{
  "cveId": "CVE-2021-47597",
  "url": "https://patchblox.com/security/cve/CVE-2021-47597",
  "summary": "CVE-2021-47597 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47597, released June 19, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  inet_diag: fix kernel-infoleak for UDP sockets...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  inet_diag: fix kernel-infoleak for UDP sockets  KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users.  After analysis it turned out UDP was not initializing r-\u003Eidiag_expires. Other users of inet_sk_diag_fill() might make the same mistake in the future, so fix this in inet_sk_diag_fill().  [1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter\u002B0x69d/0x25c0 lib/iov_iter.c:670  instrument_copy_to_user include/linux/instrumented.h:121 [inline]  copyout lib/iov_iter.c:156 [inline]  _copy_to_iter\u002B0x69d/0x25c0 lib/iov_iter.c:670  copy_to_iter include/linux/uio.h:155 [inline]  simple_copy_to_iter\u002B0xf3/0x140 net/core/datagram.c:519  __skb_datagram_iter\u002B0x2cb/0x1280 net/core/datagram.c:425  skb_copy_datagram_iter\u002B0xdc/0x270 net/core/datagram.c:533  skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline]  netlink_recvmsg\u002B0x660/0x1c60 net/netlink/af_netlink.c:1974  sock_recvmsg_nosec net/socket.c:944 [inline]  sock_recvmsg net/socket.c:962 [inline]  sock_read_iter\u002B0x5a9/0x630 net/socket.c:1035  call_read_iter include/linux/fs.h:2156 [inline]  new_sync_read fs/read_write.c:400 [inline]  vfs_read\u002B0x1631/0x1980 fs/read_write.c:481  ksys_read\u002B0x28c/0x520 fs/read_write.c:619  __do_sys_read fs/read_write.c:629 [inline]  __se_sys_read fs/read_write.c:627 [inline]  __x64_sys_read\u002B0xdb/0x120 fs/read_write.c:627  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64\u002B0x54/0xd0 arch/x86/entry/common.c:82  entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  Uninit was created at:  slab_post_alloc_hook mm/slab.h:524 [inline]  slab_alloc_node mm/slub.c:3251 [inline]  __kmalloc_node_track_caller\u002B0xe0c/0x1510 mm/slub.c:4974  kmalloc_reserve net/core/skbuff.c:354 [inline]  __alloc_skb\u002B0x545/0xf90 net/core/skbuff.c:426  alloc_skb include/linux/skbuff.h:1126 [inline]  netlink_dump\u002B0x3d5/0x16a0 net/netlink/af_netlink.c:2245  __netlink_dump_start\u002B0xd1c/0xee0 net/netlink/af_netlink.c:2370  netlink_dump_start include/linux/netlink.h:254 [inline]  inet_diag_handler_cmd\u002B0x2e7/0x400 net/ipv4/inet_diag.c:1343  sock_diag_rcv_msg\u002B0x24a/0x620  netlink_rcv_skb\u002B0x447/0x800 net/netlink/af_netlink.c:2491  sock_diag_rcv\u002B0x63/0x80 net/core/sock_diag.c:276  netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]  netlink_unicast\u002B0x1095/0x1360 net/netlink/af_netlink.c:1345  netlink_sendmsg\u002B0x16f3/0x1870 net/netlink/af_netlink.c:1916  sock_sendmsg_nosec net/socket.c:704 [inline]  sock_sendmsg net/socket.c:724 [inline]  sock_write_iter\u002B0x594/0x690 net/socket.c:1057  do_iter_readv_writev\u002B0xa7f/0xc70  do_iter_write\u002B0x52c/0x1500 fs/read_write.c:851  vfs_writev fs/read_write.c:924 [inline]  do_writev\u002B0x63f/0xe30 fs/read_write.c:967  __do_sys_writev fs/read_write.c:1040 [inline]  __se_sys_writev fs/read_write.c:1037 [inline]  __x64_sys_writev\u002B0xe5/0x120 fs/read_write.c:1037  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64\u002B0x54/0xd0 arch/x86/entry/common.c:82  entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  Bytes 68-71 of 312 are uninitialized Memory access of size 312 starts at ffff88812ab54000 Data copied to user address 0000000020001440  CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011",
  "published": "2024-06-19T15:15:54Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
  "epss": 0.00254,
  "epssPercentile": 0.16971,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47597",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47597",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47597",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47597",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47597",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47597",
      "released": "2024-06-19T15:15:54Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}