{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-57802",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-57802"
  ],
  "published": "2025-01-15T13:11:32Z",
  "summary": "netrom: check buffer length before accessing it",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: check buffer length before accessing it\n\nSyzkaller reports an uninit value read from ax25cmp when sending raw message\nthrough ieee802154 implementation.\n\n=====================================================\nBUG: KMSAN: uninit-value in ax25cmp+0x3a5/0x460 net/ax25/ax25_addr.c:119\n ax25cmp+0x3a5/0x460 net/ax25/ax25_addr.c:119\n nr_dev_get+0x20e/0x450 net/netrom/nr_route.c:601\n nr_route_frame+0x1a2/0xfc0 net/netrom/nr_route.c:774\n nr_xmit+0x5a/0x1c0 net/netrom/nr_dev.c:144\n __netdev_start_xmit include/linux/netdevice.h:4940 [inline]\n netdev_start_xmit include/linux/netdevice.h:4954 [inline]\n xmit_one net/core/dev.c:3548 [inline]\n dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564\n __dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349\n dev_queue_xmit include/linux/netdevice.h:3134 [inline]\n raw_sendmsg+0x654/0xc10 net/ieee802154/socket.c:299\n ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\n __sys_sendmsg net/socket.c:2667 [inline]\n __do_sys_sendmsg net/socket.c:2676 [inline]\n __se_sys_sendmsg net/socket.c:2674 [inline]\n __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\n slab_alloc_node mm/slub.c:3478 [inline]\n kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\n kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\n __alloc_skb+0x318/0x740 net/core/skbuff.c:651\n alloc_skb include/linux/skbuff.h:1286 [inline]\n alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\n sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2780\n sock_alloc_send_skb include/net/sock.h:1884 [inline]\n raw_sendmsg+0x36d/0xc10 net/ieee802154/socket.c:282\n ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\n __sys_sendmsg net/socket.c:2667 [inline]\n __do_sys_sendmsg net/socket.c:2676 [inline]\n __se_sys_sendmsg net/socket.c:2674 [inline]\n __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nCPU: 0 PID: 5037 Comm: syz-executor166 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\n=====================================================\n\nThis issue occurs because the skb buffer is too small, and it's actual\nallocation is aligned. This hides an actual issue, which is that nr_route_frame\ndoes not validate the buffer size before using it.\n\nFix this issue by checking skb->len before accessing any fields in skb->data.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-57802"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64e9f54a14f2887be8634fb85cd2f13bec18a184"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf6befa7c569787f53440274bbed1405fc07738d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/769e36c2119a51070faf58819c58274f57a088db"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/78a110332ae268d0b005247c3b9a7d703b875c49"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f647d72245aadce30618f4c8fd3803904418dbec"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ba7f80d98d4965349cfcd258dd78418496c1625"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a4fd163aed2edd967a244499754dec991d8b4c7d"
    }
  ],
  "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": 9.4,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable code is the NET/ROM layer-3 routing handler invoked directly on frames received from remote peers over AX.25 (net/netrom/af_netrom.c:1382); NET/ROM is a routed, multi-hop protocol with its own TTL, so the attacker need not be on the victim's physical link, and NET/ROM nodes are routinely interconnected over the Internet via AX.25-over-IP encapsulation feeding the kernel through KISS interfaces.\nAC:L - The attacker simply completes the unauthenticated AX.25 SABM/UA handshake to the netrom callsign and sends one I-frame with PID 0xCF carrying fewer than 15 payload bytes; the out-of-range access is deterministic and requires no race, no memory-layout grooming, and no victim state the attacker cannot create.\nPR:N - AX.25 and NET/ROM perform no authentication whatsoever \u2014 ax25_rcv() creates an ax25_cb for the registered netrom callsign with no socket and no credentials (net/ax25/ax25_in.c:364), so any peer able to put frames on the link reaches nr_route_frame().\nUI:N - The frame is processed in softirq context by the receive path as soon as it arrives; no local user action of any kind is required on the target.\nS:U - The uninitialized read, the routing-table pollution and the resulting disclosure all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Up to ~28 bytes of uninitialized/stale kernel heap per frame are consumed as callsigns and copied into the NET/ROM node and neighbour tables exposed through world-readable /proc/net/nr_nodes and /proc/net/nr_neigh, into socket state returned by accept()/getsockname(), and into transmitted reply frames built by __nr_transmit_reply(); the attacker can repeat this arbitrarily to sample kernel memory, so this is not a strictly bounded few-byte leak.\nI:L - Kernel state is modified from uninitialized memory \u2014 routing nodes and neighbour entries are created from garbage callsigns via nr_add_node(), nr_make->user_addr is populated with stale heap data, and skb->data[14]-- writes a byte beyond the frame's valid data \u2014 but there is no attacker-controlled out-of-bounds write or code-execution primitive.\nA:H - The condition was reported as a fatal KMSAN BUG, so on KASAN/KMSAN or panic_on_warn kernels the access aborts the machine; additionally, unauthenticated malformed frames drive uncontrolled routing behaviour \u2014 unbounded node/neighbour insertion from random callsigns and forwarding decisions on a TTL byte that is never actually decremented on the wire \u2014 allowing a remote attacker to degrade or deny the affected node's networking at will."
    }
  }
}