Vulnerability · Published Aug 11, 2026 · Assigned by intel
CVE-2025-31936
High 7.0
In plain English
A high-severity security flaw in Intel(R) Xeon(R) 6 processors when using Intel(R) TDX. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | microcode_ctl | 4:20260812-0.el10_2 | ALSA-2026:67979 |
| AlmaLinux:8 | microcode_ctl | 4:20260812-1.el8_10 | ALSA-2026:65147 |
| AlmaLinux:9 | microcode_ctl | 4:20260210-1.20260812.1.el9_8 | ALSA-2026:68011 |
| Debian:12 | intel-microcode | no fix listed | DEBIAN-CVE-2025-31936 |
| Debian:13 | intel-microcode | no fix listed | DEBIAN-CVE-2025-31936 |
| Debian:14 | intel-microcode | 3.20260925.1 | DEBIAN-CVE-2025-31936 |
| Rocky Linux:10 | microcode_ctl | 4:20260812-0.el10_2 | RLSA-2026:67979 |
| Rocky Linux:8 | microcode_ctl | 4:20260812-1.el8_10 | RLSA-2026:65147 |
| Rocky Linux:9 | microcode_ctl | 4:20260210-1.20260812.1.el9_8 | RLSA-2026:68011 |
| Ubuntu:22.04:LTS | intel-microcode | no fix listed | UBUNTU-CVE-2025-31936 |
| Ubuntu:24.04:LTS | intel-microcode | no fix listed | UBUNTU-CVE-2025-31936 |
| Ubuntu:26.04:LTS | intel-microcode | no fix listed | UBUNTU-CVE-2025-31936 |
| Ubuntu:26.10 | intel-microcode | no fix listed | UBUNTU-CVE-2025-31936 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Intel(R) Xeon(R) 6 processors when using Intel(R) TDX | See references |
Weakness: CWE-1260 · Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N