What’s Vulnerable › Vulnerabilities

CVE-2025-40319: bpf: Sync pending IRQ work before freeing ring buffer

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-08 · updated 2026-10-15

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.

Affected products

• Linux kernel: 5.8 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

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

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