CVE-2021-47595 (GCVE-0-2021-47595)

Vulnerability from cvelistv5 – Published: 2024-06-19 14:53 – Updated: 2025-05-04 07:14
VLAI?
Title
net/sched: sch_ets: don't remove idle classes from the round-robin list
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_ets: don't 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 & 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->next 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+ #478 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 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 <0f> 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: <TASK> ets_qdisc_change+0x58b/0xa70 [sch_ets] tc_modify_qdisc+0x323/0x880 rtnetlink_rcv_msg+0x169/0x4a0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1a5/0x280 netlink_sendmsg+0x257/0x4d0 sock_sendmsg+0x5b/0x60 ____sys_sendmsg+0x1f2/0x260 ___sys_sendmsg+0x7c/0xc0 __sys_sendmsg+0x57/0xa0 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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 <48> 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 </TASK> 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+0x12/0x47 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 <0f> 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---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ae2659d2c670252759ee9c823c4e039c0e05a6f2 , < 81fbdd45652d8605a029e78ef14a6aaa529c4e72 (git)
Affected: e25bdbc7e951ae5728fee1f4c09485df113d013c , < 491c1253441e2fdc8f6a6f4976e3f13440419b7a (git)
Affected: de6d25924c2a8c2988c6a385990cafbe742061bf , < c062f2a0b04d86c5b8c9d973bea43493eaca3d32 (git)
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    Linux Linux Affected: 5.10.83 , < 5.10.88 (semver)
Affected: 5.15.6 , < 5.15.11 (semver)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don\u0027t remove idle classes from the round-robin list\n\nShuang reported that the following script:\n\n 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\n 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\n 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\n\ncrashes systematically when line 2) is commented:\n\n list_del corruption, ffff8e028404bd30-\u003enext is LIST_POISON1 (dead000000000100)\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:47!\n invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 0 PID: 954 Comm: tc Not tainted 5.16.0-rc4+ #478\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\n 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\n RSP: 0018:ffffae46807a3888 EFLAGS: 00010246\n RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\n RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\n RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\n R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\n R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\n FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 0000000000350ef0\n Call Trace:\n  \u003cTASK\u003e\n  ets_qdisc_change+0x58b/0xa70 [sch_ets]\n  tc_modify_qdisc+0x323/0x880\n  rtnetlink_rcv_msg+0x169/0x4a0\n  netlink_rcv_skb+0x50/0x100\n  netlink_unicast+0x1a5/0x280\n  netlink_sendmsg+0x257/0x4d0\n  sock_sendmsg+0x5b/0x60\n  ____sys_sendmsg+0x1f2/0x260\n  ___sys_sendmsg+0x7c/0xc0\n  __sys_sendmsg+0x57/0xa0\n  do_syscall_64+0x3a/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7efdc8031338\n 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\n RSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 0000000061b37a97 RCX: 00007efdc8031338\n RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940\n R10: 000000000000000c R11: 0000000000000246 R12: 0000000000000001\n R13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000\n  \u003c/TASK\u003e\n 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]\n ---[ end trace f35878d1912655c2 ]---\n RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\n 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\n RSP: 0018:ffffae46807a3888 EFLAGS: 00010246\n RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\n RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\n RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\n R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\n R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\n FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 000000000\n---truncated---"
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    "datePublished": "2024-06-19T14:53:57.568Z",
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    "dateUpdated": "2025-05-04T07:14:28.152Z",
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-B 10.10.10.2 -c 0 -a own -b 00:c1:a0:c1:a0:00 -t udp \u0026\\n 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\\n\\ncrashes systematically when line 2) is commented:\\n\\n list_del corruption, ffff8e028404bd30-\u003enext is LIST_POISON1 (dead000000000100)\\n ------------[ cut here ]------------\\n kernel BUG at lib/list_debug.c:47!\\n invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\\n CPU: 0 PID: 954 Comm: tc Not tainted 5.16.0-rc4+ #478\\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\\n RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\\n 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\\n RSP: 0018:ffffae46807a3888 EFLAGS: 00010246\\n RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\\n RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\\n RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\\n R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\\n R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\\n FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 0000000000350ef0\\n Call Trace:\\n  \u003cTASK\u003e\\n  ets_qdisc_change+0x58b/0xa70 [sch_ets]\\n  tc_modify_qdisc+0x323/0x880\\n  rtnetlink_rcv_msg+0x169/0x4a0\\n  netlink_rcv_skb+0x50/0x100\\n  netlink_unicast+0x1a5/0x280\\n  netlink_sendmsg+0x257/0x4d0\\n  sock_sendmsg+0x5b/0x60\\n  ____sys_sendmsg+0x1f2/0x260\\n  ___sys_sendmsg+0x7c/0xc0\\n  __sys_sendmsg+0x57/0xa0\\n  do_syscall_64+0x3a/0x80\\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n RIP: 0033:0x7efdc8031338\\n 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\\n RSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\\n RAX: ffffffffffffffda RBX: 0000000061b37a97 RCX: 00007efdc8031338\\n RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003\\n RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940\\n R10: 000000000000000c R11: 0000000000000246 R12: 0000000000000001\\n R13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000\\n  \u003c/TASK\u003e\\n 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]\\n ---[ end trace f35878d1912655c2 ]---\\n RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\\n 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\\n RSP: 0018:ffffae46807a3888 EFLAGS: 00010246\\n RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\\n RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\\n RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\\n R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\\n R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\\n FS:  00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 000000000\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-06-19T14:53:57.568Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47595\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:47:40.255Z\", \"dateReserved\": \"2024-05-24T15:11:00.733Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T14:53:57.568Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.