{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38564", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-18T19:36:34.922Z", "datePublished": "2024-06-19T13:35:32.222Z", "dateUpdated": "2026-08-05T11:32:48.278Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:48.278Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/syscall.c" ], "versions": [ { "version": "4a1e7c0c63e02daad751842b7880f9bbcdfb6e89", "lessThan": "6675c541f540a29487a802d3135280b69b9f568d", "status": "affected", "versionType": "git" }, { "version": "4a1e7c0c63e02daad751842b7880f9bbcdfb6e89", "lessThan": "67929e973f5a347f05fef064fea4ae79e7cdb5fd", "status": "affected", "versionType": "git" }, { "version": "4a1e7c0c63e02daad751842b7880f9bbcdfb6e89", "lessThan": "b34bbc76651065a5eafad8ddff1eb8d1f8473172", "status": "affected", "versionType": "git" }, { "version": "4a1e7c0c63e02daad751842b7880f9bbcdfb6e89", "lessThan": "543576ec15b17c0c93301ac8297333c7b6e84ac7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/syscall.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.12", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.3", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.8.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.9.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6675c541f540a29487a802d3135280b69b9f568d" }, { "url": "https://git.kernel.org/stable/c/67929e973f5a347f05fef064fea4ae79e7cdb5fd" }, { "url": "https://git.kernel.org/stable/c/b34bbc76651065a5eafad8ddff1eb8d1f8473172" }, { "url": "https://git.kernel.org/stable/c/543576ec15b17c0c93301ac8297333c7b6e84ac7" } ], "title": "bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-20T14:57:28.333210Z", "id": "CVE-2024-38564", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-20T14:57:37.182Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:12:25.836Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/6675c541f540a29487a802d3135280b69b9f568d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/67929e973f5a347f05fef064fea4ae79e7cdb5fd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b34bbc76651065a5eafad8ddff1eb8d1f8473172", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/543576ec15b17c0c93301ac8297333c7b6e84ac7", "tags": [ "x_transferred" ] } ] } ] } }