Skip to content
Fencer Intel
high 7.8

CVE-2025-20109 json

Improper Isolation or Compartmentalization in the stream cache mechanism for some Intel(R) Processors may allow an authenticated user to po…

published last yr. modified 4mo ago also EUVD-2025-24431

cvss
7.8
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 4%
public exploits
0
none known

Summary

Improper Isolation or Compartmentalization in the stream cache mechanism for some Intel(R) Processors may allow an authenticated user to potentially enable escalation of privilege via local access.

Patch / fix

  • intel-microcode Debian 12 3.20250812.1~deb12u1
  • intel-microcode Debian 13 3.20250812.1~deb13u1
  • intel-microcode Debian 14 3.20250812.1

debian advisories DEBIAN-CVE-2025-20109

  • intel-microcode Ubuntu 22.04 LTS 3.20250812.0ubuntu0.22.04.1
  • intel-microcode Ubuntu 24.04 LTS 3.20250812.0ubuntu0.24.04.1
  • intel-microcode Ubuntu 25.10 3.20250812.0ubuntu0.25.10.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20250812.0ubuntu0.16.04.1+esm1
  • intel-microcode Ubuntu Pro 18.04 LTS 3.20250812.0ubuntu0.18.04.1+esm1
  • intel-microcode Ubuntu Pro 20.04 LTS 3.20250812.0ubuntu0.20.04.1+esm1

ubuntu advisories UBUNTU-CVE-2025-20109

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 Linux Micro 6.0 20250812-1.1
  • ucode-intel Linux Micro 6.1 20250812-slfo.1.1_1.1
  • ucode-intel SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +19 more 20250812-150200.59.1
  • microcode_ctl SLES 11 SP4 LTSS EXTREME CORE 1.17-102.83.87.1
  • ucode-intel SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 20250812-155.1

suse advisories SUSE-SU-2025:20715-1SUSE-SU-2025:03116-1SUSE-SU-2025:20691-1SUSE-SU-2025:03053-1SUSE-SU-2025:03052-1

  • ucode-intel openSUSE Tumbleweed 20250812-1.1

opensuse advisories openSUSE-SU-2025:15491-1

  • intel-ucode Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 20250812-r0

alpine advisories ALPINE-CVE-2025-20109

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

Is CVE-2025-20109 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

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

CVSS scores

assigned by version score vector
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/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) Processors

Classification

Weakness
  • CWE-653 Improper Isolation or Compartmentalization

References

Sources

Fencer Intel 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.