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CVE-2024-38564 is an input-validation vulnerability in the Linux kernel's BPF link-creation handling. The bpf_prog_attach path uses attach_type_to_prog_type to enforce valid attachment types for BPF_PROG_TYPE_CGROUP_SKB programs. In contrast, link_create obtains the program through bpf_prog_get and relies on bpf_prog_attach_check_attach_type, which lacks the necessary enforcement for this program type. Consequently, BPF_LINK_CREATE can attach cgroup_skb programs to other cgroup hooks that are not valid for their program type.
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A Linux kernel BPF vulnerability caused by missing attach-type enforcement in BPF_LINK_CREATE permits BPF_PROG_TYPE_CGROUP_SKB programs to attach to inappropriate cgroup hooks. The advisory rates it Medium, with a CVSS v3 score of 5.5 indicating local, low-privilege exploitation and high availability impact. The prescribed fix is to update the Echo linux package and related packages to version 6.8.12-1 or later.
Linux kernel BPF link-creation authorization issue addressed by enforcing the BPF_PROG_TYPE_CGROUP_SKB attach type.
A Linux kernel BPF validation flaw involving enforcement of BPF_PROG_TYPE_CGROUP_SKB attachment types in BPF_LINK_CREATE.
Linux kernel BPF flaw involving missing enforcement of BPF_PROG_TYPE_CGROUP_SKB attach type in BPF_LINK_CREATE.
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Cross-references every affected SKU, including bundled OEM variants.
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