d15cd8e2d592e275697ea399d8f76b0
  8. Affected versionversion=52a0a98549344ca20ad81a4176d68d28e3c05a5c <ea8e356acb165cb1fd75537a52e1f66e5e76c538
  9. Affected versionversion=6.1.163 <6.1.175
  10. Affected versionversion=6.12.70 <6.12.91
  11. Affected versionversion=6.18.10 <6.18.33
  12. Affected versionversion=6.19
  13. Affected versionversion=6.6.124 <6.6.141
  14. Affected versionversion=ab200d71553bdcf4de554a5985b05b2dd606bc57 <c2a11441538bdbbc5aa003f190995eba93a89b88
  15. Affected versionversion=dca1a6ba0da9f472ef040525fab10fd9956db59f <d7c8f95f599b3b38a717d2e771c3f8c174f657c3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=043b4307a99f902697349128fde93b2ddde4686c; version=1385be357e8acd09b36e026567f3a9d5c61139de <3df42a854686fa06484e37ac1a3931c8e3e3453c; version=19672ae68d52ff75347ebe2420dde1b07adca09f <f9204a2b78dd18374d3bcf9bf93d9021ce22de1b; version=42afe8ed8ad2de9c19457156244ef3e1eca94b5d; version=5.10.250 <5.11; version=5.15.200 <5.16; version=52a0a98549344ca20ad81a4176d68d28e3c05a5c <046fa5c72d15cd8e2d592e275697ea399d8f76b0; version=52a0a98549344ca20ad81a4176d68d28e3c05a5c <ea8e356acb165cb1fd75537a52e1f66e5e76c538; version=6.1.163 <6.1.175; version=6.12.70 <6.12.91; version=6.18.10 <6.18.33; version=6.19; version=6.6.124 <6.6.141; version=ab200d71553bdcf4de554a5985b05b2dd606bc57 <c2a11441538bdbbc5aa003f190995eba93a89b88; version=dca1a6ba0da9f472ef040525fab10fd9956db59f <d7c8f95f599b3b38a717d2e771c3f8c174f657c3

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.1redhat-SADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
CWE-390Detection of Error Condition Without Action
T1210Exploitation of Remote Services

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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