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ALSA-2026:65147 — Important: microcode_ctl security, bug fix, and enhancement update

Affected: AlmaLinux:8: microcode_ctl

The microcode_ctl packages provide microcode updates for Intel and AMD processors.

Security Fix(es):

* kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling (CVE-2025-35973) * kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM (CVE-2025-31936)

Bug Fix(es) and Enhancement(s):

* [AlmaLinux 8] Update Intel CPU microcode to the latest version (JIRA:AlmaLinux-240770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

BELL-CVE-2025-35973

Affected: Alpaquita:23: intel-ucode, Alpaquita:25: intel-ucode, Alpaquita:stream: intel-ucode

EUVD-2026-351663

fkie_cve-2025-35973

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.

GHSA-g4r3-3x88-prrw

OESA-2026-3408 — microcode_ctl security update

Affected: openEuler:20.03-LTS-SP4: microcode_ctl, openEuler:22.03-LTS-SP4: microcode_ctl, openEuler:24.03-LTS-SP1: microcode_ctl, openEuler:24.03-LTS-SP3: microcode_ctl, openEuler:24.03-LTS-SP4: microcode_ctl

This is a tool to transform and deploy microcode update for x86 CPUs. Security Fix(es):

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.(CVE-2025-31936)

Insufficient granularity of access control in some subsystem for some Intel(R) Xeon(R) 6 Scalable processors with Intel(R) TDX may allow an information disclosure. Authorized adversary with an authenticated user combined with a high complexity attack may enable data exposure. 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 (none), integrity (none) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (none) and availability (none) impacts.(CVE-2025-31938)

Improper handling of valu…

openSUSE-SU-2026:11599-1 — ucode-intel-20260812-1.1 on GA media

ucode-intel-20260812-1.1 on GA media

RLSA-2026:65147 — Important: microcode_ctl security, bug fix, and enhancement update

Affected: Rocky Linux:8: microcode_ctl

The microcode_ctl packages provide microcode updates for Intel and AMD processors.

Security Fix(es):

* kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling (CVE-2025-35973)

* kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM (CVE-2025-31936)

Bug Fix(es) and Enhancement(s):

* [Rocky Linux 8] Update Intel CPU microcode to the latest version (JIRA:Rocky Linux-240770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:23449-1 — Security update for ucode-intel

Security update for ucode-intel

UBUNTU-CVE-2025-35973

Affected: Ubuntu:Pro:14.04:LTS: intel-microcode, Ubuntu:Pro:16.04:LTS: intel-microcode, Ubuntu:Pro:18.04:LTS: intel-microcode, Ubuntu:Pro:20.04:LTS: intel-microcode, Ubuntu:22.04:LTS: intel-microcode, Ubuntu:24.04:LTS: intel-microcode, Ubuntu:26.04:LTS: intel-microcode