CVE-2021-47572 (GCVE-0-2021-47572)
Vulnerability from cvelistv5 – Published: 2024-05-24 15:12 – Updated: 2026-05-11 13:57
VLAI
EPSS
VEX
Title
net: nexthop: fix null pointer dereference when IPv6 is not enabled
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: nexthop: fix null pointer dereference when IPv6 is not enabled
When we try to add an IPv6 nexthop and IPv6 is not enabled
(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path
of nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug
has been present since the beginning of IPv6 nexthop gateway support.
Commit 1aefd3de7bc6 ("ipv6: Add fib6_nh_init and release to stubs") tells
us that only fib6_nh_init has a dummy stub because fib6_nh_release should
not be called if fib6_nh_init returns an error, but the commit below added
a call to ipv6_stub->fib6_nh_release in its error path. To fix it return
the dummy stub's -EAFNOSUPPORT error directly without calling
ipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.
[1]
Output is a bit truncated, but it clearly shows the error.
BUG: kernel NULL pointer dereference, address: 000000000000000000
#PF: supervisor instruction fetch in kernel modede
#PF: error_code(0x0010) - not-present pagege
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP NOPTI
CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac
RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860
RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000
R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f
R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840
FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0
Call Trace:
<TASK>
nh_create_ipv6+0xed/0x10c
rtm_new_nexthop+0x6d7/0x13f3
? check_preemption_disabled+0x3d/0xf2
? lock_is_held_type+0xbe/0xfd
rtnetlink_rcv_msg+0x23f/0x26a
? check_preemption_disabled+0x3d/0xf2
? rtnl_calcit.isra.0+0x147/0x147
netlink_rcv_skb+0x61/0xb2
netlink_unicast+0x100/0x187
netlink_sendmsg+0x37f/0x3a0
? netlink_unicast+0x187/0x187
sock_sendmsg_nosec+0x67/0x9b
____sys_sendmsg+0x19d/0x1f9
? copy_msghdr_from_user+0x4c/0x5e
? rcu_read_lock_any_held+0x2a/0x78
___sys_sendmsg+0x6c/0x8c
? asm_sysvec_apic_timer_interrupt+0x12/0x20
? lockdep_hardirqs_on+0xd9/0x102
? sockfd_lookup_light+0x69/0x99
__sys_sendmsg+0x50/0x6e
do_syscall_64+0xcb/0xf2
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f98dea28914
Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53
RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e
RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914
RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008
R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001
R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0
</TASK>
Modules linked in: bridge stp llc bonding virtio_net
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:35 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
53010f991a9f5e4ed2db705ddde6ff32709192a2 , < 7b6f44856da5ba0b1aa61403eb9fddd272156503
(git)
Affected: 53010f991a9f5e4ed2db705ddde6ff32709192a2 , < b70ff391deeec35cdd8a05f5f63f5fe28bc4f225 (git) Affected: 53010f991a9f5e4ed2db705ddde6ff32709192a2 , < 39509d76a9a3d02f379d52cb4b1449469c56c0e0 (git) Affected: 53010f991a9f5e4ed2db705ddde6ff32709192a2 , < 1c743127cc54b112b155f434756bd4b5fa565a99 (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.4.163 , ≤ 5.4.* (semver) Unaffected: 5.10.83 , ≤ 5.10.* (semver) Unaffected: 5.15.6 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\n\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we\u0027ll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub-\u003efib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub-\u003efib6_nh_release in its error path. To fix it return\nthe dummy stub\u0027s -EAFNOSUPPORT error directly without calling\nipv6_stub-\u003efib6_nh_release in nh_create_ipv6()\u0027s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n \u003cTASK\u003e\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n \u003c/TASK\u003e\n Modules linked in: bridge stp llc bonding virtio_net"
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{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: nexthop: corrige la desreferencia del puntero nulo cuando IPv6 no est\u00e1 habilitado Cuando intentamos agregar un nexthop IPv6 y IPv6 no est\u00e1 habilitado (!CONFIG_IPV6) alcanzaremos una desreferencia del puntero NULL [1] en la ruta de error de nh_create_ipv6() debido a la llamada a ipv6_stub-\u0026gt;fib6_nh_release. El error ha estado presente desde el comienzo del soporte de la puerta de enlace IPv6 nexthop. El commit 1aefd3de7bc6 (\"ipv6: Agregar fib6_nh_init y liberar a los stubs\") nos dice que solo fib6_nh_init tiene un stub ficticio porque no se debe llamar a fib6_nh_release si fib6_nh_init devuelve un error, pero el commit a continuaci\u00f3n agreg\u00f3 una llamada a ipv6_stub-\u0026gt;fib6_nh_release en su error camino. Para solucionarlo, devuelva el error -EAFNOSUPPORT del c\u00f3digo auxiliar ficticio directamente sin llamar a ipv6_stub-\u0026gt;fib6_nh_release en la ruta de error de nh_create_ipv6(). [1] La salida est\u00e1 un poco truncada, pero muestra claramente el error. