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CVE-2024-26737 is a use-after-free vulnerability in Linux kernel BPF timer handling caused by a race between bpf_timer_cancel() and bpf_timer_cancel_and_free(). The cancellation helper may obtain the BPF high-resolution timer pointer under the timer lock and subsequently invoke hrtimer_cancel() after releasing the lock. Concurrently, bpf_timer_cancel_and_free() can detach, cancel, and free that same timer object, leaving bpf_timer_cancel() to dereference freed memory. The fix defers freeing the timer object until after an RCU grace period and adds RCU read-side protection in bpf_timer_cancel() for use from non-RCU critical-section contexts, including sleepable BPF programs.
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Linux kernel BPF timer race condition between cancellation and cancellation/free operations.
Linux kernel BPF race condition between timer cancellation and timer cancellation/free operations.
Linux kernel BPF race condition between timer cancellation and timer cancellation-and-free operations.
Linux kernel BPF race condition between timer cancellation and timer cancellation/free operations.
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Cross-references every affected SKU, including bundled OEM variants.
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