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TI-2026-21124 Aliases CVE-2026-26131GHSA-crjq-wm6x-6qx7

.NET Elevation of Privilege Vulnerability

Priority LOW 36CWE-276Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub, Red Hat and Microsoft. Impact type from Microsoft.

Summary

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00398 34th percentileScored 2026-11-07
Fix Partial Microsoft.NetCore.App.Runtime.linux-arm (NuGet): 10.0.4Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): 10.0.4+4 more productsRed Hat: 1 advisoryMicrosoft: 1 updateRed Hat: 1 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Microsoft.NET 10.010.0.0 to before 10.0.410.0.4Patch availableCNA
—Microsoft.NetCore.App.Runtime.linux-arm (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
—Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
—Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
—Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
—Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
—Microsoft.NetCore.App.Runtime.linux-x64 (NuGet)10.0.0 to before 10.0.410.0.4Patch availableGHSA-crjq-wm6x-6qx7
  • .NET 10.0 VendorMicrosoft Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available CNA
  • Microsoft.NetCore.App.Runtime.linux-arm (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.4 Fixed in 10.0.4 Patch available GHSA-crjq-wm6x-6qx7

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*10.0.0 to before 10.0.4VulnerableMicrosoft
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*not specified by NVDRunning onLinux
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 10.0.0 to before 10.0.4 Vulnerable ·Microsoft
  • cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux

Remediation

  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-arm (NuGet) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet) Fixed in 10.0.4 Advisory →
  • Fix · GHSA-crjq-wm6x-6qx7 Microsoft.NetCore.App.Runtime.linux-x64 (NuGet) Fixed in 10.0.4 Advisory →

Red Hat 1 advisory

  • RHSA-2026:9077 Released 2026-04-20 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet10.0-10.0.106-1.hum1@src

Microsoft 1 update

  • KB5081276
    Security Update
    • .NET 10.0 installed on Linux 10.0.4
    • .NET 10.0 installed on Mac OS 10.0.4
    • .NET 10.0 installed on Windows 10.0.4
    • ASP.NET Core 10.0 10.0.4

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:9077
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26131
  2. 2026-10-03 Alias added: GHSA-crjq-wm6x-6qx7

References

Patch 1

Advisory 1

Other 2

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
  • TI-2023-19588 Microsoft QUIC Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2024-14152 .NET and Visual Studio Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2021-08380 .NET Core Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
See all 129 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences