248 lines
13 KiB
JSON
248 lines
13 KiB
JSON
{
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"cveId": "CVE-2024-38564",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-18T19:36:34.922Z",
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"datePublished": "2024-06-19T13:35:32.222Z",
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"dateUpdated": "2026-10-27T15:53:48.399Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE\n\nbpf_prog_attach uses attach_type_to_prog_type to enforce proper\nattach type for BPF_PROG_TYPE_CGROUP_SKB. link_create uses\nbpf_prog_get and relies on bpf_prog_attach_check_attach_type\nto properly verify prog_type <> attach_type association.\n\nAdd missing attach_type enforcement for the link_create case.\nOtherwise, it's currently possible to attach cgroup_skb prog\ntypes to other cgroup hooks."
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"value": "AV:L - The flaw is reached exclusively through the `bpf(BPF_LINK_CREATE)` syscall and then triggered by an ordinary syscall (e.g. `getsockopt()`) from a process in the target cgroup. Per kernel guidance BPF is Local.\nAC:L - Exploitation is fully deterministic — the attacker authors the cgroup_skb program, chooses the mismatched attach type, picks the target cgroup, and invokes the hook itself; there is no race, no memory-layout dependency, and no special kernel config beyond stock `CONFIG_CGROUP_BPF`.\nPR:L - The attach path requires CAP_NET_ADMIN/CAP_SYS_ADMIN via `bpf_token_capable()`, which on 6.8+ is satisfied by `ns_capable(token->userns, CAP_NET_ADMIN)` — i.e. reachable by container-root inside a BPF-token-delegated user namespace, an unprivileged principal from the host's perspective, matching the PR:L treatment of other BPF-capability-gated kernel.org CVEs.\nUI:N - The attacker attaches the link and then triggers the confused hook from its own process; no action by any other user is required.\nS:U - The type confusion corrupts kernel memory within the same kernel security authority — a standard local privilege escalation with no VM, IOMMU, or sandbox boundary crossed.\nC:H - sk_buff-offset loads against a 12–56 byte stack ctx read kernel stack memory out of bounds, and skb helpers such as `bpf_skb_load_bytes()` dereference wild pointers harvested from that memory, yielding effectively arbitrary kernel memory disclosure exfiltrated through BPF maps.\nI:H - `cg_skb_is_valid_access` permits writes to `__sk_buff->mark`, `->priority` and `->cb[0..4]`, which compile to raw stores ~0x30–0xa8 bytes past the small stack ctx, giving attacker-controlled out-of-bounds kernel stack writes into caller frames — a control-flow hijack primitive.\nA:H - The wild-pointer dereferences and stack corruption reliably produce a general protection fault, KASAN splat, or panic — this is exactly how syzbot (`syzbot+838346b979830606c854`) surfaced the bug."
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}
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}
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