CVE-2021-47595

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47595", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:11:00.733Z", "datePublished": "2024-06-19T14:53:57.568Z", "dateUpdated": "2026-05-11T13:57:34.852Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:57:34.852Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don't 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 &\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->next 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 <0f> 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 <TASK>\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 <48> 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 </TASK>\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 <0f> 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---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_ets.c"], "versions": [{"version": "ae2659d2c670252759ee9c823c4e039c0e05a6f2", "lessThan": "81fbdd45652d8605a029e78ef14a6aaa529c4e72", "status": "affected", "versionType": "git"}, {"version": "e25bdbc7e951ae5728fee1f4c09485df113d013c", "lessThan": "491c1253441e2fdc8f6a6f4976e3f13440419b7a", "status": "affected", "versionType": "git"}, {"version": "de6d25924c2a8c2988c6a385990cafbe742061bf", "lessThan": "c062f2a0b04d86c5b8c9d973bea43493eaca3d32", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_ets.c"], "versions": [{"version": "5.10.83", "lessThan": "5.10.88", "status": "affected", "versionType": "semver"}, {"version": "5.15.6", "lessThan": "5.15.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.83", "versionEndExcluding": "5.10.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.6", "versionEndExcluding": "5.15.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72"}, {"url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a"}, {"url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32"}], "title": "net/sched: sch_ets: don't remove idle classes from the round-robin list", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-21T14:04:57.060953Z", "id": "CVE-2021-47595", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-21T14:05:11.250Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:47:40.255Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:47:40.255Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47595", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-21T14:04:57.060953Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-21T14:05:06.575Z"}}], "cna": {"title": "net/sched: sch_ets: don't remove idle classes from the round-robin list", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ae2659d2c670", "lessThan": "81fbdd45652d", "versionType": "git"}, {"status": "affected", "version": "e25bdbc7e951", "lessThan": "491c1253441e", "versionType": "git"}, {"status": "affected", "version": "de6d25924c2a", "lessThan": "c062f2a0b04d", "versionType": "git"}], "programFiles": ["net/sched/sch_ets.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10.83", "lessThan": "5.10.88", "versionType": "custom"}, {"status": "affected", "version": "5.15.6", "lessThan": "5.15.11", "versionType": "custom"}], "programFiles": ["net/sched/sch_ets.c"], "defaultStatus": "unaffected"}], "references": [{"url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72"}, {"url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a"}, {"url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32"}], "x_generator": {"engine": "bippy-a5840b7849dd"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don't 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 &\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->next 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 <0f> 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 <TASK>\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 <48> 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 </TASK>\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 <0f> 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"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/sch_ets.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "81fbdd45652d8605a029e78ef14a6aaa529c4e72", "status": "affected", "version": "ae2659d2c670252759ee9c823c4e039c0e05a6f2", "versionType": "git"}, {"lessThan": "491c1253441e2fdc8f6a6f4976e3f13440419b7a", "status": "affected", "version": "e25bdbc7e951ae5728fee1f4c09485df113d013c", "versionType": "git"}, {"lessThan": "c062f2a0b04d86c5b8c9d973bea43493eaca3d32", "status": "affected", "version": "de6d25924c2a8c2988c6a385990cafbe742061bf", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/sch_ets.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5.10.88", "status": "affected", "version": "5.10.83", "versionType": "semver"}, {"lessThan": "5.15.11", "status": "affected", "version": "5.15.6", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8CE254F6-35BF-434F-B6CA-BDFCD944AAA4", "versionEndExcluding": "5.10.88", "versionStartIncluding": "5.10.83", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1A3B9E2F-A621-4129-9702-D8D427A1E747", "versionEndExcluding": "5.15.11", "versionStartIncluding": "5.15.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don't 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 &\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->next 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 <0f> 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 <TASK>\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 <48> 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 </TASK>\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 <0f> 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---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/sched: sch_ets: no elimine las clases inactivas de la lista de turnos Shuang inform\u00f3 que el siguiente script: 1) tc qdisc add dev ddd0 handle 10: parent 1: ets bandas 8 estricto 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 propio -b 00:c1:a0: c1:a0:00 -t udp &amp; 3) tc qdisc change dev ddd0 handle 10: ets bands 4 estricto 2 cuantos 2500 2500 priomap 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 