CVE-2025-52536

amd64-microcode: Improper Prevention of Lock Bit Modification in SEV firmware could allow a privileged attacker to downgrade firmware...

CVE-2025-52536 is fixed in amd64-microcode on 1 platform by DEBIAN-CVE-2025-52536 (version 3.20260923.1), released February 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

n/a

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0016

5th percentile

Improper Prevention of Lock Bit Modification in SEV firmware could allow a privileged attacker to downgrade firmware potentially resulting in a loss of integrity.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
amd64-microcode · Debian 14	3.20260923.1	DEBIAN-CVE-2025-52536	Feb 10, 2026

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