{
  "cveId": "CVE-2025-68801",
  "url": "https://patchblox.com/security/cve/CVE-2025-68801",
  "summary": "CVE-2025-68801 is fixed in 18 products on 1 platform, first by DEBIAN-CVE-2025-68801, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mlxsw: spectrum_router: Fix neighbour use-after-...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mlxsw: spectrum_router: Fix neighbour use-after-free  We sometimes observe use-after-free when dereferencing a neighbour [1]. The problem seems to be that the driver stores a pointer to the neighbour, but without holding a reference on it. A reference is only taken when the neighbour is used by a nexthop.  Fix by simplifying the reference counting scheme. Always take a reference when storing a neighbour pointer in a neighbour entry. Avoid taking a referencing when the neighbour is used by a nexthop as the neighbour entry associated with the nexthop already holds a reference.  Tested by running the test that uncovered the problem over 300 times. Without this patch the problem was reproduced after a handful of iterations.  [1] BUG: KASAN: slab-use-after-free in mlxsw_sp_neigh_entry_update\u002B0x2d4/0x310 Read of size 8 at addr ffff88817f8e3420 by task ip/3929  CPU: 3 UID: 0 PID: 3929 Comm: ip Not tainted 6.18.0-rc4-virtme-g36b21a067510 #3 PREEMPT(full) Hardware name: Nvidia SN5600/VMOD0013, BIOS 5.13 05/31/2023 Call Trace:  \u003CTASK\u003E  dump_stack_lvl\u002B0x6f/0xa0  print_address_description.constprop.0\u002B0x6e/0x300  print_report\u002B0xfc/0x1fb  kasan_report\u002B0xe4/0x110  mlxsw_sp_neigh_entry_update\u002B0x2d4/0x310  mlxsw_sp_router_rif_gone_sync\u002B0x35f/0x510  mlxsw_sp_rif_destroy\u002B0x1ea/0x730  mlxsw_sp_inetaddr_port_vlan_event\u002B0xa1/0x1b0  __mlxsw_sp_inetaddr_lag_event\u002B0xcc/0x130  __mlxsw_sp_inetaddr_event\u002B0xf5/0x3c0  mlxsw_sp_router_netdevice_event\u002B0x1015/0x1580  notifier_call_chain\u002B0xcc/0x150  call_netdevice_notifiers_info\u002B0x7e/0x100  __netdev_upper_dev_unlink\u002B0x10b/0x210  netdev_upper_dev_unlink\u002B0x79/0xa0  vrf_del_slave\u002B0x18/0x50  do_set_master\u002B0x146/0x7d0  do_setlink.isra.0\u002B0x9a0/0x2880  rtnl_newlink\u002B0x637/0xb20  rtnetlink_rcv_msg\u002B0x6fe/0xb90  netlink_rcv_skb\u002B0x123/0x380  netlink_unicast\u002B0x4a3/0x770  netlink_sendmsg\u002B0x75b/0xc90  __sock_sendmsg\u002B0xbe/0x160  ____sys_sendmsg\u002B0x5b2/0x7d0  ___sys_sendmsg\u002B0xfd/0x180  __sys_sendmsg\u002B0x124/0x1c0  do_syscall_64\u002B0xbb/0xfd0  entry_SYSCALL_64_after_hwframe\u002B0x4b/0x53 [...]  Allocated by task 109:  kasan_save_stack\u002B0x30/0x50  kasan_save_track\u002B0x14/0x30  __kasan_kmalloc\u002B0x7b/0x90  __kmalloc_noprof\u002B0x2c1/0x790  neigh_alloc\u002B0x6af/0x8f0  ___neigh_create\u002B0x63/0xe90  mlxsw_sp_nexthop_neigh_init\u002B0x430/0x7e0  mlxsw_sp_nexthop_type_init\u002B0x212/0x960  mlxsw_sp_nexthop6_group_info_init.constprop.0\u002B0x81f/0x1280  mlxsw_sp_nexthop6_group_get\u002B0x392/0x6a0  mlxsw_sp_fib6_entry_create\u002B0x46a/0xfd0  mlxsw_sp_router_fib6_replace\u002B0x1ed/0x5f0  mlxsw_sp_router_fib6_event_work\u002B0x10a/0x2a0  process_one_work\u002B0xd57/0x1390  worker_thread\u002B0x4d6/0xd40  kthread\u002B0x355/0x5b0  ret_from_fork\u002B0x1d4/0x270  ret_from_fork_asm\u002B0x11/0x20  Freed by task 154:  kasan_save_stack\u002B0x30/0x50  kasan_save_track\u002B0x14/0x30  __kasan_save_free_info\u002B0x3b/0x60  __kasan_slab_free\u002B0x43/0x70  kmem_cache_free_bulk.part.0\u002B0x1eb/0x5e0  kvfree_rcu_bulk\u002B0x1f2/0x260  kfree_rcu_work\u002B0x130/0x1b0  process_one_work\u002B0xd57/0x1390  worker_thread\u002B0x4d6/0xd40  kthread\u002B0x355/0x5b0  ret_from_fork\u002B0x1d4/0x270  ret_from_fork_asm\u002B0x11/0x20  Last potentially related work creation:  kasan_save_stack\u002B0x30/0x50  kasan_record_aux_stack\u002B0x8c/0xa0  kvfree_call_rcu\u002B0x93/0x5b0  mlxsw_sp_router_neigh_event_work\u002B0x67d/0x860  process_one_work\u002B0xd57/0x1390  worker_thread\u002B0x4d6/0xd40  kthread\u002B0x355/0x5b0  ret_from_fork\u002B0x1d4/0x270  ret_from_fork_asm\u002B0x11/0x20",
  "published": "2026-01-13T16:16:02Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00151,
  "epssPercentile": 0.04274,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.26.1",
      "fix": "OPENSUSE-SU-2026:20287-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20287-1",
      "released": "2026-02-27T13:03:55Z"
    },
    {
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      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:20287-1",
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      "released": "2026-02-27T13:03:55Z"
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      "fix": "SUSE-SU-2026:0447-1",
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      "released": "2026-02-11T14:05:07Z"
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      "released": "2026-02-27T11:51:02Z"
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    {
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      "product": "kernel-azure",
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      "fix": "OPENSUSE-SU-2026:20287-1",
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      "released": "2026-02-12T11:26:05Z"
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    {
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      "fix": "SUSE-SU-2026:20599-1",
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      "fix": "SUSE-SU-2026:20599-1",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}