{
  "cveId": "CVE-2021-47598",
  "url": "https://patchblox.com/security/cve/CVE-2021-47598",
  "summary": "CVE-2021-47598 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47598, released June 19, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sch_cake: do not call cake_destroy() from cake_i...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sch_cake: do not call cake_destroy() from cake_init()  qdiscs are not supposed to call their own destroy() method from init(), because core stack already does that.  syzbot was able to trigger use after free:  DEBUG_LOCKS_WARN_ON(lock-\u003Emagic != lock) WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock_common kernel/locking/mutex.c:586 [inline] WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock\u002B0x9ec/0x12f0 kernel/locking/mutex.c:740 Modules linked in: CPU: 0 PID: 21902 Comm: syz-executor189 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:586 [inline] RIP: 0010:__mutex_lock\u002B0x9ec/0x12f0 kernel/locking/mutex.c:740 Code: 08 84 d2 0f 85 19 08 00 00 8b 05 97 38 4b 04 85 c0 0f 85 27 f7 ff ff 48 c7 c6 20 00 ac 89 48 c7 c7 a0 fe ab 89 e8 bf 76 ba ff \u003C0f\u003E 0b e9 0d f7 ff ff 48 8b 44 24 40 48 8d b8 c8 08 00 00 48 89 f8 RSP: 0018:ffffc9000627f290 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802315d700 RSI: ffffffff815f1db8 RDI: fffff52000c4fe44 RBP: ffff88818f28e000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815ebb5e R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffc9000627f458 R15: 0000000093c30000 FS:  0000555556abc400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fda689c3303 CR3: 000000001cfbb000 CR4: 0000000000350ef0 Call Trace:  \u003CTASK\u003E  tcf_chain0_head_change_cb_del\u002B0x2e/0x3d0 net/sched/cls_api.c:810  tcf_block_put_ext net/sched/cls_api.c:1381 [inline]  tcf_block_put_ext net/sched/cls_api.c:1376 [inline]  tcf_block_put\u002B0xbc/0x130 net/sched/cls_api.c:1394  cake_destroy\u002B0x3f/0x80 net/sched/sch_cake.c:2695  qdisc_create.constprop.0\u002B0x9da/0x10f0 net/sched/sch_api.c:1293  tc_modify_qdisc\u002B0x4c5/0x1980 net/sched/sch_api.c:1660  rtnetlink_rcv_msg\u002B0x413/0xb80 net/core/rtnetlink.c:5571  netlink_rcv_skb\u002B0x153/0x420 net/netlink/af_netlink.c:2496  netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]  netlink_unicast\u002B0x533/0x7d0 net/netlink/af_netlink.c:1345  netlink_sendmsg\u002B0x904/0xdf0 net/netlink/af_netlink.c:1921  sock_sendmsg_nosec net/socket.c:704 [inline]  sock_sendmsg\u002B0xcf/0x120 net/socket.c:724  ____sys_sendmsg\u002B0x6e8/0x810 net/socket.c:2409  ___sys_sendmsg\u002B0xf3/0x170 net/socket.c:2463  __sys_sendmsg\u002B0xe5/0x1b0 net/socket.c:2492  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64\u002B0x35/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe\u002B0x44/0xae RIP: 0033:0x7f1bb06badb9 Code: Unable to access opcode bytes at RIP 0x7f1bb06bad8f. RSP: 002b:00007fff3012a658 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f1bb06badb9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000246 R12: 00007fff3012a688 R13: 00007fff3012a6a0 R14: 00007fff3012a6e0 R15: 00000000000013c2  \u003C/TASK\u003E",
  "published": "2024-06-19T15:15:54Z",
  "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": 0.00255,
  "epssPercentile": 0.17214,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47598",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47598",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47598",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47598",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47598",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47598",
      "released": "2024-06-19T15:15:54Z"
    }
  ],
  "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"
  }
}