Medium [CVE-2025-31936] Privilege escalation via improper memory range handling in SMM
This medium-severity Red Hat Linux advisory covers CVE-2025-31936 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Improper handling of overlap between protected memory ranges for some Intel(R) Xeon(R) 6 processors when using Intel(R) TDX within SMM may allow an escalation of privilege. SMM 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 requires no user interaction.
The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
Improper handling of overlap between protected memory ranges may allow a local attacker with privileged user access to escalate privileges. This Important privilege escalation flaw affects Intel Xeon 6 Processors when Intel TDX is enabled, allowing a privileged local attacker to escalate privileges within the System Management Mode (SMM).
Exploitation requires a high complexity attack and specific internal knowledge, impacting the confidentiality and integrity of the system. Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N).
Weakness: CWE-823.
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 vulnerability only affects systems using Intel Trust Domain Extensions (TDX) on Intel Xeon 6 processors. Systems not using Intel TDX are not vulnerable to this issue. Disabling Intel TDX, where feasible, removes the exposure to this vulnerability.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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