PT-2025-3308 · Linux+3 · Linux Kernel+3

Published 2024-11-13 · Updated 2025-10-03 · CVE-2024-56761

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue involves an indirect branch instruction setting the CPU indirect branch tracker (IBT) into WAIT FOR ENDBRANCH (WFE) state, which stays asserted across the instruction boundary. When the decoder finds an inappropriate instruction while WFE is set, the CPU raises a #CP fault. This can lead to a dead loop if not properly cleared. The problem is specific to FRED, which provides space on the entry stack to save and restore the WFE state, thus requiring software to clear it. Clobbering WFE in any other circumstance is a security-relevant bug.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

ALSA-2025_12746

ALSA-2025_12752

ALSA-2025_12753

ALSA-2025_16880

ALT-PU-2025-1256

ALT-PU-2025-12647

ALT-PU-2025-1925

ALT-PU-2025-3483

AZL-55029

BDU:2025-07840

CVE-2024-56761

USN-7379-1

USN-7379-2

USN-7380-1

USN-7381-1

USN-7382-1

USN-7513-1

USN-7513-2

USN-7513-3

USN-7513-4

USN-7513-5

USN-7514-1

USN-7515-1

USN-7515-2

USN-7522-1

USN-7523-1

USN-7524-1

Affected Products

Alt Linux

Linuxmint

Linux Kernel

Ubuntu

References · 823

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56761.json · Exploit
• https://ubuntu.com/security/CVE-2024-53166 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56639 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50059 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56602 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56594 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-56761 · Security Note
• https://ubuntu.com/security/CVE-2024-50185 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50249 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50211 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50205 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50151 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-55029 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50145 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-57791 · Vendor Advisory