Vulnerability-Lookup

GSD-2021-47175

Vulnerability from gsd - Updated: 2024-04-03 05:03

Details

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+0x1314/0x19d0 [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+ #441 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 Call Trace: dump_stack+0x92/0xc1 print_address_description.constprop.7+0x1a/0x150 kasan_report.cold.13+0x7f/0x111 fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie] __dev_queue_xmit+0x1034/0x2b10 ip_finish_output2+0xc62/0x2120 __ip_finish_output+0x553/0xea0 ip_output+0x1ca/0x4d0 ip_send_skb+0x37/0xa0 raw_sendmsg+0x1c4b/0x2d00 sock_sendmsg+0xdb/0x110 __sys_sendto+0x1d7/0x2b0 __x64_sys_sendto+0xdd/0x1b0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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 <48> 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+0x19/0x40 __kasan_kmalloc+0x7f/0xa0 __kmalloc_node+0x139/0x280 fq_pie_init+0x555/0x8e8 [sch_fq_pie] qdisc_create+0x407/0x11b0 tc_modify_qdisc+0x3c2/0x17e0 rtnetlink_rcv_msg+0x346/0x8e0 netlink_rcv_skb+0x120/0x380 netlink_unicast+0x439/0x630 netlink_sendmsg+0x719/0xbf0 sock_sendmsg+0xe2/0x110 ____sys_sendmsg+0x5ba/0x890 ___sys_sendmsg+0xe9/0x160 __sys_sendmsg+0xd3/0x170 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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 >ffff888171306900: 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 'q->flows + q->flows_cnt' as a valid flow: it's an address beyond the allocated memory.