falla sistem\u00e1ticamente cuando la l\u00ednea 2) se comenta: corrupci\u00f3n list_del, ffff8e028404bd30-&gt;el siguiente es LIST_POISON1 (dead000000000100) ------------[ cortar aqu\u00ed ]------------ ERROR del kernel en lib/list_debug. c:47! c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 954 Comunicaciones: tc Not tainted 5.16.0-rc4+ #478 Nombre de hardware: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066 +0f1aadab 01/04/2014 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 C\u00f3digo: 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 4 8 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff &lt;0f&gt; 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: 246 RAX: 000000000000004eRBX : 0000000000000007 RCX: 0000000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 00000000000 00000 R09: c0000000ffff7fff R10: 00000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800 R13: ffff8e028404bd30 R14: dead000000000100 R15: e02fafa2400 FS: 00007efdc92e4480(0000) GS:ffff8e02fb600000 (0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 000000000035 0ef0 Seguimiento de llamadas: 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 C\u00f3digo: 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 0f 05 &lt;48&gt; 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: de RBX: 0000000061b37a97 RCX: 00007efdc8031338 RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940 R10: 000000000000000c R11: 00000000000000246 R12: 0000000000000001 R 13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000 M\u00f3dulos vinculados en: sch_ets sch_tbf dummy rfkill iTCO_wdt iTCO_vendor_support intel_rapl_msr intel_rapl_common pcs pkr 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 [\u00faltima descarga: sch_ets] ---[ fin de seguimiento f35878d191 2655c2 ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 C\u00f3digo: 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 &lt;0f&gt; 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 000 0000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff R10: 0000000000000001 R11: FFFFFAE46807A36A8 R12: FFFFF8E028404B800 R13: FFFF8E028404BD30 R14: Dead000000000100 R15: FFFFF8E02FAFA2400 FUT: GS: FFFF8E02FB600000 (0000) KNLGS: 000000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000 - --truncado---"}], "id": "CVE-2021-47595", "lastModified": "2026-06-17T04:17:50.403", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47595", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-21T14:04:57.060953Z", "version": "2.0.3"}}]}, "published": "2024-06-19T15:15:54.097", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/sched: sch_ets: don't remove idle classes from the round-robin list", "id": "2293231", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293231"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: sch_ets: don't remove idle classes from the round-robin list\nShuang reported that the following script:\n1) 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\n2) 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 &\n3) 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\ncrashes systematically when line 2) is commented:\nlist_del corruption, ffff8e028404bd30->next is LIST_POISON1 (dead000000000100)\n------------[ cut here ]------------\nkernel BUG at lib/list_debug.c:47!\ninvalid opcode: 0000 [#1] PREEMPT SMP NOPTI\nCPU: 0 PID: 954 Comm: tc Not tainted 5.16.0-rc4+ #478\nHardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\nRIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\nCode: 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\nRSP: 0018:ffffae46807a3888 EFLAGS: 00010246\nRAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\nRDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\nRBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\nR10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\nR13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\nFS: 00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000682f48 CR3: 00000001058be000 CR4: 0000000000350ef0\nCall Trace:\n<TASK>\nets_qdisc_change+0x58b/0xa70 [sch_ets]\ntc_modify_qdisc+0x323/0x880\nrtnetlink_rcv_msg+0x169/0x4a0\nnetlink_rcv_skb+0x50/0x100\nnetlink_unicast+0x1a5/0x280\nnetlink_sendmsg+0x257/0x4d0\nsock_sendmsg+0x5b/0x60\n____sys_sendmsg+0x1f2/0x260\n___sys_sendmsg+0x7c/0xc0\n__sys_sendmsg+0x57/0xa0\ndo_syscall_64+0x3a/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7efdc8031338\nCode: 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\nRSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 0000000061b37a97 RCX: 00007efdc8031338\nRDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003\nRBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940\nR10: 000000000000000c R11: 0000000000000246 R12: 0000000000000001\nR13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000\n</TASK>\nModules 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 ]---\nRIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47\nCode: 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\nRSP: 0018:ffffae46807a3888 EFLAGS: 00010246\nRAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202\nRDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff\nRBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff\nR10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800\nR13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400\nFS: 00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000000\n---truncated---", "A vulnerability was found in the Linux kernel's net/sched component in the sch_ets.c file, where idle classes were incorrectly removed from the round-robin list. This issue arises when the queue length is not properly checked, potentially leading to a use-after-free situation in net/sched that results in kernel crashes."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-47595", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47595\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47595\nhttps://lore.kernel.org/linux-cve-announce/2024061920-CVE-2021-47595-e9f3@gregkh/T"], "threat_severity": "Moderate"}

{}