CVE-2024-44945

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Per kernel scoring guidance netfilter/nfnetlink netlink paths are Local.\nAC:L - The attacker fully controls every precondition: it enables `NETLINK_EXT_ACK` on its own socket and sends a well-formed `BATCH_BEGIN|NLM_F_ACK` + `BATCH_END` batch, which deterministically reaches `nfnl_err_add()` with the uninitialized `extack` and delivers it. Stack contents at that frame offset can be groomed by preceding syscalls, so no condition lies outside the attacker's influence.\nPR:L - `nfnetlink_rcv()` requires `CAP_NET_ADMIN` only via `netlink_net_capable()`, which is evaluated against the netns owner's user namespace, so any unprivileged user obtains it with `unshare -Urn`. The nf_tables subsystem is module-autoloaded on demand from that namespace.\nUI:N - The attacker triggers the entire sequence from its own process with socket/sendmsg calls; no victim action or cooperation is involved.\nS:U - The uninitialized read and the resulting disclosure/crash occur entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - `netlink_ack_tlv_fill()` does `nla_put_string(skb, NLMSGERR_ATTR_MSG, extack->_msg)` on an uninitialized pointer, copying kernel memory at an attacker-groomable address straight back to userspace, and the uninitialized `cookie_len` (up to 255 vs. a 20-byte array) additionally leaks ~130 bytes past the `nfnl_err` slab object. This is an attacker-directed kernel memory read primitive, defeating KASLR and exposing arbitrary kernel data.\nI:N - The defect is a pure use of uninitialized memory \u2014 every affected field is only read and serialized into a freshly allocated reply skb, whose `nla_put` calls are tailroom-checked. No kernel memory is written or corrupted, so no modification primitive arises.\nA:H - `strlen()` on the uninitialized `_msg` pointer dereferences a wild address, producing a page-fault oops, and the out-of-bounds `cookie_len` read triggers a KASAN slab-out-of-bounds report (panic with panic_on_warn/KASAN panic). 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{}