CVE-2024-38564 (GCVE-0-2024-38564)

Vulnerability from cvelistv5 – Published: 2024-06-19 13:35 – Updated: 2026-10-27 15:53
VLAI
Title
bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE bpf_prog_attach uses attach_type_to_prog_type to enforce proper attach type for BPF_PROG_TYPE_CGROUP_SKB. link_create uses bpf_prog_get and relies on bpf_prog_attach_check_attach_type to properly verify prog_type <> attach_type association. Add missing attach_type enforcement for the link_create case. Otherwise, it's currently possible to attach cgroup_skb prog types to other cgroup hooks.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-20 14:57 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3505cb9fa26cfec9512744466e754a8cbc2365b0 , < 6675c541f540a29487a802d3135280b69b9f568d (git)
Affected: 3505cb9fa26cfec9512744466e754a8cbc2365b0 , < 67929e973f5a347f05fef064fea4ae79e7cdb5fd (git)
Affected: 3505cb9fa26cfec9512744466e754a8cbc2365b0 , < b34bbc76651065a5eafad8ddff1eb8d1f8473172 (git)
Affected: 3505cb9fa26cfec9512744466e754a8cbc2365b0 , < 543576ec15b17c0c93301ac8297333c7b6e84ac7 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.33 , ≤ 6.6.* (semver)
Unaffected: 6.8.12 , ≤ 6.8.* (semver)
Unaffected: 6.9.3 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "current_release_date": "2026-11-06T14:15:28+00:00",
      "cve": "CVE-2024-38564",
      "id": "CVE-2024-38564",
      "initial_release_date": "2024-06-19T00:00:00+00:00",
      "product_status:fixed": "1206",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "18",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-38564.json",
      "version": "3"
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              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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                "url": "https://git.kernel.org/stable/c/6675c541f540a29487a802d3135280b69b9f568d"
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                    "timestamp": "2024-06-20T14:57:28.333210Z",
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            "title": "CISA ADP Vulnrichment"
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              "product": "Linux",
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              "versions": [
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                  "versionType": "semver"
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                  "version": "6.9.3",
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                  "status": "unaffected",
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                      "vulnerable": true
                    },
                    {
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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 \u003c\u003e attach_type association.\n\nAdd missing attach_type enforcement for the link_create case.\nOtherwise, it\u0027s 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 \u2014 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-\u003euserns, CAP_NET_ADMIN)` \u2014 i.e. reachable by container-root inside a BPF-token-delegated user namespace, an unprivileged principal from the host\u0027s 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 \u2014 a standard local privilege escalation with no VM, IOMMU, or sandbox boundary crossed.\nC:H - sk_buff-offset loads against a 12\u201356 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-\u003emark`, `-\u003epriority` and `-\u003ecb[0..4]`, which compile to raw stores ~0x30\u20130xa8 bytes past the small stack ctx, giving attacker-controlled out-of-bounds kernel stack writes into caller frames \u2014 a control-flow hijack primitive.\nA:H - The wild-pointer dereferences and stack corruption reliably produce a general protection fault, KASAN splat, or panic \u2014 this is exactly how syzbot (`syzbot+838346b979830606c854`) surfaced the bug."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-38564",
        "datePublished": "2024-06-19T13:35:32.222Z",
        "dateReserved": "2024-06-18T19:36:34.922Z",
        "dateUpdated": "2026-10-27T15:53:48.399Z",
        "state": "PUBLISHED"
      },
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  }
}



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