Aliases

CVE-2021-47175

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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47175"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: fix OOB access in the traffic path\n\nthe following script:\n\n  # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2\n  # tc qdisc add dev eth0 clsact\n  # tc filter add dev eth0 egress matchall action skbedit priority 0x10002\n  # ping 192.0.2.2 -I eth0 -c2 -w1 -q\n\nproduces the following splat:\n\n BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n Read of size 4 at addr ffff888171306924 by task ping/942\n\n CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n  __dev_queue_xmit+0x1034/0x2b10\n  ip_finish_output2+0xc62/0x2120\n  __ip_finish_output+0x553/0xea0\n  ip_output+0x1ca/0x4d0\n  ip_send_skb+0x37/0xa0\n  raw_sendmsg+0x1c4b/0x2d00\n  sock_sendmsg+0xdb/0x110\n  __sys_sendto+0x1d7/0x2b0\n  __x64_sys_sendto+0xdd/0x1b0\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7fe69735c3eb\n 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\n RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb\n RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003\n RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260\n R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0\n\n Allocated by task 917:\n  kasan_save_stack+0x19/0x40\n  __kasan_kmalloc+0x7f/0xa0\n  __kmalloc_node+0x139/0x280\n  fq_pie_init+0x555/0x8e8 [sch_fq_pie]\n  qdisc_create+0x407/0x11b0\n  tc_modify_qdisc+0x3c2/0x17e0\n  rtnetlink_rcv_msg+0x346/0x8e0\n  netlink_rcv_skb+0x120/0x380\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n The buggy address belongs to the object at ffff888171306800\n  which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 36 bytes to the right of\n  256-byte region [ffff888171306800, ffff888171306900)\n The buggy address belongs to the page:\n page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306\n head:00000000bcfb624e order:1 compound_mapcount:0\n flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc\n \u003effff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n                                ^\n  ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n  ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nfix fq_pie traffic path to avoid selecting \u0027q-\u003eflows + q-\u003eflows_cnt\u0027 as a\nvalid flow: it\u0027s an address beyond the allocated memory.",
      "id": "GSD-2021-47175",
      "modified": "2024-04-03T05:03:54.990282Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47175",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "ec97ecf1ebe4",
                          "version_value": "e6294c06e7c6"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "5.6"
                              },
                              {
                                "lessThan": "5.6",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.10.*",
                                "status": "unaffected",
                                "version": "5.10.42",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.12.*",
                                "status": "unaffected",
                                "version": "5.12.9",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "5.13",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: fix OOB access in the traffic path\n\nthe following script:\n\n  # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2\n  # tc qdisc add dev eth0 clsact\n  # tc filter add dev eth0 egress matchall action skbedit priority 0x10002\n  # ping 192.0.2.2 -I eth0 -c2 -w1 -q\n\nproduces the following splat:\n\n BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n Read of size 4 at addr ffff888171306924 by task ping/942\n\n CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n  __dev_queue_xmit+0x1034/0x2b10\n  ip_finish_output2+0xc62/0x2120\n  __ip_finish_output+0x553/0xea0\n  ip_output+0x1ca/0x4d0\n  ip_send_skb+0x37/0xa0\n  raw_sendmsg+0x1c4b/0x2d00\n  sock_sendmsg+0xdb/0x110\n  __sys_sendto+0x1d7/0x2b0\n  __x64_sys_sendto+0xdd/0x1b0\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7fe69735c3eb\n 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\n RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb\n RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003\n RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260\n R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0\n\n Allocated by task 917:\n  kasan_save_stack+0x19/0x40\n  __kasan_kmalloc+0x7f/0xa0\n  __kmalloc_node+0x139/0x280\n  fq_pie_init+0x555/0x8e8 [sch_fq_pie]\n  qdisc_create+0x407/0x11b0\n  tc_modify_qdisc+0x3c2/0x17e0\n  rtnetlink_rcv_msg+0x346/0x8e0\n  netlink_rcv_skb+0x120/0x380\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n The buggy address belongs to the object at ffff888171306800\n  which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 36 bytes to the right of\n  256-byte region [ffff888171306800, ffff888171306900)\n The buggy address belongs to the page:\n page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306\n head:00000000bcfb624e order:1 compound_mapcount:0\n flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc\n \u003effff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n                                ^\n  ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n  ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nfix fq_pie traffic path to avoid selecting \u0027q-\u003eflows + q-\u003eflows_cnt\u0027 as a\nvalid flow: it\u0027s an address beyond the allocated memory."
          }
        ]
      },
      "generator": {
        "engine": "bippy-b4257b672505"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c"
          },
          {
