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Intel® Xeon® 6 Processor Firmware Advisory
| Intel ID: | INTEL-SA-01367 |
|---|---|
| Advisory Category: | Hardware |
| Impact of vulnerability: | Escalation of Privilege |
| Severity rating: | HIGH |
| Original release: | 08/12/2025 |
| Last revised: | 08/18/2025 |
Summary:
Potential security vulnerabilities for some Intel® Xeon® 6 Processors when using Intel® Software Guard Extensions (Intel® SGX) or Intel® Trust Domain Extensions (Intel® TDX) may allow escalation of privilege. Intel is releasing microcode updates to mitigate these potential vulnerabilities.
Vulnerability Details:
CVEID: CVE-2025-26403
Description: Out-of-bounds write in the memory subsystem for some Intel® Xeon® 6 processors when using Intel® SGX or Intel® TDX may allow a privileged user to potentially enable escalation of privilege via local access.
CVSS Base Score 3.1: 7.2 High
CVSS Vector 3.1: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
CVSS Base Score 4.0: 4.5 Medium
CVSS Vector 4.0: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CVEID: CVE-2025-32086
Description: Improperly implemented security check for standard in the DDRIO configuration for some Intel® Xeon® 6 Processors when using Intel® SGX or Intel® TDX may allow a privileged user to potentially enable escalation of privilege via local access.
CVSS Base Score 3.1: 7.2 High
CVSS Vector 3.1: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
CVSS Base Score 4.0: 4.5 Medium
CVSS Vector 4.0: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Affected Products:
Product Collection
|
Processor/SOC Code name
|
Vertical Segment
|
CPU ID
|
Platform ID
|
Intel® Xeon® 6 processor with P-cores
|
Birch Stream
|
Server
|
A06D1 A06E1
|
0x95 0x20
|
Intel® Xeon® 6 processor with E-Cores |
Birch Stream |
Server |
A06F3 |
0x01 |
Recommendation:
Intel recommends that users of affected Intel® Xeon® 6 Processors update to the latest version firmware provided by the system manufacturer that addresses these issues.
Intel has released microcode updates for the affected Intel® Xeon® 6 Processors that are currently supported on the public github repository as listed below.
A TCB recovery will be planned after public disclosure. Future guidance will be updated in Intel communications as more information about the upcoming TCB recovery becomes available.
Related Content:
- Please see details below on access to the microcode: Public Github: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files
- Microcode loading points: https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/secure-coding/loading-microcode-os.html
- Trusted Computing Base Recovery of Intel Trusted Execution Environments
Acknowledgements:
This following issues were found internally by Intel employees. Intel would to thank Aviv Eisen and Avraham Shalev.
Intel, and nearly the entire technology industry, follows a disclosure practice called Coordinated Disclosure, under which a cybersecurity vulnerability is generally publicly disclosed only after mitigations are available.
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