SB2025051947 - Indirect branch predictor vulnerability in Intel processors

Description

This security bulletin contains information about 3 vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2024-43420)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to shared microarchitectural predictor state that influences transient execution. A local user can gain access to sensitive information.

2) Information disclosure (CVE-ID: CVE-2025-20623)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to shared microarchitectural predictor state that influences transient execution. A local user can gain access to sensitive information.

3) Information disclosure (CVE-ID: CVE-2024-45332)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to shared microarchitectural predictor state that influences transient execution. A local user can gain access to sensitive information.

Remediation

Install update from vendor's website.

References

• https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01247.html
• http://www.openwall.com/lists/oss-security/2025/05/13/7
• https://comsec.ethz.ch/research/microarch/branch-privilege-injection/