CVE-2025-40319
Published Dec 8, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Sync pending IRQ work before freeing ring buffer Fix a race where irq_work can be queued in bpf_ringbuf_commit() but the ring buffer is freed before the work executes. In the syzbot reproducer, a BPF program attached to sched_switch triggers bpf_ringbuf_commit(), queuing an irq_work. If the ring buffer is freed before this work executes, the irq_work thread may accesses freed memory. Calling `irq_work_sync(&rb->work)` ensures that all pending irq_work complete before freeing the buffer.
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References
Other References
https://git.kernel.org/stable/c/10ca3b2eec384628bc9f5d8190aed9427ad2dde6
https://git.kernel.org/stable/c/430e15544f11f8de26b2b5109c7152f71b78295e
https://git.kernel.org/stable/c/47626748a2a00068dbbd5836d19076637b4e235b
https://git.kernel.org/stable/c/4e9077638301816a7d73fa1e1b4c1db4a7e3b59c
https://git.kernel.org/stable/c/6451141103547f4efd774e912418a3b4318046c6
https://git.kernel.org/stable/c/de2ce6b14bc3e565708a39bdba3ef9162aeffc72
https://git.kernel.org/stable/c/e1828c7a8d8135e21ff6adaaa9458c32aae13b11
Frequently Asked Questions
What is CVE-2025-40319? +
In the Linux kernel, the following vulnerability has been resolved:
bpf: Sync pending IRQ work before freeing ring buffer
Fix a race where irq_work can be queued in bpf_ringbuf_commit()
but the ring buffer is freed before the work executes.
In the syzbot reproducer, a BPF program attached to sched_switch
triggers bpf_ringbuf_commit(), queuing an irq_work. If the ring buffer
is freed before this work executes, the irq_work thread may accesses
freed memory.
Calling `irq_work_sync(&rb->work)` ensures that all pending irq_work
complete before freeing the buffer.
How do I check if I'm vulnerable to CVE-2025-40319? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.