{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56720",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56720"
  ],
  "published": "2024-12-29T11:31:32Z",
  "summary": "bpf, sockmap: Several fixes to bpf_msg_pop_data",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Several fixes to bpf_msg_pop_data\n\nSeveral fixes to bpf_msg_pop_data,\n1. In sk_msg_shift_left, we should put_page\n2. if (len == 0), return early is better\n3. pop the entire sk_msg (last == msg->sg.size) should be supported\n4. Fix for the value of variable \"a\"\n5. In sk_msg_shift_left, after shifting, i has already pointed to the next\nelement. Addtional sk_msg_iter_var_next may result in BUG.",
  "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-2024-56720"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a"
    }
  ],
  "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 vulnerable helper runs from `sk_psock_msg_verdict()` on the local egress path, requiring a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap plus a local `sendmsg()` on a sockmap'd socket; there is no remote packet path into `bpf_msg_pop_data()` since SK_MSG programs only process data the local host is sending.\nAC:L - The bug is fully deterministic and entirely attacker-controlled \u2014 the sender chooses the write size that splits the message across scatterlist elements (making `offset != 0`), and the BPF program chooses a `start` that lands in a later element, so `a = start` is guaranteed to exceed `sge->length` with no race, timing, or memory-layout dependency.\nPR:L - Setting up the sockmap and SK_MSG program requires CAP_BPF and CAP_NET_ADMIN, but `bpf_token_capable()` grants these at `ns_capable()` level inside a user namespace via delegated BPF tokens, and both capabilities are routinely handed to container workloads, so an ordinary unprivileged-in-init-ns user can reach this path.\nUI:N - No victim action is required \u2014 the attacker loads the SK_MSG program and issues the triggering `sendmsg()` entirely on their own, with no file to open, filesystem to mount, or third party to interact with.\nS:U - The out-of-bounds reads, heap overflow, and scatterlist-ring corruption are all confined to the kernel's own memory and the socket's psock state; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The corrupted scatterlist entry carries an inflated `length` (up to ~4 GB after the signed-to-unsigned wrap of `b`) and an `offset` past the page, and `tcp_bpf_push()` hands those verbatim to `tcp_sendmsg_locked()` with MSG_SPLICE_PAGES, transmitting arbitrary adjacent kernel heap memory to the socket peer; the `!space` path additionally performs `memcpy(to, from, a)` reading far past the source element.\nI:H - In the no-space branch `memcpy(to, from, a)` and `memcpy(to + a, from + a + pop, b)` write attacker-sized data past an undersized `alloc_pages()` allocation \u2014 a controlled heap buffer overflow \u2014 and the missing `put_page()` plus the stray `sk_msg_iter_var_next()` rotate the entire sg ring, installing stale `struct page *` values that produce refcount imbalance and use-after-free of pages.\nA:H - A negative `b` passed to `memcpy()` as `size_t`, a scatterlist entry pointing far outside its page, and `sk_msg_shift_left()` corrupting the whole fragment ring all lead directly to kernel oops/panic, while the missing `put_page()` permanently leaks a page per popped element."
    }
  }
}