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CVE-2026-98556VulnerabilityPublished Updated

Microsoft · gve: DQO: reject TSO packets with an out of range MSS

Affects MicrosoftSource GCVE Database

0
Authoritative record:CVE-2026-98556· Medium

Not known to be exploited · fixed in c517e8755960c8c6335ebf7dae6c95c43e5fb085 : update Microsoft when convenient.

Data as of 28 Oct 2026, 09:29 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Patch
Available – fixed in c517e8755960c8c6335ebf7dae6c95c43e5fb085, 296c83b5ccc808c080865eb20fd7a477b0355bb7, 2dc3ae3942e151fef254b7bbb65c832192ad2069

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Linux to c517e8755960c8c6335ebf7dae6c95c43e5fb085, 296c83b5ccc808c080865eb20fd7a477b0355bb7 or 2dc3ae3942e151fef254b7bbb65c832192ad2069.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ a57e5de476be0b4b7f42beb6a21c19ad9c577aa3, < c517e8755960c8c6335ebf7dae6c95c43e5fb085
Fixed in
  • c517e8755960c8c6335ebf7dae6c95c43e5fb085
LinuxLinuxAffected
  • ≥ a57e5de476be0b4b7f42beb6a21c19ad9c577aa3, < 296c83b5ccc808c080865eb20fd7a477b0355bb7
Fixed in
  • 296c83b5ccc808c080865eb20fd7a477b0355bb7
LinuxLinuxAffected
  • ≥ a57e5de476be0b4b7f42beb6a21c19ad9c577aa3, < 2dc3ae3942e151fef254b7bbb65c832192ad2069
Fixed in
  • 2dc3ae3942e151fef254b7bbb65c832192ad2069
LinuxLinuxAffected
  • =5.14
Fixed in–

Description

This vulnerability involves the rejection of TCP Segmentation Offload (TSO) packets with an out-of-range Maximum Segment Size (MSS) in Microsoft software versions 3.0 and 4.0. The advisory references the Microsoft Support Lifecycle for software support details but does not provide specific technical or impact details.

References

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