            "name": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce"
          },
          {
            "name": "https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: fix OOB access in the traffic path\n\nthe following script:\n\n  # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2\n  # tc qdisc add dev eth0 clsact\n  # tc filter add dev eth0 egress matchall action skbedit priority 0x10002\n  # ping 192.0.2.2 -I eth0 -c2 -w1 -q\n\nproduces the following splat:\n\n BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n Read of size 4 at addr ffff888171306924 by task ping/942\n\n CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n  __dev_queue_xmit+0x1034/0x2b10\n  ip_finish_output2+0xc62/0x2120\n  __ip_finish_output+0x553/0xea0\n  ip_output+0x1ca/0x4d0\n  ip_send_skb+0x37/0xa0\n  raw_sendmsg+0x1c4b/0x2d00\n  sock_sendmsg+0xdb/0x110\n  __sys_sendto+0x1d7/0x2b0\n  __x64_sys_sendto+0xdd/0x1b0\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7fe69735c3eb\n 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\n RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb\n RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003\n RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260\n R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0\n\n Allocated by task 917:\n  kasan_save_stack+0x19/0x40\n  __kasan_kmalloc+0x7f/0xa0\n  __kmalloc_node+0x139/0x280\n  fq_pie_init+0x555/0x8e8 [sch_fq_pie]\n  qdisc_create+0x407/0x11b0\n  tc_modify_qdisc+0x3c2/0x17e0\n  rtnetlink_rcv_msg+0x346/0x8e0\n  netlink_rcv_skb+0x120/0x380\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n The buggy address belongs to the object at ffff888171306800\n  which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 36 bytes to the right of\n  256-byte region [ffff888171306800, ffff888171306900)\n The buggy address belongs to the page:\n page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306\n head:00000000bcfb624e order:1 compound_mapcount:0\n flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc\n \u003effff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n                                ^\n  ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n  ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nfix fq_pie traffic path to avoid selecting \u0027q-\u003eflows + q-\u003eflows_cnt\u0027 as a\nvalid flow: it\u0027s an address beyond the allocated memory."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: fq_pie: arregla el acceso OOB en la ruta de tr\u00e1fico el siguiente script: # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2 # tc qdisc add dev eth0 clsact # tc filtrar agregar dev eth0 salida matchall acci\u00f3n skbedit prioridad 0x10002 # ping 192.0.2.2 -I eth0 -c2 -w1 -q produce el siguiente s\u00edmbolo: ERROR: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie] Leer de tama\u00f1o 4 en la direcci\u00f3n ffff888171306924 por tarea ping/942 CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441 Nombre de hardware: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+ 0f1aadab 01/04/2014 Seguimiento de llamadas: dump_stack+0x92/0xc1 print_address_description.constprop.7+0x1a/0x150 kasan_report.cold.13+0x7f/0x111 fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie] __dev_queue_x mit+0x1034/0x2b10 ip_finish_output2+0xc62/0x2120 __ip_finish_output+0x553/0xea0 ip_output+0x1ca/0x4d0 ip_send_skb+0x37/0xa0 raw_sendmsg+0x1c4b/0x2d00 sock_sendmsg+0xdb/0x110 __sys_sendto+0x1d7/0x2b0 __x64_sys_s endto+0xdd/0x1b0 do_syscall_64+0x3c/0x80 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe69735c3eb C\u00f3digo: 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 \u0026lt;48 \u0026gt; 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: 00000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260 R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0 Asignado por la tarea 917: kasan_save_stack+0x19/0x40 __kasan_kmalloc+0x7f/0xa0 __kmalloc_node+0x139/0x280 fq_pie_init+0x555/0x8e8 [ sch_fq_pie] qdisc_create+0x407/0x11b0 tc_modify_qdisc+0x3c2/0x17e0 rtnetlink_rcv_msg+0x346/0x8e0 netlink_rcv_skb+0x120/0x380 netlink_unicast+0x439/0x630 netlink_sendmsg+0x719/ 0xbf0 sock_sendmsg+0xe2/0x110 ____sys_sendmsg+0x5ba/0x890 ___sys_sendmsg+0xe9/0x160 __sys_sendmsg+0xd3 /0x170 do_syscall_64+0x3c/0x80 Entry_SYSCALL_64_after_hwframe+0x44/0xae La direcci\u00f3n con errores pertenece al objeto en ffff888171306800 que pertenece al cach\u00e9 kmalloc-256 de tama\u00f1o 256. La direcci\u00f3n con errores se encuentra 36 bytes a la derecha de la regi\u00f3n de 256 bytes [ffff888171306 800, ffff888171306900) La direcci\u00f3n del error pertenece a la p\u00e1gina: p\u00e1gina:00000000bcfb624e refcount:1 mapcount:0 mapeo:0000000000000000 index:0x0 pfn:0x171306 head:00000000bcfb624e order:1 composite_mapcount:0 flags: 0x17ffffc00 10200(losa|cabeza|nodo=0|zona =2|lastcpupid=0x1fffff) raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40 raw: 000000000000000000 0000000000100010 00000001ffffffff 0000000000000000 p\u00e1gina volcada porque: kasan: se detect\u00f3 mal acceso Estado de la memoria alrededor de la direcci\u00f3n con errores: 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 \u0026gt;ffff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888 171306980: fc 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 corrige la ruta de tr\u00e1fico fq_pie para evitar seleccionar \u0027q-\u0026gt;flows + q-\u0026gt;flows_cnt\u0027 como un flujo v\u00e1lido: es una direcci\u00f3n m\u00e1s all\u00e1 de la memoria asignada."
          }
        ],
        "id": "CVE-2021-47175",
        "lastModified": "2024-03-25T13:47:14.087",
        "metrics": {},
        "published": "2024-03-25T10:15:09.110",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}

