CVE-2025-38280

/// Technical description

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

bpf: Avoid __bpf_prog_ret0_warn when jit fails

syzkaller reported an issue:

WARNING: CPU: 3 PID: 217 at kernel/bpf/core.c:2357 __bpf_prog_ret0_warn+0xa/0x20 kernel/bpf/core.c:2357

Modules linked in:

CPU: 3 UID: 0 PID: 217 Comm: kworker/u32:6 Not tainted 6.15.0-rc4-syzkaller-00040-g8bac8898fe39

RIP: 0010:__bpf_prog_ret0_warn+0xa/0x20 kernel/bpf/core.c:2357

Call Trace:

<TASK>

bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]

__bpf_prog_run include/linux/filter.h:718 [inline]

bpf_prog_run include/linux/filter.h:725 [inline]

cls_bpf_classify+0x74a/0x1110 net/sched/cls_bpf.c:105

...

When creating bpf program, 'fp->jit_requested' depends on bpf_jit_enable.

This issue is triggered because of CONFIG_BPF_JIT_ALWAYS_ON is not set

and bpf_jit_enable is set to 1, causing the arch to attempt JIT the prog,

but jit failed due to FAULT_INJECTION. As a result, incorrectly

treats the program as valid, when the program

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References