1.8

CVE-2025-48509: amd64-microcode Improper Initialization

Deferred
AliasesUBUNTU-CVE-2025-48509DEBIAN-CVE-2025-48509
Published 10-02-2026Last modified 11-02-2026

Vulnerability summary

CVE-2025-48509 is a low (CVSS 1.8) Improper Initialization vulnerability in amd64-microcode. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 1.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
1.8/10
010
Low · v4.0 (CVE.org)
EPSS score
0.13%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 10-02-2026
    PublishedVulnerability first disclosed.
  2. 11-02-2026
    Last modifiedVulnerability information updated.

Description

Missing Checks in certain functions related to RMP initialization can allow a local admin privileged attacker to cause misidentification of I/O memory, potentially resulting in a loss of guest memory integrity

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.12% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • amd64-microcodeAll versions (No fix recorded)
Ubuntu1 product
  • amd64-microcodeAll versions (No fix recorded)

2 vendors · 2 products

References

4 links