What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-20 · updated 2026-06-17

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.

Affected products

• Debian Linux: 11.0
• Linux kernel: before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.139; from 6.2 before 6.6.91; from 6.7 before 6.12.29; from 6.13 before 6.14.7 — fixed in 5.10.239, 5.15.186, 6.1.139, 6.12.29, 6.14.7, 6.6.91

How to fix

Upgrade to a fixed version: Linux kernel 5.10.239, 5.15.186, 6.1.139, 6.12.29. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0dfefc2ea2f29ced2416017d7e5b1253a54c2735
• https://git.kernel.org/stable/c/38c345fd54afd9d6ed8d3fcddf3f6ea23887bf78
• https://git.kernel.org/stable/c/42a20cf51011788f04cf2adbcd7681f02bdb6c27
• https://git.kernel.org/stable/c/852b8ae934b5cbdc62496fa56ce9969aa2edda7f
• https://git.kernel.org/stable/c/8fe5c37b0e08a97cf0210bb75970e945aaaeebab
• https://git.kernel.org/stable/c/993f63239c219696aef8887a4e7d3a16bf5a8ece
• https://git.kernel.org/stable/c/c6a8735d841bcb7649734bb3a787bb174c67c0d8
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

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