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CVE-2026-52910 is a Linux kernel memory-safety vulnerability in BPF/reuseport handling. When a UDP reuseport group has an attached classic BPF (cBPF) reuseport program and that program is replaced or detached via the setsockopt() path (including reuseport_attach_prog() or reuseport_detach_prog()), the kernel may free the detached reuseport cBPF program immediately through sk_reuseport_prog_free(), bpf_release_orig_filter(), and bpf_prog_free() without waiting for an RCU grace period. Concurrent packet-processing paths, including reuseport_select_sock() during UDP socket selection, may still access the program as RCU readers. This creates a race condition leading to use-after-free behavior and observed vmalloc out-of-bounds reads in reuseport_select_sock(). The upstream fix defers freeing the reuseport cBPF program until after one RCU grace period.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
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Cross-references every affected SKU, including bundled OEM variants.
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