{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-53091",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-53091"
  ],
  "published": "2024-11-21T18:16:59Z",
  "summary": "bpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rx",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rx\n\nAs the introduction of the support for vsock and unix sockets in sockmap,\ntls_sw_has_ctx_tx/rx cannot presume the socket passed in must be IS_ICSK.\nvsock and af_unix sockets have vsock_sock and unix_sock instead of\ninet_connection_sock. For these sockets, tls_get_ctx may return an invalid\npointer and cause page fault in function tls_sw_ctx_rx.\n\nBUG: unable to handle page fault for address: 0000000000040030\nWorkqueue: vsock-loopback vsock_loopback_work\nRIP: 0010:sk_psock_strp_data_ready+0x23/0x60\nCall Trace:\n ? __die+0x81/0xc3\n ? no_context+0x194/0x350\n ? do_page_fault+0x30/0x110\n ? async_page_fault+0x3e/0x50\n ? sk_psock_strp_data_ready+0x23/0x60\n virtio_transport_recv_pkt+0x750/0x800\n ? update_load_avg+0x7e/0x620\n vsock_loopback_work+0xd0/0x100\n process_one_work+0x1a7/0x360\n worker_thread+0x30/0x390\n ? create_worker+0x1a0/0x1a0\n kthread+0x112/0x130\n ? __kthread_cancel_work+0x40/0x40\n ret_from_fork+0x1f/0x40\n\nv2:\n  - Add IS_ICSK check\nv3:\n  - Update the commits in Fixes",
  "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-2024-53091"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a078a480ff3f43d74d8a024ae10c3c7daf6db149"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6781cfa93a6a1b7f5be6819a5a2dd8f30f47ca26"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/44d0469f79bd3d0b3433732877358df7dc6b17b1"
    }
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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 vulnerable code is reached only through local IPC \u2014 data arriving on an AF_UNIX stream socket or an AF_VSOCK socket that has been placed in a BPF sockmap \u2014 and the sockmap/SK_SKB setup requires local bpf() syscalls. Despite living in include/net/tls.h, no TLS/kTLS network peer is involved; the helper is simply misapplied to non-inet sockets.\nAC:L - The attacker deterministically controls both the configuration (sockmap with stream_parser+stream_verdict, or the sk_skb_adjust_room helper) and the trigger (writing to the socket); no race and no uncontrolled memory layout is required. The confused offset is fixed and the fault reproduces reliably, as shown by the reporter's vsock-loopback repro.\nPR:L - In the intended deployment for this feature \u2014 sockmap acceleration of AF_UNIX/vsock IPC set up by a privileged agent \u2014 an ordinary unprivileged local process triggers the OOB read merely by connecting and writing to the socket, and a guest VM can trigger the identical virtio_transport_recv_pkt path on the host. BPF tokens (6.9+) additionally let container runtimes delegate CAP_BPF/CAP_NET_ADMIN into an unprivileged user namespace, so real init-namespace root is not required.\nUI:N - No victim action is needed; the attacker performs both the sockmap attachment (or relies on an existing legitimate one) and the socket write that drives sk_data_ready into the confused helper.\nS:U - The out-of-bounds read, wild dereference and resulting oops are all confined to the host kernel's own security authority. No IOMMU, hypervisor, or sandbox boundary is crossed by the defect itself.\nC:H - tls_get_ctx() reads 8 bytes at offset 1264 of a 1152-byte unix_sock \u2014 a genuine out-of-bounds read into an adjacent, heap-groomable slab object \u2014 and the resulting value is then dereferenced at +0x30, yielding an arbitrary-address read whose outcome steers control flow as an observable oracle.\nI:H - This is a type confusion (vsock_sock/unix_sock treated as inet_connection_sock), which per scoring guidance carries High integrity impact; concretely, a spuriously \"true\" tls_sw_has_ctx_rx() in sk_skb_adjust_room() writes rxm->full_len += len_diff into the skb control block, corrupting strparser length bookkeeping on a socket that has no TLS context.\nA:H - The demonstrated result is an unhandled kernel page fault (\"BUG: unable to handle page fault for address: 0000000000040030\") inside a workqueue/softirq context, i.e. an oops that panics with panic_on_oops and otherwise kills the worker while holding sk_callback_lock and the socket lock, hanging the subsystem."
    }
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}