CVE-2026-98323Network attack vector

Kernel memory corruption via fragmented header copy

Published Oct 6, 2026 · Updated Oct 6, 2026

An out-of-bounds write in the Linux kernel Soft-iWARP receiver allows remote attackers to corrupt receive state through fragmented DDP/RDMAP headers. In siw_get_hdr(), a later TCP callback limits its copy by the extended header length minus the minimum header, rather than by the bytes still missing; the copy overwrites fpdu_part_rcvd, which can then become a negative offset for another write. The path requires a Soft-iWARP connection and a header split across TCP callbacks; the published patch does not establish code execution or a specific service-failure outcome.

CVSS severityUnavailable
Unscored
EPSS probability0.56%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Linux kernel Soft-iWARP receiver allows remote attackers to corrupt receive state through fragmented DDP/RDMAP headers. In siw_get_hdr(), a later TCP callback limits its copy by the extended header length minus the minimum header, rather than by the bytes still missing; the copy overwrites fpdu_part_rcvd, which can then become a negative offset for another write. The path requires a Soft-iWARP connection and a header split across TCP callbacks; the published patch does not establish code execution or a specific service-failure outcome.

The record

CVE
CVE-2026-98323
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=0c14f795a9eab9344230f9933798b8ee496f497d
  2. Affected versionversion=308cd50f174c95a507527037f4de1a0396aa4325 <af9f5b474a260ad23ffb9793d716a5e3bbce3b48
  3. Affected versionversion=5.10.150 <5.10.271
  4. Affected versionversion=5.15.75 <5.15.222
  5. Affected versionversion=5.19.17 <5.20
  6. Affected versionversion=5.4.220 <5.5
  7. Affected versionversion=6.0.3 <6.1
  8. Affected versionversion=6.1
  9. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <262dcd809723723ed8a4e05437ec7e9c21a8f17e
  10. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <8628f8ebf41669302513fb3f0bf0eba38b226742
  11. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <9ff797e516dbc1ecb73701ec4c24055712d44411
  12. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <b72dcfb9bf1f0f0147cda03dc59e4002a315067f
  13. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
  14. Affected versionversion=754209850df8367c954ac1de7671c7430b1f342c <eb4d7a946970469b3ab0c762432bf161d5b0836c
  15. Affected versionversion=7fada7c6962219b6fc4ff4e62e46a936af110dd9
  16. Affected versionversion=e09caa38e10bcf027100cc22b0e3cc745a39ef0a
  17. Affected versionversion=e3917c85f41ef1df64e27dc0e46ab0d803c5e73e <2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0c14f795a9eab9344230f9933798b8ee496f497d; version=308cd50f174c95a507527037f4de1a0396aa4325 <af9f5b474a260ad23ffb9793d716a5e3bbce3b48; version=5.10.150 <5.10.271; version=5.15.75 <5.15.222; version=5.19.17 <5.20; version=5.4.220 <5.5; version=6.0.3 <6.1; version=6.1; version=754209850df8367c954ac1de7671c7430b1f342c <262dcd809723723ed8a4e05437ec7e9c21a8f17e; version=754209850df8367c954ac1de7671c7430b1f342c <8628f8ebf41669302513fb3f0bf0eba38b226742; version=754209850df8367c954ac1de7671c7430b1f342c <9ff797e516dbc1ecb73701ec4c24055712d44411; version=754209850df8367c954ac1de7671c7430b1f342c <b72dcfb9bf1f0f0147cda03dc59e4002a315067f; version=754209850df8367c954ac1de7671c7430b1f342c <e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d; version=754209850df8367c954ac1de7671c7430b1f342c <eb4d7a946970469b3ab0c762432bf161d5b0836c; version=7fada7c6962219b6fc4ff4e62e46a936af110dd9; version=e09caa38e10bcf027100cc22b0e3cc745a39ef0a; version=e3917c85f41ef1df64e27dc0e46ab0d803c5e73e <2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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