Skip to main content
CVE-2026-98621VulnerabilityPublished Updated

Microsoft · net: gue: reject invalid REMCSUM offsets

Affects MicrosoftSource GCVE Database

0
Compare
Authoritative record:CVE-2026-98621· High

Not known to be exploited · fixed in c20f755338ca234e523dfc943719f194dfc1f903 : patch Microsoft soon.

Data as of 2 Nov 2026, 10:58 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in c20f755338ca234e523dfc943719f194dfc1f903, 2566866fc30965d915d0b52b5c3323b362619f0e, 97f907203321eee2cc9132d5c9eb47698fb41d35 +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 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < c20f755338ca234e523dfc943719f194dfc1f903
Fixed in
  • c20f755338ca234e523dfc943719f194dfc1f903
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < 2566866fc30965d915d0b52b5c3323b362619f0e
Fixed in
  • 2566866fc30965d915d0b52b5c3323b362619f0e
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < 97f907203321eee2cc9132d5c9eb47698fb41d35
Fixed in
  • 97f907203321eee2cc9132d5c9eb47698fb41d35
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < 43efb1f997e976f386aa89716f55870cd2cff9ad
Fixed in
  • 43efb1f997e976f386aa89716f55870cd2cff9ad
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < 40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f
Fixed in
  • 40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f
LinuxLinuxAffected
  • ≥ fe881ef11cf0220f118816181930494d484c4883, < 4b9bc21b2396c396d88dd909caaf73d5be6ff593
Fixed in
  • 4b9bc21b2396c396d88dd909caaf73d5be6ff593

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

AI-suggested

No specific mitigation or remediation instructions are provided in the available information.

Description

This vulnerability, identified as CVE-2026-98621, relates to the network component 'gue' in Microsoft software, specifically addressing the rejection of invalid REMCSUM offsets. The advisory references Microsoft's support lifecycle for software but does not provide detailed technical or impact information.

References

Community reviews

Loading reviews…