Security readout for executives and security teams
Plain-English summary
This flaw lets someone who already has local, authorized access to an affected Windows system potentially gain higher privileges through Hyper-V. It is not described as remotely exploitable, but it matters on virtualization hosts and developer systems because successful elevation could affect confidentiality, integrity, and availability.
Executive priority
Treat this as a high-priority patching item for virtualization and administrative endpoints, not an internet-edge emergency. The business concern is privilege escalation after initial access, especially on systems that host or manage workloads.
Technical view
CVE-2026-25170 is a Windows Hyper-V use-after-free vulnerability, classified as CWE-416. Microsoft rates it CVSS 3.1 score 7.0 with local attack vector, high complexity, low privileges required, no user interaction, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is most relevant to listed Windows 11 and Windows Server versions where Hyper-V is present or used. The source bundle does not provide deeper configuration prerequisites beyond Microsoft’s affected product list.
Exploitation context
The bundle marks KEV as false and the CVSS vector indicates exploit maturity is unproven. There is no cited evidence of active exploitation. An attacker would need local, low-privileged access and must overcome high attack complexity.
Researcher notes
Evidence is limited to the CVE record and Microsoft advisory metadata. The provided sources identify a use-after-free in Hyper-V but do not describe root cause details, attack primitives, exploit chains, or alternative mitigations.
Mitigation direction
- Apply the Microsoft security update for CVE-2026-25170 on affected Windows systems.
- Prioritize Hyper-V hosts, Windows Server virtualization infrastructure, and developer workstations using Hyper-V.
- If patching is delayed, review Microsoft guidance for supported workarounds or compensating controls.
- Limit local interactive access to systems that host Hyper-V workloads.
- Monitor MSRC for revised affected-build or mitigation details.
Validation and detection
- Inventory Windows 11 and Windows Server versions listed in the Microsoft advisory.
- Confirm whether Hyper-V is installed or enabled on inventoried systems.
- Verify the relevant Microsoft update is installed through patch-management evidence.
- Check vulnerability scanners map CVE-2026-25170 to the affected assets correctly.
- Review local access paths to Hyper-V hosts for unnecessary low-privilege users.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-25170 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C15.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows Hyper-V Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.