{
  "cveId": "CVE-2025-68751",
  "url": "https://patchblox.com/security/cve/CVE-2025-68751",
  "summary": "CVE-2025-68751 is fixed in linux on 1 platform by DEBIAN-CVE-2025-68751 (version 6.17.13-1), released January 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  s390/fpu: Fix false-positive kmsan report in fpu...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  s390/fpu: Fix false-positive kmsan report in fpu_vstl()  A false-positive kmsan report is detected when running ping command.  An inline assembly instruction \u0027vstl\u0027 can write varied amount of bytes depending on value of \u0027index\u0027 argument. If \u0027index\u0027 \u003E 0, \u0027vstl\u0027 writes at least 2 bytes.  clang generates kmsan write helper call depending on inline assembly constraints. Constraints are evaluated compile-time, but value of \u0027index\u0027 argument is known only at runtime.  clang currently generates call to __msan_instrument_asm_store with 1 byte as size. Manually call kmsan function to indicate correct amount of bytes written and fix false-positive report.  This change fixes following kmsan reports:  [   36.563119] ===================================================== [   36.563594] BUG: KMSAN: uninit-value in virtqueue_add\u002B0x35c6/0x7c70 [   36.563852]  virtqueue_add\u002B0x35c6/0x7c70 [   36.564016]  virtqueue_add_outbuf\u002B0xa0/0xb0 [   36.564266]  start_xmit\u002B0x288c/0x4a20 [   36.564460]  dev_hard_start_xmit\u002B0x302/0x900 [   36.564649]  sch_direct_xmit\u002B0x340/0xea0 [   36.564894]  __dev_queue_xmit\u002B0x2e94/0x59b0 [   36.565058]  neigh_resolve_output\u002B0x936/0xb40 [   36.565278]  __neigh_update\u002B0x2f66/0x3a60 [   36.565499]  neigh_update\u002B0x52/0x60 [   36.565683]  arp_process\u002B0x1588/0x2de0 [   36.565916]  NF_HOOK\u002B0x1da/0x240 [   36.566087]  arp_rcv\u002B0x3e4/0x6e0 [   36.566306]  __netif_receive_skb_list_core\u002B0x1374/0x15a0 [   36.566527]  netif_receive_skb_list_internal\u002B0x1116/0x17d0 [   36.566710]  napi_complete_done\u002B0x376/0x740 [   36.566918]  virtnet_poll\u002B0x1bae/0x2910 [   36.567130]  __napi_poll\u002B0xf4/0x830 [   36.567294]  net_rx_action\u002B0x97c/0x1ed0 [   36.567556]  handle_softirqs\u002B0x306/0xe10 [   36.567731]  irq_exit_rcu\u002B0x14c/0x2e0 [   36.567910]  do_io_irq\u002B0xd4/0x120 [   36.568139]  io_int_handler\u002B0xc2/0xe8 [   36.568299]  arch_cpu_idle\u002B0xb0/0xc0 [   36.568540]  arch_cpu_idle\u002B0x76/0xc0 [   36.568726]  default_idle_call\u002B0x40/0x70 [   36.568953]  do_idle\u002B0x1d6/0x390 [   36.569486]  cpu_startup_entry\u002B0x9a/0xb0 [   36.569745]  rest_init\u002B0x1ea/0x290 [   36.570029]  start_kernel\u002B0x95e/0xb90 [   36.570348]  startup_continue\u002B0x2e/0x40 [   36.570703] [   36.570798] Uninit was created at: [   36.571002]  kmem_cache_alloc_node_noprof\u002B0x9e8/0x10e0 [   36.571261]  kmalloc_reserve\u002B0x12a/0x470 [   36.571553]  __alloc_skb\u002B0x310/0x860 [   36.571844]  __ip_append_data\u002B0x483e/0x6a30 [   36.572170]  ip_append_data\u002B0x11c/0x1e0 [   36.572477]  raw_sendmsg\u002B0x1c8c/0x2180 [   36.572818]  inet_sendmsg\u002B0xe6/0x190 [   36.573142]  __sys_sendto\u002B0x55e/0x8e0 [   36.573392]  __s390x_sys_socketcall\u002B0x19ae/0x2ba0 [   36.573571]  __do_syscall\u002B0x12e/0x240 [   36.573823]  system_call\u002B0x6e/0x90 [   36.573976] [   36.574017] Byte 35 of 98 is uninitialized [   36.574082] Memory access of size 98 starts at 0000000007aa0012 [   36.574218] [   36.574325] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.17.0-dirty #16 NONE [   36.574541] Tainted: [B]=BAD_PAGE, [N]=TEST [   36.574617] Hardware name: IBM 3931 A01 703 (KVM/Linux) [   36.574755] =====================================================  [   63.532541] ===================================================== [   63.533639] BUG: KMSAN: uninit-value in virtqueue_add\u002B0x35c6/0x7c70 [   63.533989]  virtqueue_add\u002B0x35c6/0x7c70 [   63.534940]  virtqueue_add_outbuf\u002B0xa0/0xb0 [   63.535861]  start_xmit\u002B0x288c/0x4a20 [   63.536708]  dev_hard_start_xmit\u002B0x302/0x900 [   63.537020]  sch_direct_xmit\u002B0x340/0xea0 [   63.537997]  __dev_queue_xmit\u002B0x2e94/0x59b0 [   63.538819]  neigh_resolve_output\u002B0x936/0xb40 [   63.539793]  ip_finish_output2\u002B0x1ee2/0x2200 [   63.540784]  __ip_finish_output\u002B0x272/0x7a0 [   63.541765]  ip_finish_output\u002B0x4e/0x5e0 [   63.542791]  ip_output\u002B0x166/0x410 [   63.543771]  ip_push_pending_frames\u002B0x1a2/0x470 [   63.544753]  raw_sendmsg\u002B0x1f06/0x2180 [   63.545033]  inet_sendmsg\u002B0xe6/0x190 [   63.546006]  __sys_sendto\u002B0x55e/0x8e0 ---truncated---",
  "published": "2026-01-05T10:15:56Z",
  "severity": "",
  "epss": 0.00184,
  "epssPercentile": 0.08069,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.13-1",
      "fix": "DEBIAN-CVE-2025-68751",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-68751",
      "released": "2026-01-05T10:15:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}