CVE-2025-38586

bpf, arm64: Fix fp initialization for exception boundary

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321
https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422
https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adce
https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35

Frequently Asked Questions

What is the severity of CVE-2025-38586?: CVE-2025-38586 has not yet been assigned a CVSS score.
How to fix CVE-2025-38586?: To fix CVE-2025-38586, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38586 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38586 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38586?: CVE-2025-38586 affects Linux Linux, Linux Linux.

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