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A denial-of-service vulnerability in the Linux kernel ATM CLIP subsystem allows an infinite recursive call chain in clip_push(). The flaw is triggered when ioctl(ATMARP_MKIP) is invoked more than once on the same virtual circuit. On the first invocation, clip_mkip() assigns clip_push() to the socket's push handler. On a subsequent invocation, that handler is copied into clip_vcc->old_push(). Later, when the socket is closed, vcc_destroy_socket() passes a NULL skb to clip_push(), which then calls clip_vcc->old_push(). Because the handler references loop back into clip_push(), the kernel enters unbounded recursion, exhausting the kernel stack and crashing in net/atm/clip.c. The fix prevents a second ATMARP_MKIP operation by checking whether vcc->user_back has already been allocated for the CLIP state object, and adds lock_sock() to avoid races during the operation.
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A Linux kernel denial-of-service vulnerability in the ATM CLIP module caused by infinite recursion.
A Linux kernel denial-of-service vulnerability in the ATM CLIP module caused by infinite recursion.
A Linux kernel denial-of-service vulnerability in the ATM CLIP module caused by infinite recursion.
A Linux kernel denial-of-service vulnerability in the ATM CLIP module caused by infinite recursion.
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Cross-references every affected SKU, including bundled OEM variants.
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