cve-2021-47557
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2024-11-04 12:08
Severity ?
EPSS score ?
Summary
net/sched: sch_ets: don't peek at classes beyond 'nbands'
References
{
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"id": "CVE-2021-47557",
"options": [
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"Exploitation": "none"
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"Automatable": "no"
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"role": "CISA Coordinator",
"timestamp": "2024-05-24T19:15:45.533433Z",
"version": "2.0.3"
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"dateUpdated": "2024-08-04T05:39:59.828Z",
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"cna": {
"affected": [
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sched/sch_ets.c"
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versions": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "0",
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"status": "unaffected",
"version": "5.10.83",
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"status": "unaffected",
"version": "5.15.6",
"versionType": "semver"
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"version": "5.16",
"versionType": "original_commit_for_fix"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don\u0027t peek at classes beyond \u0027nbands\u0027\n\nwhen the number of DRR classes decreases, the round-robin active list can\ncontain elements that have already been freed in ets_qdisc_change(). As a\nconsequence, it\u0027s possible to see a NULL dereference crash, caused by the\nattempt to call cl-\u003eqdisc-\u003eops-\u003epeek(cl-\u003eqdisc) when cl-\u003eqdisc is NULL:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 1 PID: 910 Comm: mausezahn Not tainted 5.16.0-rc1+ #475\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n RIP: 0010:ets_qdisc_dequeue+0x129/0x2c0 [sch_ets]\n Code: c5 01 41 39 ad e4 02 00 00 0f 87 18 ff ff ff 49 8b 85 c0 02 00 00 49 39 c4 0f 84 ba 00 00 00 49 8b ad c0 02 00 00 48 8b 7d 10 \u003c48\u003e 8b 47 18 48 8b 40 38 0f ae e8 ff d0 48 89 c3 48 85 c0 0f 84 9d\n RSP: 0000:ffffbb36c0b5fdd8 EFLAGS: 00010287\n RAX: ffff956678efed30 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000002 RSI: ffffffff9b938dc9 RDI: 0000000000000000\n RBP: ffff956678efed30 R08: e2f3207fe360129c R09: 0000000000000000\n R10: 0000000000000001 R11: 0000000000000001 R12: ffff956678efeac0\n R13: ffff956678efe800 R14: ffff956611545000 R15: ffff95667ac8f100\n FS: 00007f2aa9120740(0000) GS:ffff95667b800000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000018 CR3: 000000011070c000 CR4: 0000000000350ee0\n Call Trace:\n \u003cTASK\u003e\n qdisc_peek_dequeued+0x29/0x70 [sch_ets]\n tbf_dequeue+0x22/0x260 [sch_tbf]\n __qdisc_run+0x7f/0x630\n net_tx_action+0x290/0x4c0\n __do_softirq+0xee/0x4f8\n irq_exit_rcu+0xf4/0x130\n sysvec_apic_timer_interrupt+0x52/0xc0\n asm_sysvec_apic_timer_interrupt+0x12/0x20\n RIP: 0033:0x7f2aa7fc9ad4\n Code: b9 ff ff 48 8b 54 24 18 48 83 c4 08 48 89 ee 48 89 df 5b 5d e9 ed fc ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa \u003c53\u003e 48 83 ec 10 48 8b 05 10 64 33 00 48 8b 00 48 85 c0 0f 85 84 00\n RSP: 002b:00007ffe5d33fab8 EFLAGS: 00000202\n RAX: 0000000000000002 RBX: 0000561f72c31460 RCX: 0000561f72c31720\n RDX: 0000000000000002 RSI: 0000561f72c31722 RDI: 0000561f72c31720\n RBP: 000000000000002a R08: 00007ffe5d33fa40 R09: 0000000000000014\n R10: 0000000000000000 R11: 0000000000000246 R12: 0000561f7187e380\n R13: 0000000000000000 R14: 0000000000000000 R15: 0000561f72c31460\n \u003c/TASK\u003e\n Modules linked in: sch_ets sch_tbf dummy rfkill iTCO_wdt intel_rapl_msr iTCO_vendor_support intel_rapl_common joydev virtio_balloon lpc_ich i2c_i801 i2c_smbus pcspkr ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel ahci libahci ghash_clmulni_intel serio_raw libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod\n CR2: 0000000000000018\n\nEnsuring that \u0027alist\u0027 was never zeroed [1] was not sufficient, we need to\nremove from the active list those elements that are no more SP nor DRR.\n\n[1] https://lore.kernel.org/netdev/60d274838bf09777f0371253416e8af71360bc08.1633609148.git.dcaratti@redhat.com/\n\nv3: fix race between ets_qdisc_change() and ets_qdisc_dequeue() delisting\n DRR classes beyond \u0027nbands\u0027 in ets_qdisc_change() with the qdisc lock\n acquired, thanks to Cong Wang.\n\nv2: when a NULL qdisc is found in the DRR active list, try to dequeue skb\n from the next list item."
