Bug 2419863 (CVE-2025-40319)

Summary: CVE-2025-40319 kernel: bpf: Sync pending IRQ work before freeing ring buffer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-08 07:04:22 UTC 
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.
Comment 1 Alexander B 2025-12-10 09:29:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120823-CVE-2025-40319-9a46@gregkh/T