{
  "cveId": "CVE-2021-47175",
  "url": "https://patchblox.com/security/cve/CVE-2021-47175",
  "summary": "CVE-2021-47175 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47175, released March 25, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/sched: fq_pie: fix OOB access in the traffic...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/sched: fq_pie: fix OOB access in the traffic path  the following script:    # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2   # tc qdisc add dev eth0 clsact   # tc filter add dev eth0 egress matchall action skbedit priority 0x10002   # ping 192.0.2.2 -I eth0 -c2 -w1 -q  produces the following splat:   BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue\u002B0x1314/0x19d0 [sch_fq_pie]  Read of size 4 at addr ffff888171306924 by task ping/942   CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0\u002B #441  Hardware name: Red Hat KVM, BIOS 1.11.1-4.module\u002Bel8.1.0\u002B4066\u002B0f1aadab 04/01/2014  Call Trace:   dump_stack\u002B0x92/0xc1   print_address_description.constprop.7\u002B0x1a/0x150   kasan_report.cold.13\u002B0x7f/0x111   fq_pie_qdisc_enqueue\u002B0x1314/0x19d0 [sch_fq_pie]   __dev_queue_xmit\u002B0x1034/0x2b10   ip_finish_output2\u002B0xc62/0x2120   __ip_finish_output\u002B0x553/0xea0   ip_output\u002B0x1ca/0x4d0   ip_send_skb\u002B0x37/0xa0   raw_sendmsg\u002B0x1c4b/0x2d00   sock_sendmsg\u002B0xdb/0x110   __sys_sendto\u002B0x1d7/0x2b0   __x64_sys_sendto\u002B0xdd/0x1b0   do_syscall_64\u002B0x3c/0x80   entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  RIP: 0033:0x7fe69735c3eb  Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa 48 8d 05 75 42 2c 00 41 89 ca 8b 00 85 c0 75 14 b8 2c 00 00 00 0f 05 \u003C48\u003E 3d 00 f0 ff ff 77 75 c3 0f 1f 40 00 41 57 4d 89 c7 41 56 41 89  RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c  RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb  RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003  RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010  R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260  R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0   Allocated by task 917:   kasan_save_stack\u002B0x19/0x40   __kasan_kmalloc\u002B0x7f/0xa0   __kmalloc_node\u002B0x139/0x280   fq_pie_init\u002B0x555/0x8e8 [sch_fq_pie]   qdisc_create\u002B0x407/0x11b0   tc_modify_qdisc\u002B0x3c2/0x17e0   rtnetlink_rcv_msg\u002B0x346/0x8e0   netlink_rcv_skb\u002B0x120/0x380   netlink_unicast\u002B0x439/0x630   netlink_sendmsg\u002B0x719/0xbf0   sock_sendmsg\u002B0xe2/0x110   ____sys_sendmsg\u002B0x5ba/0x890   ___sys_sendmsg\u002B0xe9/0x160   __sys_sendmsg\u002B0xd3/0x170   do_syscall_64\u002B0x3c/0x80   entry_SYSCALL_64_after_hwframe\u002B0x44/0xae   The buggy address belongs to the object at ffff888171306800   which belongs to the cache kmalloc-256 of size 256  The buggy address is located 36 bytes to the right of   256-byte region [ffff888171306800, ffff888171306900)  The buggy address belongs to the page:  page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306  head:00000000bcfb624e order:1 compound_mapcount:0  flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)  raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40  raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000  page dumped because: kasan: bad access detected   Memory state around the buggy address:   ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc  \u003Effff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc                                 ^   ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc   ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb  fix fq_pie traffic path to avoid selecting \u0027q-\u003Eflows \u002B q-\u003Eflows_cnt\u0027 as a valid flow: it\u0027s an address beyond the allocated memory.",
  "published": "2024-03-25T10:15:09Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00243,
  "epssPercentile": 0.15615,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47175",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47175",
      "released": "2024-03-25T10:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47175",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47175",
      "released": "2024-03-25T10:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47175",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47175",
      "released": "2024-03-25T10:15:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}