Security readout for executives and security teams
Plain-English summary
This is a Linux kernel hardware-mode handling issue on x86. Some BIOSes can lock systems into x2APIC mode for SGX/TDX and to avoid legacy APIC risks. Older kernels may try to change that locked state and fault. Treat it as a platform stability and secure-configuration issue, not a broadly demonstrated remote attack.
Executive priority
Prioritize for Linux fleets running newer Intel security features or tightly controlled firmware configurations. It is not currently supported as an actively exploited threat, but it can affect system reliability and secure platform configuration. Handle through normal kernel maintenance unless affected platforms show instability.
Technical view
The x86 APIC code could attempt to disable x2APIC or return to legacy xAPIC even when BIOS locked x2APIC via IA32_XAPIC_DISABLE_STATUS. On such platforms this can trigger a general protection fault. The stable kernel changes detect LEGACY_XAPIC_DISABLED and prevent disabling x2APIC when it is locked.
Likely exposure
Exposure appears limited to Linux on x86 platforms using affected kernel versions and firmware that locks x2APIC, especially when SGX or TDX are enabled. The source lists Linux kernel versions including 3.3, 5.19.17, 6.0.3, and 6.1 as affected, but distribution backports may change actual status.
Exploitation context
CISA KEV is false, and the provided sources do not state active exploitation. The issue is configuration and platform dependent. The description references APIC LEAK as background risk for legacy APIC MMIO, but this CVE concerns safely honoring BIOS-locked x2APIC mode.
Researcher notes
Evidence is limited to the CVE record and Linux stable commits. No CVSS, CWE, exploit status, or distribution-specific fixed versions are provided. Validate impact against kernel backports and hardware firmware behavior before classifying individual assets as vulnerable.
Mitigation direction
- Update to a Linux kernel containing the referenced stable fixes or a distribution backport.
- Check Linux distribution advisories for exact fixed package versions.
- If legacy APIC is required, review vendor guidance about disabling SGX and TDX in BIOS.
- Avoid changing BIOS APIC, SGX, or TDX settings without platform owner approval.
Validation and detection
- Inventory x86 Linux systems and kernel versions.
- Identify systems with SGX or TDX enabled in firmware.
- Confirm whether vendors have backported the referenced x2APIC lock handling commits.
- Review boot or kernel logs for APIC mode errors or general protection faults.
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.
CVE-2022-50720 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
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.