{
  "cveId": "CVE-2021-47595",
  "url": "https://patchblox.com/security/cve/CVE-2021-47595",
  "summary": "CVE-2021-47595 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47595, 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:  net/sched: sch_ets: don\u0027t remove idle classes fr...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/sched: sch_ets: don\u0027t remove idle classes from the round-robin list  Shuang reported that the following script:   1) tc qdisc add dev ddd0 handle 10: parent 1: ets bands 8 strict 4 priomap 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7  2) mausezahn ddd0  -A 10.10.10.1 -B 10.10.10.2 -c 0 -a own -b 00:c1:a0:c1:a0:00 -t udp \u0026  3) tc qdisc change dev ddd0 handle 10: ets bands 4 strict 2 quanta 2500 2500 priomap 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3  crashes systematically when line 2) is commented:   list_del corruption, ffff8e028404bd30-\u003Enext is LIST_POISON1 (dead000000000100)  ------------[ cut here ]------------  kernel BUG at lib/list_debug.c:47!  invalid opcode: 0000 [#1] PREEMPT SMP NOPTI  CPU: 0 PID: 954 Comm: tc Not tainted 5.16.0-rc4\u002B #478  Hardware name: Red Hat KVM, BIOS 1.11.1-4.module\u002Bel8.1.0\u002B4066\u002B0f1aadab 04/01/2014  RIP: 0010:__list_del_entry_valid.cold.1\u002B0x12/0x47  Code: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff \u003C0f\u003E 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe  RSP: 0018:ffffae46807a3888 EFLAGS: 00010246  RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202  RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff  RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff  R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800  R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400  FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 0000000000350ef0  Call Trace:   \u003CTASK\u003E   ets_qdisc_change\u002B0x58b/0xa70 [sch_ets]   tc_modify_qdisc\u002B0x323/0x880   rtnetlink_rcv_msg\u002B0x169/0x4a0   netlink_rcv_skb\u002B0x50/0x100   netlink_unicast\u002B0x1a5/0x280   netlink_sendmsg\u002B0x257/0x4d0   sock_sendmsg\u002B0x5b/0x60   ____sys_sendmsg\u002B0x1f2/0x260   ___sys_sendmsg\u002B0x7c/0xc0   __sys_sendmsg\u002B0x57/0xa0   do_syscall_64\u002B0x3a/0x80   entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  RIP: 0033:0x7efdc8031338  Code: 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 8d 05 25 43 2c 00 8b 00 85 c0 75 17 b8 2e 00 00 00 0f 05 \u003C48\u003E 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 41 54 41 89 d4 55  RSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e  RAX: ffffffffffffffda RBX: 0000000061b37a97 RCX: 00007efdc8031338  RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003  RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940  R10: 000000000000000c R11: 0000000000000246 R12: 0000000000000001  R13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000   \u003C/TASK\u003E  Modules linked in: sch_ets sch_tbf dummy rfkill iTCO_wdt iTCO_vendor_support intel_rapl_msr intel_rapl_common joydev pcspkr i2c_i801 virtio_balloon i2c_smbus lpc_ich ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel serio_raw ghash_clmulni_intel ahci libahci libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod [last unloaded: sch_ets]  ---[ end trace f35878d1912655c2 ]---  RIP: 0010:__list_del_entry_valid.cold.1\u002B0x12/0x47  Code: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff \u003C0f\u003E 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe  RSP: 0018:ffffae46807a3888 EFLAGS: 00010246  RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202  RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff  RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff  R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800  R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400  FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 000000000 ---truncated---",
  "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:N/I:N/A:H",
  "epss": 0.00239,
  "epssPercentile": 0.15028,
  "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-2021-47595",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47595",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47595",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47595",
      "released": "2024-06-19T15:15:54Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-47595",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47595",
      "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"
  }
}