{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56606",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56606"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "af_packet: avoid erroring out after sock_init_data() in packet_create()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_packet: avoid erroring out after sock_init_data() in packet_create()\n\nAfter sock_init_data() the allocated sk object is attached to the provided\nsock object. On error, packet_create() frees the sk object leaving the\ndangling pointer in the sock object on return. Some other code may try\nto use this pointer and cause use-after-free.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56606"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/71b22837a5e55ac27d6a14b9cdf2326587405c4f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1dc1e1db927056cb323296e2294a855cd003dfe7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/132e615bb1d7cdec2d3cfbdec2efa630e923fd21"
    },
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      "url": "https://git.kernel.org/stable/c/a6cf750b737374454a4e03a5ed449a3eb0c96414"
    },
    {
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      "url": "https://git.kernel.org/stable/c/157f08db94123e2ba56877dd0ac88908b13a5dd0"
    },
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      "url": "https://git.kernel.org/stable/c/fd09880b16d33aa5a7420578e01cd79148fa9829"
    },
    {
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      "url": "https://git.kernel.org/stable/c/46f2a11cb82b657fd15bab1c47821b635e03838b"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached purely through the local `socket(AF_PACKET, ...)` syscall path (`__sys_socket` \u2192 `__sock_create` \u2192 `packet_create`); no network packet or remote peer is involved in triggering it.\nAC:L - The attacker controls both preconditions \u2014 they can exhaust percpu/slab memory themselves (mass socket and BPF-map allocation, netns churn) and retry the cheap `socket()` call in an unbounded loop until `alloc_percpu()` fails, and can heap-spray the generic kmalloc cache to reclaim the freed `packet_sock`.\nPR:L - The only gate is `ns_capable(net->user_ns, CAP_NET_RAW)` at af_packet.c:3394, which any unprivileged user satisfies inside a user+network namespace (`unshare -Urn`), and which containers hold by default.\nUI:N - The attacker triggers the entire sequence from their own process via repeated `socket()` calls; no action by any other user or administrator is required.\nS:U - The dangling pointer, the freed object, and the resulting corruption are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free reads freed slab memory (`atomic64_read(&sk->sk_cookie)` in `__sock_gen_cookie()`), and since `packet_sock` comes from a generic kmalloc cache the attacker can reclaim the object with sprayed content, turning this into a controllable kernel memory disclosure primitive.\nI:H - `__sock_gen_cookie()` performs an `atomic64_cmpxchg()` on the freed object \u2014 an 8-byte write into attacker-reclaimed slab memory at a controlled offset, which is a classic stepping stone to control-flow hijack and privilege escalation.\nA:H - Dereferencing the dangling `sock->sk` after `sk_free()` corrupts freed slab memory and reliably produces a KASAN splat, oops, or panic, as shown in the reference report for this bug class."
    }
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}