Bug 2367566 (CVE-2025-37948)

Summary: CVE-2025-37948 kernel: arm64: bpf: Add BHB mitigation to the epilogue for cBPF programs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-20 17:01:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

arm64: bpf: Add BHB mitigation to the epilogue for cBPF programs

A malicious BPF program may manipulate the branch history to influence
what the hardware speculates will happen next.

On exit from a BPF program, emit the BHB mititgation sequence.

This is only applied for 'classic' cBPF programs that are loaded by
seccomp.
Comment 1 Jon Moroney 2025-05-21 00:44:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052000-CVE-2025-37948-2f8d@gregkh/T