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CVE-2026-98541VulnerabilityPublished Updated

Microsoft · fou: reject omitted FOU_ATTR_IPPROTO on FOU_ENCAP_DIRECT

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98541· Medium

Not known to be exploited · fixed in fd20220f86947d66d4dba2d76f13a28dbd86ef30 : update Microsoft when convenient.

Data as of 2 Nov 2026, 08:46 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Patch
Available – fixed in fd20220f86947d66d4dba2d76f13a28dbd86ef30, d22609f3d13fc5baacd92c222731b03c593401db, b1229b210ef5a39c58be665e6798203751411842 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 1 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < fd20220f86947d66d4dba2d76f13a28dbd86ef30
Fixed in
  • fd20220f86947d66d4dba2d76f13a28dbd86ef30
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < d22609f3d13fc5baacd92c222731b03c593401db
Fixed in
  • d22609f3d13fc5baacd92c222731b03c593401db
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b1229b210ef5a39c58be665e6798203751411842
Fixed in
  • b1229b210ef5a39c58be665e6798203751411842
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221
Fixed in
  • 520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 46b1ffb7e169c7e401dd890b29e55dbc261f8f01
Fixed in
  • 46b1ffb7e169c7e401dd890b29e55dbc261f8f01
LinuxLinuxAffected
  • ≥ 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 8b43f40798bb2758489fbbcae7e841ad4443c213
Fixed in
  • 8b43f40798bb2758489fbbcae7e841ad4443c213

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

CVE-2026-98541 is a published vulnerability related to the handling of the FOU_ATTR_IPPROTO attribute in the FOU_ENCAP_DIRECT context within Microsoft software versions 3.0 and 4.0. The provided information does not include details on the nature of the flaw, its impact, or exploitation methods.

References

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