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vuln-cve/data/2021/47xxx/CVE-2021-47557.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2021-47557",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-24T15:02:54.834Z",
"datePublished": "2024-05-24T15:09:58.655Z",
"dateUpdated": "2026-05-11T13:56:55.850Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T13:56:55.850Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_ets: don't peek at classes beyond 'nbands'\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's possible to see a NULL dereference crash, caused by the\nattempt to call cl->qdisc->ops->peek(cl->qdisc) when cl->qdisc 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 <48> 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 <TASK>\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 <53> 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 </TASK>\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 'alist' 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 'nbands' 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."
}
],
"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": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
"lessThan": "ae2659d2c670252759ee9c823c4e039c0e05a6f2",
"status": "affected",
"versionType": "git"
},
{
"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
"lessThan": "e25bdbc7e951ae5728fee1f4c09485df113d013c",
"status": "affected",
"versionType": "git"
},
{
"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33",
"lessThan": "de6d25924c2a8c2988c6a385990cafbe742061bf",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/sch_ets.c"
],
"versions": [
{
"version": "5.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.83",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.6",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.16",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.6",
"versionEndExcluding": "5.10.83"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.6",
"versionEndExcluding": "5.15.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.6",
"versionEndExcluding": "5.16"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2"
},
{
"url": "https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c"
},
{
"url": "https://git.kernel.org/stable/c/de6d25924c2a8c2988c6a385990cafbe742061bf"
}
],
"title": "net/sched: sch_ets: don't peek at classes beyond 'nbands'",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CISA ADP Vulnrichment",
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2021-47557",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-05-24T19:15:45.533433Z"
}
}
}
],
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2024-06-04T17:14:22.387Z"
}
},
{
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2024-08-04T05:39:59.828Z"
},
"title": "CVE Program Container",
"references": [
{
"url": "https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2",
"tags": [
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]
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{
"url": "https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c",
"tags": [
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"tags": [
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}
}
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