CVE-2026-98900VulnerabilityPublished 24 Oct 2026Updated 2 Nov 2026

Microsoft · xen/gntalloc: validate grant count before allocation

Affects MicrosoftSource GCVE Database

Compare

Authoritative record:CVE-2026-98900

Not known to be exploited · fixed in e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 : update Microsoft when convenient.

Data as of 2 Nov 2026, 10:58 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8, 2299822f3f466b5dcad2377bf63986199f881a6b, 720554c04acba80018ded069d3e0984bebaee891 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

microsoft-security-response-ce

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8	Fixed in e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < 2299822f3f466b5dcad2377bf63986199f881a6b	Fixed in 2299822f3f466b5dcad2377bf63986199f881a6b
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < 720554c04acba80018ded069d3e0984bebaee891	Fixed in 720554c04acba80018ded069d3e0984bebaee891
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < 231542f4e43cf9837cb520664545e85fbe666b7b	Fixed in 231542f4e43cf9837cb520664545e85fbe666b7b
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < 641de086a05f349de7fc548612432bc2fed721ca	Fixed in 641de086a05f349de7fc548612432bc2fed721ca
LinuxLinux	Affected ≥ dd3140588d9551235ebc2a0dacdca098e7677573, < 84d5727cef8eb9c8a28210ad248f1c70b223b065	Fixed in 84d5727cef8eb9c8a28210ad248f1c70b223b065

Description

CVE-2026-98900 concerns a vulnerability in Microsoft software related to the validation of grant counts before allocation. The details are minimal, with no CVSS score or explicit impact described. The affected versions are 3.0 and 4.0. No known exploits or patches are currently documented.

Impact

The impact is not explicitly described in the available data. Without detailed information, the potential consequences of this vulnerability cannot be accurately assessed.

Summary

This vulnerability involves improper validation of grant counts prior to allocation in Microsoft software versions 3.0 and 4.0. The provided information lacks technical specifics, impact details, or remediation status. No public exploit code or known exploitation in the wild has been reported as of the published date.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 2 Nov 2026, 09:28 UTC

Technical details

References

Community reviews

Related threats