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000000 #PF: b\u00fasqueda de instrucciones del supervisor en modo kernel #PF: c\u00f3digo_error(0x0010) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0010 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 638 Comm: ip Kdump: cargado No contaminado 5.16.0-rc1+ #446 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 01/04/2014 RIP: 0010:0x0 C\u00f3digo: No se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en RIP 0xffffffffffffffd6. RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 00000000000000000 RDX: 0000000000000000 RSI: 000000000000000 RDI: ffff8881008a2860 RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 00000000000000000 R10: ffff888109f5b978 R11: 9f5b948 R12: 00000000ffffff9f R13: ffff8881008a2a80 R14 : ffff8881008a2860 R15: ffff8881008a2840 FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0 Seguimiento de llamadas: nh_create_ipv6+0xed /0x10c rtm_new_nexthop+0x6d7/0x13f3 ? check_preemption_disabled+0x3d/0xf2? lock_is_held_type+0xbe/0xfd rtnetlink_rcv_msg+0x23f/0x26a? check_preemption_disabled+0x3d/0xf2? rtnl_calcit.isra.0+0x147/0x147 netlink_rcv_skb+0x61/0xb2 netlink_unicast+0x100/0x187 netlink_sendmsg+0x37f/0x3a0 ? netlink_unicast+0x187/0x187 sock_sendmsg_nosec+0x67/0x9b ____sys_sendmsg+0x19d/0x1f9 ? copy_msghdr_from_user+0x4c/0x5e? rcu_read_lock_any_held+0x2a/0x78 ___sys_sendmsg+0x6c/0x8c? asm_sysvec_apic_timer_interrupt+0x12/0x20? lockdep_hardirqs_on+0xd9/0x102? sockfd_lookup_light+0x69/0x99 __sys_sendmsg+0x50/0x6e do_syscall_64+0xcb/0xf2 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f98dea28914 C\u00f3digo: 00 f7 d8 64 89 02 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 \u0026lt;48\u0026gt; 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53 RSP: :00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914 RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008 R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000001 R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0 \u0026lt; /TASK\u0026gt; M\u00f3dulos vinculados en: bridge stp llc bonding virtio_net"
}
],
"id": "CVE-2021-47572",
"lastModified": "2024-11-21T06:36:34.947",
"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"
}
]
},
"published": "2024-05-24T15:15:22.887",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv4/nexthop.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7b6f44856da5ba0b1aa61403eb9fddd272156503",
"status": "affected",
"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2",
"versionType": "git"
},
{
"lessThan": "b70ff391deeec35cdd8a05f5f63f5fe28bc4f225",
"status": "affected",
"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2",
"versionType": "git"
},
{
"lessThan": "39509d76a9a3d02f379d52cb4b1449469c56c0e0",
"status": "affected",
"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2",
"versionType": "git"
},
{
"lessThan": "1c743127cc54b112b155f434756bd4b5fa565a99",
"status": "affected",
"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/nexthop.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.163",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.83",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.16",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "755F3E83-05A5-403D-A6B2-ED9DE8B0F69B",
"versionEndExcluding": "5.4.163",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D4843826-EA9A-472B-82EC-B9E4FD4149AD",
"versionEndExcluding": "5.10.83",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "990C08FB-0121-4296-896F-556312F8FF3B",
"versionEndExcluding": "5.15.6",
"versionStartIncluding": "5.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\n\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we\u0027ll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub-\u003efib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub-\u003efib6_nh_release in its error path. To fix it return\nthe dummy stub\u0027s -EAFNOSUPPORT error directly without calling\nipv6_stub-\u003efib6_nh_release in nh_create_ipv6()\u0027s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n \u003cTASK\u003e\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n \u003c/TASK\u003e\n Modules linked in: bridge stp llc bonding virtio_net"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: nexthop: corrige la desreferencia del puntero nulo cuando IPv6 no est\u00e1 habilitado Cuando intentamos agregar un nexthop IPv6 y IPv6 no est\u00e1 habilitado (!CONFIG_IPV6) alcanzaremos una desreferencia del puntero NULL [1] en la ruta de error de nh_create_ipv6() debido a la llamada a ipv6_stub-\u0026gt;fib6_nh_release. El error ha estado presente desde el comienzo del soporte de la puerta de enlace IPv6 nexthop. El commit 1aefd3de7bc6 (\"ipv6: Agregar fib6_nh_init y liberar a los stubs\") nos dice que solo fib6_nh_init tiene un stub ficticio porque no se debe llamar a fib6_nh_release si fib6_nh_init devuelve un error, pero el commit a continuaci\u00f3n agreg\u00f3 una llamada a ipv6_stub-\u0026gt;fib6_nh_release en su error camino. Para solucionarlo, devuelva el error -EAFNOSUPPORT del c\u00f3digo auxiliar ficticio directamente sin llamar a ipv6_stub-\u0026gt;fib6_nh_release en la ruta de error de nh_create_ipv6(). [1] La salida est\u00e1 un poco truncada, pero muestra claramente el error. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000000 #PF: b\u00fasqueda de instrucciones del supervisor en modo kernel #PF: c\u00f3digo_error(0x0010) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0010 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 638 Comm: ip Kdump: cargado No contaminado 5.16.0-rc1+ #446 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 01/04/2014 RIP: 0010:0x0 C\u00f3digo: No se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en RIP 0xffffffffffffffd6. RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 00000000000000000 RDX: 0000000000000000 RSI: 000000000000000 RDI: ffff8881008a2860 RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 00000000000000000 R10: ffff888109f5b978 R11: 9f5b948 R12: 00000000ffffff9f R13: ffff8881008a2a80 R14 : ffff8881008a2860 R15: ffff8881008a2840 FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0 Seguimiento de llamadas: nh_create_ipv6+0xed /0x10c rtm_new_nexthop+0x6d7/0x13f3 ? check_preemption_disabled+0x3d/0xf2? lock_is_held_type+0xbe/0xfd rtnetlink_rcv_msg+0x23f/0x26a? check_preemption_disabled+0x3d/0xf2? rtnl_calcit.isra.0+0x147/0x147 netlink_rcv_skb+0x61/0xb2 netlink_unicast+0x100/0x187 netlink_sendmsg+0x37f/0x3a0 ? netlink_unicast+0x187/0x187 sock_sendmsg_nosec+0x67/0x9b ____sys_sendmsg+0x19d/0x1f9 ? copy_msghdr_from_user+0x4c/0x5e? rcu_read_lock_any_held+0x2a/0x78 ___sys_sendmsg+0x6c/0x8c? asm_sysvec_apic_timer_interrupt+0x12/0x20? lockdep_hardirqs_on+0xd9/0x102? sockfd_lookup_light+0x69/0x99 __sys_sendmsg+0x50/0x6e do_syscall_64+0xcb/0xf2 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f98dea28914 C\u00f3digo: 00 f7 d8 64 89 02 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 \u0026lt;48\u0026gt; 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53 RSP: :00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914 RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008 R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000001 R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0 \u0026lt; /TASK\u0026gt; M\u00f3dulos vinculados en: bridge stp llc bonding virtio_net"
}
],
"id": "CVE-2021-47572",
"lastModified": "2026-06-17T04:17:47.710",
"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-2021-47572",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:35:07.855330Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-24T15:15:22.887",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"
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"url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"
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"Patch"
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"url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"
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{
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"url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T13:57:45+00:00",
"cve": "CVE-2021-47572",
"id": "CVE-2021-47572",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:fixed": "324",
"product_status:known_affected": "22",
"product_status:known_not_affected": "114",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: nexthop: fix null pointer dereference when IPv6 is not enabled",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47572.json",
"version": "3"
},
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"current_release_date": "2026-09-11T02:36:58Z",
"cve": "CVE-2021-47572",
"id": "CVE-2021-47572",
"initial_release_date": "2024-05-28T03:32:34Z",
"product_status:known_affected": "471",
"product_status:known_not_affected": "224",
"product_status:recommended": "320",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-47572",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47572.json",
"version": "59"
},
"vulnrichment": {
"containers": {
"adp": [
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"providerMetadata": {
"dateUpdated": "2024-08-04T05:39:59.779Z",
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"title": "CVE Program Container"
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"id": "CVE-2021-47572",
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"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:35:07.855330Z",
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"vendor": "Linux",
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"version": "0",
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{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
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{
"lessThanOrEqual": "5.10.*",
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"version": "5.10.83",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.6",
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},
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"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.16",
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\n\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we\u0027ll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub-\u003efib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub-\u003efib6_nh_release in its error path. To fix it return\nthe dummy stub\u0027s -EAFNOSUPPORT error directly without calling\nipv6_stub-\u003efib6_nh_release in nh_create_ipv6()\u0027s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n \u003cTASK\u003e\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n \u003c/TASK\u003e\n Modules linked in: bridge stp llc bonding virtio_net"
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"title": "net: nexthop: fix null pointer dereference when IPv6 is not enabled",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2021-47572",
"datePublished": "2024-05-24T15:12:58.397Z",
"dateReserved": "2024-05-24T15:11:00.729Z",
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"dataType": "CVE_RECORD",
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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