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"dateUpdated": "2024-11-04T12:08:10.995Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2"
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"url": "https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c"
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"title": "net/sched: sch_ets: don\u0027t peek at classes beyond \u0027nbands\u0027",
"x_generator": {
"engine": "bippy-9e1c9544281a"
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47557",
"datePublished": "2024-05-24T15:09:58.655Z",
"dateReserved": "2024-05-24T15:02:54.834Z",
"dateUpdated": "2024-11-04T12:08:10.995Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2021-47557\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-24T15:15:20.393\",\"lastModified\":\"2024-05-24T18:09:20.027\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: sch_ets: don\u0027t peek at classes beyond \u0027nbands\u0027\\n\\nwhen the number of DRR classes decreases, the round-robin active list can\\ncontain elements that have already been freed in ets_qdisc_change(). As a\\nconsequence, it\u0027s possible to see a NULL dereference crash, caused by the\\nattempt to call cl-\u003eqdisc-\u003eops-\u003epeek(cl-\u003eqdisc) when cl-\u003eqdisc is NULL:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000018\\n #PF: supervisor read access in kernel mode\\n #PF: error_code(0x0000) - not-present page\\n PGD 0 P4D 0\\n Oops: 0000 [#1] PREEMPT SMP NOPTI\\n CPU: 1 PID: 910 Comm: mausezahn Not tainted 5.16.0-rc1+ #475\\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\\n RIP: 0010:ets_qdisc_dequeue+0x129/0x2c0 [sch_ets]\\n Code: c5 01 41 39 ad e4 02 00 00 0f 87 18 ff ff ff 49 8b 85 c0 02 00 00 49 39 c4 0f 84 ba 00 00 00 49 8b ad c0 02 00 00 48 8b 7d 10 \u003c48\u003e 8b 47 18 48 8b 40 38 0f ae e8 ff d0 48 89 c3 48 85 c0 0f 84 9d\\n RSP: 0000:ffffbb36c0b5fdd8 EFLAGS: 00010287\\n RAX: ffff956678efed30 RBX: 0000000000000000 RCX: 0000000000000000\\n RDX: 0000000000000002 RSI: ffffffff9b938dc9 RDI: 0000000000000000\\n RBP: ffff956678efed30 R08: e2f3207fe360129c R09: 0000000000000000\\n R10: 0000000000000001 R11: 0000000000000001 R12: ffff956678efeac0\\n R13: ffff956678efe800 R14: ffff956611545000 R15: ffff95667ac8f100\\n FS: 00007f2aa9120740(0000) GS:ffff95667b800000(0000) knlGS:0000000000000000\\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000000018 CR3: 000000011070c000 CR4: 0000000000350ee0\\n Call Trace:\\n \u003cTASK\u003e\\n qdisc_peek_dequeued+0x29/0x70 [sch_ets]\\n tbf_dequeue+0x22/0x260 [sch_tbf]\\n __qdisc_run+0x7f/0x630\\n net_tx_action+0x290/0x4c0\\n __do_softirq+0xee/0x4f8\\n irq_exit_rcu+0xf4/0x130\\n sysvec_apic_timer_interrupt+0x52/0xc0\\n asm_sysvec_apic_timer_interrupt+0x12/0x20\\n RIP: 0033:0x7f2aa7fc9ad4\\n Code: b9 ff ff 48 8b 54 24 18 48 83 c4 08 48 89 ee 48 89 df 5b 5d e9 ed fc ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa \u003c53\u003e 48 83 ec 10 48 8b 05 10 64 33 00 48 8b 00 48 85 c0 0f 85 84 00\\n RSP: 002b:00007ffe5d33fab8 EFLAGS: 00000202\\n RAX: 0000000000000002 RBX: 0000561f72c31460 RCX: 0000561f72c31720\\n RDX: 0000000000000002 RSI: 0000561f72c31722 RDI: 0000561f72c31720\\n RBP: 000000000000002a R08: 00007ffe5d33fa40 R09: 0000000000000014\\n R10: 0000000000000000 R11: 0000000000000246 R12: 0000561f7187e380\\n R13: 0000000000000000 R14: 0000000000000000 R15: 0000561f72c31460\\n \u003c/TASK\u003e\\n Modules linked in: sch_ets sch_tbf dummy rfkill iTCO_wdt intel_rapl_msr iTCO_vendor_support intel_rapl_common joydev virtio_balloon lpc_ich i2c_i801 i2c_smbus pcspkr ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel ahci libahci ghash_clmulni_intel serio_raw libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod\\n CR2: 0000000000000018\\n\\nEnsuring that \u0027alist\u0027 was never zeroed [1] was not sufficient, we need to\\nremove from the active list those elements that are no more SP nor DRR.