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Fencer Vulns
low 3.9

CVE-2025-31648 json

Improper handling of values in the microcode flow for some Intel(R) Processor Family may allow an escalation of privilege.

published 2026-02-10 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-207126

cvss
3.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

Improper handling of values in the microcode flow for some Intel(R) Processor Family may allow an escalation of privilege. Startup code and 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 (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (low), integrity (low) and availability (none) impacts.

Patch / fix

  • intel-microcode Debian 14 3.20260210.1

debian advisories DEBIAN-CVE-2025-31648

  • intel-microcode Ubuntu 22.04 LTS 3.20260210.0ubuntu0.22.04.1
  • intel-microcode Ubuntu 24.04 LTS 3.20260210.0ubuntu0.24.04.1
  • intel-microcode Ubuntu 25.10 3.20260210.0ubuntu0.25.10.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20260210.0ubuntu0.16.04.1+esm1
  • intel-microcode Ubuntu Pro 18.04 LTS 3.20260210.0ubuntu0.18.04.1+esm1
  • intel-microcode Ubuntu Pro 20.04 LTS 3.20260210.0ubuntu0.20.04.1+esm1

ubuntu advisories UBUNTU-CVE-2025-31648

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ucode-intel SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 20260210-160000.1.1
  • ucode-intel Linux Micro 6.1 20260210-slfo.1.1_1.1
  • ucode-intel SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +13 more 20260210-150200.62.1
  • ucode-intel Linux Micro 6.0 20260210-1.1
  • microcode_ctl SLES 11 SP4 LTSS EXTREME CORE 1.17-102.83.90.1
  • ucode-intel SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 20260210-158.1

suse advisories SUSE-SU-2026:20758-1SUSE-SU-2026:20941-1SUSE-SU-2026:20682-1SUSE-SU-2026:0670-1SUSE-SU-2026:0669-1SUSE-SU-2026:0668-1

  • ucode-intel openSUSE Leap 16.0 20260210-160000.1.1
  • ucode-intel openSUSE Tumbleweed 20260210-1.1

opensuse advisories openSUSE-SU-2026:20401-1openSUSE-SU-2026:10229-1

  • intel-ucode Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 20260210-r0

alpine advisories ALPINE-CVE-2025-31648

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-31648 updated cvss 2.5

microcode_ctl: From CVEorg collector

  • Red Hat Enterprise Linux 6 microcode_ctl Red Hat Enterprise Linux 7 microcode_ctl Red Hat Enterprise Linux 8 microcode_ctl Red Hat Enterprise Linux 9 microcode_ctl Red Hat Enterprise Linux 10 microcode_ctl
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 1.8 CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CNA 3.1 3.9 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
CNA 4.0 1.8 CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • n/a Intel(R) Processor Family may allow an escalation of privilege. Startup code and 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 (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (low), integrity (low) and availability (none) impacts.

Classification

Weakness
  • CWE-229 Improper Handling of Values

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.