CVE WatchJul 30, 2026

CVE-2025-38586

In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix fp initialization for exception boundary In the ARM64

CVSS

7.8

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Aug 19, 2025 · Last modified: Jul 30, 2026 · CWE-476

EPSS · 30d

0.1%EPSS · 30 days0.2%

2026-07-042026-08-01

Technical description

In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix fp initialization for exception boundary In the ARM64 BPF JIT when prog->aux->exception_boundary is set for a BPF program, find_used_callee_regs() is not called because for a program acting as exception boundary, all callee saved registers are saved. find_used_callee_regs() sets `ctx->fp_used = true;` when it sees FP being used in any of the instructions. For programs acting as exception boundary, ctx->fp_used remains false even if frame pointer is used by the program and therefore, FP is not set-up for such programs in the prologue. This can cause the kernel to crash due to a pagefault. Fix it by setting ctx->fp_used = true for exception boundary programs as fp is always saved in such programs.

Official references

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