\\n\\n[1] https://lore.kernel.org/netdev/60d274838bf09777f0371253416e8af71360bc08.1633609148.git.dcaratti@redhat.com/\\n\\nv3: fix race between ets_qdisc_change() and ets_qdisc_dequeue() delisting\\n DRR classes beyond \u0027nbands\u0027 in ets_qdisc_change() with the qdisc lock\\n acquired, thanks to Cong Wang.\\n\\nv2: when a NULL qdisc is found in the DRR active list, try to dequeue skb\\n from the next list item.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: sch_ets: no mire las clases m\u00e1s all\u00e1 de \u0027nbands\u0027 cuando el n\u00famero de clases DRR disminuye, la lista activa por turnos puede contener elementos que ya han sido liberados en ets_qdisc_change(). Como consecuencia, es posible ver un bloqueo de desreferencia NULL, causado por el intento de llamar a cl-\u0026gt;qdisc-\u0026gt;ops-\u0026gt;peek(cl-\u0026gt;qdisc) cuando cl-\u0026gt;qdisc es NULL: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000018 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 910 Comm: mausezahn Not tainted 5.16 .0-rc1+ #475 Nombre de hardware: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 01/04/2014 RIP: 0010:ets_qdisc_dequeue+0x129/0x2c0 [sch_ets] C\u00f3digo: c5 01 41 39 ad e4 02 00 00 0f 87 18 ff ff ff 49 8b 85 c0 02 00 00 49 39 c4 0f 84 ba 00 00 00 49 8b ad c0 02 00 00 48 8b 7d 10 \u0026lt;48\u0026gt; 8b 47 48 8b 40 38 0f ae e8 ff d0 48 89 c3 48 85 c0 0f 84 9d RSP: 0000:ffffbb36c0b5fdd8 EFLAGS: 00010287 RAX: ffff956678efed30 RBX: 0000000000000000 RCX: 00000000000 00000 RDX: 0000000000000002 RSI: ffffffff9b938dc9 RDI: 0000000000000000 RBP: ffff956678efed30 R08: e2f3207fe360129c R09: 000000000000000000000 R10 : 0000000000000001 R11: 0000000000000001 R12: ffff956678efeac0 R13: ffff956678efe800 R14: ffff956611545000 R15: ffff95667ac8f100 FS: a9120740(0000) GS:ffff95667b800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 0000011070c000 CR4: 0000000000350ee0 Seguimiento de llamadas: qdisc_peek_dequeued+0x29/0x70 [sch_ets] tbf_dequeue+0x22/0x260 [sch_tbf] __qdisc_run+0x7f/0x630 net_tx_action+0x290/0x4c0 ee/0x4f8 irq_exit_rcu+0xf4/0x130 sysvec_apic_timer_interrupt+0x52/0xc0 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0033:0x7f2aa7fc9ad4 C\u00f3digo: b9 ff ff 48 8b 54 24 18 48 83 c4 08 48 89 ee 48 89 df 5b 5d e9 ed fc ff ff 0f 1f 0 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa \u0026lt;53\u0026gt; 48 83 ec 10 48 8b 05 10 64 33 00 48 8b 00 48 85 c0 0f 85 84 00 RSP: 002b:00007ffe5d33fab8 EFLAGS: 00000202 RAX: 0000002 RBX: 0000561f72c31460 RCX: 0000561f72c31720 RDX: 0000000000000002 RSI: 0000561f72c31722 RDI: 0000561f72c31720 RBP: 000000000000002a R08: 00007ffe5d33fa40 R09: 00000000000000014 R10: 0000000000000000 R11: 000000000000246 R12: 0000561f7187e380 R13: 0000000000000000 R14: 0000000000000000 R15: 0000561f72c31460 M\u00f3dulos vinculados en: sch_ets sch_tbf dummy matar iTCO_wdt intel_rapl_msr iTCO_vendor_support intel_rapl_common joydev virtio_balloon lpc_ich i2c_i801 i2c_smbus pcspkr ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel ahci libahci ghash_clmulni_intel serio_raw libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm _log dm_mod CR2: 0000000000000018 Asegurarse de que \u0027alist\u0027 nunca se pusiera a cero [1] no fue suficiente, debemos eliminarlo de la lista activa aquellos elementos que ya no son PS ni RRD. [1] https://lore.kernel.org/netdev/60d274838bf09777f0371253416e8af71360bc08.1633609148.git.dcaratti@redhat.com/ v3: corrige la ejecuci\u00f3n entre ets_qdisc_change() y ets_qdisc_dequeue() eliminando las clases de DRR m\u00e1s all\u00e1 de \u0027nbands\u0027 en c_cambio() con el bloqueo qdisc adquirido, gracias a Cong Wang. v2: cuando se encuentra una qdisc NULL en la lista activa de DRR, intente sacar de la cola a skb del siguiente elemento de la lista.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de6d25924c2a8c2988c6a385990cafbe742061bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.