CVE-2026-68267 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
drm/xe/rtp: Add RING_FORCE_TO_NONPRIV_DENY to OA whitelists
Unconditionally whitelisting OA registers is a security violation. Set RING_FORCE_TO_NONPRIV_DENY bit in OA nonpriv slots, so that OA registers don't get whitelisted by default after probe, gt reset, resume and engine reset.
(cherry picked from commit 90511bdcfda97211c01f1d945d4ea616578d8fca)
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Analysis
by VulDB Data Team • 08/10/2026
This vulnerability addresses a critical security flaw in the Linux kernel's graphics subsystem, specifically within the intel graphics driver's OA (Onboard Analytics) register handling mechanism. The issue stems from an improper privilege management approach where OA registers were being unconditionally whitelisted, creating a significant attack surface that could be exploited by malicious actors to gain unauthorized access to privileged system resources.
The technical flaw manifests in how the kernel handles OA register access control during various system states including probe operations, graphics tile resets, system resume events, and engine resets. The vulnerability occurs because the system was automatically granting full access to OA registers without proper privilege checks, effectively bypassing the normal security boundaries that should protect sensitive hardware registers from unauthorized modification or access.
This security violation directly contravenes established principles of least privilege and privilege separation that are fundamental to secure system design. The improper whitelisting allows potential attackers to manipulate graphics hardware registers that should remain restricted to privileged kernel components only, creating opportunities for privilege escalation attacks and system compromise.
The operational impact of this vulnerability extends beyond simple access control violations as it affects the integrity and confidentiality of graphics processing operations within the kernel. When OA registers are improperly exposed, malicious code could potentially monitor or manipulate performance counters, debug information, or other sensitive analytics data that should remain protected from user-space applications or untrusted processes.
The fix implemented addresses this issue by introducing the RING_FORCE_TO_NONPRIV_DENY bit into the OA whitelists for non-privileged slots. This change ensures that OA registers do not get automatically whitelisted by default during system operations, thereby maintaining proper access controls and preventing unauthorized access to privileged hardware resources. The solution follows established security patterns that require explicit privilege validation before granting access to sensitive system components.
This vulnerability aligns with CWE-276 (Insecure Default Permissions) and CWE-377 (Insecure Temporary File or Directory) categories, representing a failure to properly enforce access controls during system state transitions. The mitigation strategy directly addresses ATT&CK technique T1068 (Local Privilege Escalation) by preventing unauthorized access to graphics hardware registers that could be leveraged for privilege escalation.
The implementation approach of cherry-picking the specific commit ensures that the fix is applied consistently across different kernel versions while maintaining compatibility with existing system functionality. This targeted approach demonstrates proper vulnerability remediation practices where the solution addresses the root cause rather than merely patching symptoms, ensuring that graphics hardware access controls remain properly enforced throughout all system operational states including recovery and reset scenarios.
The security implications of this fix extend to protecting against potential side-channel attacks that could exploit the improperly exposed OA registers to extract sensitive information or manipulate system behavior. By requiring explicit privilege validation for OA register access, the kernel maintains proper isolation between privileged and unprivileged operations while preserving legitimate functionality required for graphics performance monitoring and debugging.