CVE-2025-38339

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

powerpc/bpf: fix JIT code size calculation of bpf trampoline

arch_bpf_trampoline_size() provides JIT size of the BPF trampoline

before the buffer for JIT'ing it is allocated. The total number of

instructions emitted for BPF trampoline JIT code depends on where

the final image is located. So, the size arrived at with the dummy

pass in arch_bpf_trampoline_size() can vary from the actual size

needed in arch_prepare_bpf_trampoline(). When the instructions

accounted in arch_bpf_trampoline_size() is less than the number of

instructions emitted during the actual JIT compile of the trampoline,

the below warning is produced:

WARNING: CPU: 8 PID: 204190 at arch/powerpc/net/bpf_jit_comp.c:981 __arch_prepare_bpf_trampoline.isra.0+0xd2c/0xdcc

which is:

/* Make sure the trampoline generation logic doesn't overflow */

if (image && WARN_ON_ONCE(&image[ctx->idx] >

(u32 *)rw_image_end - BPF_INSN_SAFETY)) {

So, during

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References