In the Linux kernel, the following vulnerability has been resolved: x86/vmware: Fix hypercall clobbers Fedora QA reported the following panic: BUG:… (CVE-2026-23215)
A vulnerability in the Linux kernel's x86 VMware hypercall interface caused a kernel panic due to improper handling of register state by the QEMU VMware mouse emulation driver. This bug led to a page fault by clearing the upper 32 bits of a pointer register, resulting in an invalid kernel address access. The issue affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability has been assigned CVE-2026-23215 and is rated medium severity with a CVSS score of 5.5. A patch is available and included in updated Linux kernel packages. Users are advised to update and reboot to apply the fix.
AI Analysis
Technical Summary
CVE-2026-23215 is a medium severity vulnerability in the Linux kernel affecting the x86 VMware hypercall interface. The flaw arises from the QEMU VMware mouse emulation driver improperly saving and restoring the register state, specifically clearing the top 32 bits of the %rdi register which originally contained a valid kernel stack pointer. This leads to a kernel panic due to a page fault when the kernel attempts to access an invalid address. The issue was reported by Fedora QA and affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability does not impact confidentiality or integrity but causes denial of service (kernel crash). Ubuntu has released security advisories (USN-8278-1, USN-8289-1) addressing this and other kernel vulnerabilities, providing patched kernel versions. Users must update their systems and reboot to apply the fixes. Due to ABI changes, recompilation of third-party kernel modules may be required.
Potential Impact
The vulnerability causes a kernel panic (denial of service) due to a page fault triggered by improper register state restoration in the VMware mouse emulation driver on x86 architectures. There is no impact on confidentiality or integrity reported. The CVSS v3.1 score is 5.5 (medium), reflecting local attack vector with low complexity and no user interaction required, but limited to causing availability impact only.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributors. Users should update their Linux kernel packages to versions 6.8.0-1055.56 or later (and related patched builds) as specified in the vendor advisories USN-8278-1 and USN-8289-1. After updating, a system reboot is required to apply the fixes. Due to ABI changes, recompilation and reinstallation of any third-party kernel modules are necessary. No other mitigations are indicated or required.
In the Linux kernel, the following vulnerability has been resolved: x86/vmware: Fix hypercall clobbers Fedora QA reported the following panic: BUG:… (CVE-2026-23215)
Description
A vulnerability in the Linux kernel's x86 VMware hypercall interface caused a kernel panic due to improper handling of register state by the QEMU VMware mouse emulation driver. This bug led to a page fault by clearing the upper 32 bits of a pointer register, resulting in an invalid kernel address access. The issue affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability has been assigned CVE-2026-23215 and is rated medium severity with a CVSS score of 5.5. A patch is available and included in updated Linux kernel packages. Users are advised to update and reboot to apply the fix.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-23215 is a medium severity vulnerability in the Linux kernel affecting the x86 VMware hypercall interface. The flaw arises from the QEMU VMware mouse emulation driver improperly saving and restoring the register state, specifically clearing the top 32 bits of the %rdi register which originally contained a valid kernel stack pointer. This leads to a kernel panic due to a page fault when the kernel attempts to access an invalid address. The issue was reported by Fedora QA and affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability does not impact confidentiality or integrity but causes denial of service (kernel crash). Ubuntu has released security advisories (USN-8278-1, USN-8289-1) addressing this and other kernel vulnerabilities, providing patched kernel versions. Users must update their systems and reboot to apply the fixes. Due to ABI changes, recompilation of third-party kernel modules may be required.
Potential Impact
The vulnerability causes a kernel panic (denial of service) due to a page fault triggered by improper register state restoration in the VMware mouse emulation driver on x86 architectures. There is no impact on confidentiality or integrity reported. The CVSS v3.1 score is 5.5 (medium), reflecting local attack vector with low complexity and no user interaction required, but limited to causing availability impact only.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributors. Users should update their Linux kernel packages to versions 6.8.0-1055.56 or later (and related patched builds) as specified in the vendor advisories USN-8278-1 and USN-8289-1. After updating, a system reboot is required to apply the fixes. Due to ABI changes, recompilation and reinstallation of any third-party kernel modules are necessary. No other mitigations are indicated or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23215
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b62ff2d1edb114c8a4830
Added to database: 07/18/2026, 11:26:56 UTC
Last enriched: 08/01/2026, 07:09:08 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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