{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52975",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-52975"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "bonding: 3ad: implement proper RCU rules for port->aggregator",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: 3ad: implement proper RCU rules for port->aggregator\n\nsyzbot found a data-race in bond_3ad_get_active_agg_info /\nbond_3ad_state_machine_handler [1] which hints at lack of proper\nRCU implementation.\n\nAdd __rcu qualifier to port->aggregator, and add proper RCU API.\n\n[1]\n\nBUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler\n\nwrite to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0:\n  ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline]\n  bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569\n  process_one_work kernel/workqueue.c:3302 [inline]\n  process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385\n  worker_thread+0x58a/0x780 kernel/workqueue.c:3466\n  kthread+0x22a/0x280 kernel/kthread.c:436\n  ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n\nread to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1:\n  __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline]\n  bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881\n  bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853\n  rtnl_link_info_fill net/core/rtnetlink.c:906 [inline]\n  rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927\n  rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168\n  rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453\n  rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline]\n  rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495\n  __dev_notify_flags+0x76/0x390 net/core/dev.c:9790\n  netif_change_flags+0xac/0xd0 net/core/dev.c:9823\n  do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180\n  rtnl_group_changelink net/core/rtnetlink.c:3813 [inline]\n  __rtnl_newlink net/core/rtnetlink.c:3981 [inline]\n  rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109\n  rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995\n  netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550\n  rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022\n  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n  netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344\n  netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894\n  sock_sendmsg_nosec net/socket.c:787 [inline]\n  __sock_sendmsg net/socket.c:802 [inline]\n  ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698\n  ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752\n  __sys_sendmsg net/socket.c:2784 [inline]\n  __do_sys_sendmsg net/socket.c:2789 [inline]\n  __se_sys_sendmsg net/socket.c:2787 [inline]\n  __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787\n  x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n  do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x0000000000000000 -> 0xffff88813cf5c400\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G        W           syzkaller #0 PREEMPT(full)\nTainted: [W]=WARN\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026",
  "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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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b7265b3a82f40d2357c4004b26eb794a095b186"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5fb9ea4e8ebf514d92df2b6c9d0db25ba02ac735"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c169c5837525ad842df6a542facf52b6f866a519"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c4f050ce06c56cfb5993268af4a5cb66ed1cd04e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable paths are local bonding control/information paths such as rtnetlink, sysfs, and procfs racing with the 802.3ad workqueue. A remote packet alone is not sufficient for the complete race; a local attacker can exercise the reader and drive bond state changes.\nAC:L - A local attacker can create/configure an 802.3ad bond in a user/network namespace and repeatedly issue concurrent link queries while the bond workqueue updates port->aggregator. The race is attacker-influenced and does not depend on rare conditions outside the attacker's control.\nPR:L - Bond creation and many control operations require CAP_NET_ADMIN, but that is reachable by an unprivileged user inside a user namespace. RTM_GETLINK-style readers are even less restricted, but exploitation still assumes a local unprivileged user context.\nUI:N - No victim action is required once the attacker can run local commands or netlink requests. The attacker can trigger the relevant reader and writer activity directly.\nS:U - The impact remains within the kernel and the host networking subsystem security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is an RCU lifetime violation on port->aggregator, which points into per-slave ad_slave_info memory that can be cleared, freed, or reused. Treating the stale-pointer/UAF condition conservatively, it can expose kernel memory through groomed object reuse.\nI:H - A stale kernel pointer/UAF in attacker-controllable bonding state is a memory-safety issue that can plausibly be heap-groomed beyond a simple crash. Under the required overestimation rule, this supports high integrity impact.\nA:H - At minimum, racing dereferences of port->aggregator can lead to invalid pointer dereferences, inconsistent list traversal, oops, or panic. The vulnerability is therefore capable of causing a kernel-level denial of service."
    }
  }
}