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Fencer Vulns
medium 5.6

CVE-2025-20623 json

Exposure of sensitive information caused by shared microarchitectural predictor state that influences transient execution for some Intel(R)…

published 2025-05-13 17 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-14553

cvss
5.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

Exposure of sensitive information caused by shared microarchitectural predictor state that influences transient execution for some Intel(R) Core™ processors (10th Generation) may allow an authenticated user to potentially enable information disclosure via local access.

Patch / fix

  • intel-microcode Debian 12 3.20250512.1~deb12u1
  • intel-microcode Debian 14, Debian 13 3.20250512.1

debian advisories DEBIAN-CVE-2025-20623

  • intel-microcode Ubuntu 20.04 LTS 3.20250512.0ubuntu0.20.04.1
  • intel-microcode Ubuntu 22.04 LTS 3.20250512.0ubuntu0.22.04.1
  • intel-microcode Ubuntu 24.04 LTS 3.20250512.0ubuntu0.24.04.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20250512.0ubuntu0.16.04.1+esm1
  • intel-microcode Ubuntu Pro 18.04 LTS 3.20250512.0ubuntu0.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2025-20623

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

  • microcode_ctl RHEL 8 4:20250512-1.el8_10
  • microcode_ctl RHEL 9 4:20250211-1.20250512.1.el9_6
  • microcode_ctl RHEL 8.8 TUS, RHEL 8.8 E4S 4:20220809-2.20250512.1.el8_8
  • microcode_ctl RHEL 8.2 AUS 4:20191115-4.20250512.1.el8_2
  • microcode_ctl RHEL 7.7 AUS 2:2.1-53.26.el7_7.1
  • microcode_ctl RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 4:20220207-1.20250512.1.el8_6
  • microcode_ctl RHEL 8.4 AUS 4:20210216-1.20250512.1.el8_4
  • microcode_ctl RHEL 7 ELS 2:2.1-73.24.el7_9

red hat advisories RHSA-2025:10991RHBA-2025:9433RHSA-2025:10162RHSA-2025:10126RHSA-2025:10111RHSA-2025:10109

  • ucode-intel Linux Micro 6.0 20250512-1.1
  • ucode-intel Linux Micro 6.1 20250512-slfo.1.1_1.1
  • ucode-intel SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, SLE Micro 5.5 +19 more 20250512-150200.56.1
  • ucode-intel SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 20250512-152.1
  • microcode_ctl SLES 11 SP4 LTSS EXTREME CORE 1.17-102.83.84.1

suse advisories SUSE-SU-2025:20410-1SUSE-SU-2025:20424-1SUSE-SU-2025:01651-2SUSE-SU-2025:01651-1SUSE-SU-2025:01650-1SUSE-SU-2025:1567-1

  • spectre-meltdown-checker openSUSE Tumbleweed 26.36.0602723-1.1
  • ucode-intel openSUSE Tumbleweed 20250512-1.1

opensuse advisories openSUSE-SU-2026:11242-1openSUSE-SU-2025:15093-1

  • microcode_ctl AlmaLinux 8 4:20250512-1.el8_10

almalinux advisories ALSA-2025:10991

  • microcode_ctl Rocky Linux 8 4:20250512-1.el8_10

rocky linux advisories RLSA-2025:10991

  • intel-ucode Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 20250512-r0

alpine advisories ALPINE-CVE-2025-20623

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-2025-20623 updated cvss 5.6

microcode_ctl: Exposure of sensitive information

  • Red Hat Enterprise Linux 6 microcode_ctl
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux BaseOS (v. 8) microcode_ctl 20250512-1.el8_10
    fixed: vendor fix RHSA-2025:10991
  • Red Hat Enterprise Linux BaseOS (v. 9) microcode_ctl 20250211-1.20250512.1.el9_6
    fixed: vendor fix RHBA-2025:9433
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) microcode_ctl 20191115-4.20250512.1.el8_2
    fixed: vendor fix RHSA-2025:10126
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) microcode_ctl 20210216-1.20250512.1.el8_4
    fixed: vendor fix RHSA-2025:10107
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) microcode_ctl 20220207-1.20250512.1.el8_6 Red Hat Enterprise Linux BaseOS E4S (v.8.6) microcode_ctl 20220207-1.20250512.1.el8_6
    fixed: vendor fix RHSA-2025:10109
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) microcode_ctl 20220809-2.20250512.1.el8_8
    fixed: vendor fix RHSA-2025:10162
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) microcode_ctl 20220207-1.20250512.1.el9_0
    fixed: vendor fix RHSA-2025:10103
show 7 more
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) microcode_ctl 20220809-2.20250512.1.el9_2
    fixed: vendor fix RHSA-2025:10102
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) microcode_ctl 20230808-2.20250512.1.el9_4
    fixed: vendor fix RHSA-2025:10101
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) microcode_ctl 20220207-1.20250512.1.el8_6
    fixed: vendor fix RHSA-2025:10109
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) microcode_ctl 20220809-2.20250512.1.el8_8
    fixed: vendor fix RHSA-2025:10162
  • Red Hat Enterprise Linux Server (v. 7 ELS) microcode_ctl 2.1-73.24.el7_9
    fixed: vendor fix RHSA-2025:10108
  • Red Hat Enterprise Linux Server AUS (v. 7.7) microcode_ctl 2.1-53.26.el7_7.1
    fixed: vendor fix RHSA-2025:10111
  • Red Hat Enterprise Linux 10 microcode_ctl
    not affected: vulnerable code not present

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
partial
Assessed
17 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.7 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 3.1 5.6 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
CNA 4.0 5.7 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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) Core™ processors (10th Generation)

Classification

Weakness
  • CWE-1423 Exposure of Sensitive Information caused by Shared Microarchitectural Predictor State that Influences Transient Execution

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.