High [CVE-2025-35973] Privilege escalation in Ring 0 via improper value handling
This high-severity Red Hat Linux advisory covers CVE-2025-35973 affecting Red Hat Enterprise Linux 8, Confidential Compute Attestation, Red Hat Enterprise Linux 10.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
Improper handling of values for some Intel(R) Processors within Ring 0: Kernel, Hypervisor and Bare Metal OS may allow an escalation of privilege. Authorized adversary with a privileged user combined with a high complexity attack may enable escalation of privilege.
This result may potentially occur via local access when attack requirements are present with special internal knowledge and require no user interaction.
The potential vulnerability may impact the confidentiality (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (none) impacts.
Red Hat is aware of a hardware vulnerability affecting some Intel processors that could allow a local attacker who already has privileged access to escalate privileges by exploiting improper handling of internal processor values during Ring 0 execution.
In the most severe case, this could allow a privileged workload running inside a virtual machine to escalate access into the underlying hypervisor. Exploitation requires local access, existing privileged access, and a high degree of attack complexity, including detailed knowledge of the processor's internal behavior.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
- microcode_ctl-4:20260812-1.el8_10
- RHSA-2026:65147
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Mitigation checklist
- This is a hardware-level vulnerability in the affected Intel processors. There is no code-level fix available in Red Hat OpenShift sandboxed containers or other affected Red Hat components; the issue must be addressed at the processor firmware layer. Red Hat recommends that customers apply the latest CPU microcode or system firmware update from their hardware manufacturer. Intel has released microcode updates addressing this issue; see Intel Security Advisory INTEL-SA-01428 (https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01428.html) for affected processor families and update guidance. Intel has indicated that a further Trusted Computing Base (TCB) recovery is planned for this issue. Red Hat will update this guidance if additional remediation steps become necessary once that information is available.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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