CVE-2021-47175 (GCVE-0-2021-47175)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-08-05 08:46

Title

net/sched: fq_pie: fix OOB access in the traffic path

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-28 18:24 UTC

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e6294c06e7c62ffdd…
https://git.kernel.org/stable/c/7a1bdec12e43e29cc…
https://git.kernel.org/stable/c/e70f7a11876a1a788…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3c (git) Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < 7a1bdec12e43e29cc34a4394590337069d8812ce (git) Affected: ec97ecf1ebe485a17cd8395a5f35e6b80b57665a , < e70f7a11876a1a788ceadf75e9e5f7af2c868680 (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.42 , ≤ 5.10.* (semver) Unaffected: 5.12.9 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47175",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-28T18:24:58.134002Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:14:58.740Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:24:39.980Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ce"
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              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680"
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        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_fq_pie.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
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              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.42",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.9",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: fix OOB access in the traffic path\n\nthe following script:\n\n  # tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2\n  # tc qdisc add dev eth0 clsact\n  # tc filter add dev eth0 egress matchall action skbedit priority 0x10002\n  # ping 192.0.2.2 -I eth0 -c2 -w1 -q\n\nproduces the following splat:\n\n BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n Read of size 4 at addr ffff888171306924 by task ping/942\n\n CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]\n  __dev_queue_xmit+0x1034/0x2b10\n  ip_finish_output2+0xc62/0x2120\n  __ip_finish_output+0x553/0xea0\n  ip_output+0x1ca/0x4d0\n  ip_send_skb+0x37/0xa0\n  raw_sendmsg+0x1c4b/0x2d00\n  sock_sendmsg+0xdb/0x110\n  __sys_sendto+0x1d7/0x2b0\n  __x64_sys_sendto+0xdd/0x1b0\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7fe69735c3eb\n 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\n RSP: 002b:00007fff06d7fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055e961413700 RCX: 00007fe69735c3eb\n RDX: 0000000000000040 RSI: 000055e961413700 RDI: 0000000000000003\n RBP: 0000000000000040 R08: 000055e961410500 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff06d81260\n R13: 00007fff06d7fb40 R14: 00007fff06d7fc30 R15: 000055e96140f0a0\n\n Allocated by task 917:\n  kasan_save_stack+0x19/0x40\n  __kasan_kmalloc+0x7f/0xa0\n  __kmalloc_node+0x139/0x280\n  fq_pie_init+0x555/0x8e8 [sch_fq_pie]\n  qdisc_create+0x407/0x11b0\n  tc_modify_qdisc+0x3c2/0x17e0\n  rtnetlink_rcv_msg+0x346/0x8e0\n  netlink_rcv_skb+0x120/0x380\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x3c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n The buggy address belongs to the object at ffff888171306800\n  which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 36 bytes to the right of\n  256-byte region [ffff888171306800, ffff888171306900)\n The buggy address belongs to the page:\n page:00000000bcfb624e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x171306\n head:00000000bcfb624e order:1 compound_mapcount:0\n flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n raw: 0017ffffc0010200 dead000000000100 dead000000000122 ffff888100042b40\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff888171306800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888171306880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc\n \u003effff888171306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n                                ^\n  ffff888171306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n  ffff888171306a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nfix fq_pie traffic path to avoid selecting \u0027q-\u003eflows + q-\u003eflows_cnt\u0027 as a\nvalid flow: it\u0027s an address beyond the allocated memory."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is in the fq_pie qdisc traffic path, reached after configuring the qdisc via tc/netlink and sending packets; kernel guidance classifies tc/qdisc bugs as Local.\nAC:L - An attacker who installs fq_pie can reliably force the OOB index by hashing into the last flow, or by setting skb priority/classid to flows_cnt (e.g. skbedit), with no conditions outside their control.\nPR:L - Creating and configuring fq_pie requires CAP_NET_ADMIN, which is obtainable in a user namespace via netlink_ns_capable(net-\u003euser_ns), so privileges are Low rather than High.\nUI:N - Once the attacker has CAP_NET_ADMIN in their userns, they can create the qdisc and trigger the OOB themselves by transmitting packets; no victim interaction is required.\nS:U - Exploitation corrupts kernel heap memory and can escalate privileges within the same kernel authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug performs an out-of-bounds read of an entire fq_pie_flow (~100+ bytes) past the flows array into adjacent slab memory, and the resulting heap corruption can be leveraged for further information disclosure.\nI:H - Every hit writes out-of-bounds (at least accu_prob on the drop path), and the enqueue path performs flow_queue_add and list_add_tail on the OOB flow, enabling classic kernel heap list corruption and arbitrary write primitives.\nA:H - The OOB access causes a KASAN-detectable slab-out-of-bounds fault and can oops/panic the kernel, fully impacting availability."
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:46:29.396Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      ],
      "title": "net/sched: fq_pie: fix OOB access in the traffic path",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47175",
    "datePublished": "2024-03-25T09:16:25.995Z",
    "dateReserved": "2024-03-25T09:12:14.111Z",
    "dateUpdated": "2026-08-05T08:46:29.396Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GSD-2021-47175

CVE-2021-47175 (GCVE-0-2021-47175)

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Nomenclature

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