gsd-2021-46981
Vulnerability from gsd
Modified
2024-02-28 06:03
Details
In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs will be 1 and
the pointers in nbd_device are still null. Disconnect
/dev/nbdX, then reference a null recv_workq. The
protection by config_refs in nbd_genl_disconnect is useless.
[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 656.368943] #PF: supervisor write access in kernel mode
[ 656.369844] #PF: error_code(0x0002) - not-present page
[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0
[ 656.371693] Oops: 0002 [#1] SMP
[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1
[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014
[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60
[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 <f0> 48 0f b1 55 d
[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246
[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020
[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318
[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40
[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00
[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000
[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0
[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 656.384927] Call Trace:
[ 656.385111] flush_workqueue+0x92/0x6c0
[ 656.385395] nbd_disconnect_and_put+0x81/0xd0
[ 656.385716] nbd_genl_disconnect+0x125/0x2a0
[ 656.386034] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0
[ 656.386422] genl_rcv_msg+0xfc/0x2b0
[ 656.386685] ? nbd_ioctl+0x490/0x490
[ 656.386954] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0
[ 656.387354] netlink_rcv_skb+0x62/0x180
[ 656.387638] genl_rcv+0x34/0x60
[ 656.387874] netlink_unicast+0x26d/0x590
[ 656.388162] netlink_sendmsg+0x398/0x6c0
[ 656.388451] ? netlink_rcv_skb+0x180/0x180
[ 656.388750] ____sys_sendmsg+0x1da/0x320
[ 656.389038] ? ____sys_recvmsg+0x130/0x220
[ 656.389334] ___sys_sendmsg+0x8e/0xf0
[ 656.389605] ? ___sys_recvmsg+0xa2/0xf0
[ 656.389889] ? handle_mm_fault+0x1671/0x21d0
[ 656.390201] __sys_sendmsg+0x6d/0xe0
[ 656.390464] __x64_sys_sendmsg+0x23/0x30
[ 656.390751] do_syscall_64+0x45/0x70
[ 656.391017] entry_SYSCALL_64_after_hwframe+0x44/0xa9
To fix it, just add if (nbd->recv_workq) to nbd_disconnect_and_put().
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-46981"
],
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: Fix NULL pointer in flush_workqueue\n\nOpen /dev/nbdX first, the config_refs will be 1 and\nthe pointers in nbd_device are still null. Disconnect\n/dev/nbdX, then reference a null recv_workq. The\nprotection by config_refs in nbd_genl_disconnect is useless.\n\n[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020\n[ 656.368943] #PF: supervisor write access in kernel mode\n[ 656.369844] #PF: error_code(0x0002) - not-present page\n[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0\n[ 656.371693] Oops: 0002 [#1] SMP\n[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1\n[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014\n[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60\n[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 \u003cf0\u003e 48 0f b1 55 d\n[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246\n[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020\n[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318\n[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40\n[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00\n[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000\n[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0\n[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 656.384927] Call Trace:\n[ 656.385111] flush_workqueue+0x92/0x6c0\n[ 656.385395] nbd_disconnect_and_put+0x81/0xd0\n[ 656.385716] nbd_genl_disconnect+0x125/0x2a0\n[ 656.386034] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0\n[ 656.386422] genl_rcv_msg+0xfc/0x2b0\n[ 656.386685] ? nbd_ioctl+0x490/0x490\n[ 656.386954] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0\n[ 656.387354] netlink_rcv_skb+0x62/0x180\n[ 656.387638] genl_rcv+0x34/0x60\n[ 656.387874] netlink_unicast+0x26d/0x590\n[ 656.388162] netlink_sendmsg+0x398/0x6c0\n[ 656.388451] ? netlink_rcv_skb+0x180/0x180\n[ 656.388750] ____sys_sendmsg+0x1da/0x320\n[ 656.389038] ? ____sys_recvmsg+0x130/0x220\n[ 656.389334] ___sys_sendmsg+0x8e/0xf0\n[ 656.389605] ? ___sys_recvmsg+0xa2/0xf0\n[ 656.389889] ? handle_mm_fault+0x1671/0x21d0\n[ 656.390201] __sys_sendmsg+0x6d/0xe0\n[ 656.390464] __x64_sys_sendmsg+0x23/0x30\n[ 656.390751] do_syscall_64+0x45/0x70\n[ 656.391017] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTo fix it, just add if (nbd-\u003erecv_workq) to nbd_disconnect_and_put().",
"id": "GSD-2021-46981",
"modified": "2024-02-28T06:03:57.312457Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
"cve.org": {
"CVE_data_meta": {
"ASSIGNER": "cve@kernel.org",
"ID": "CVE-2021-46981",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Linux",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_name": "e9e006f5fcf2",
"version_value": "1c4962df9388"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
"defaultStatus": "affected",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"lessThan": "5.4",
"status": "unaffected",
"version": "0",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.120",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.38",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.22",
"versionType": "custom"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.5",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
}
]
}
}
]
},
"vendor_name": "Linux"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: Fix NULL pointer in flush_workqueue\n\nOpen /dev/nbdX first, the config_refs will be 1 and\nthe pointers in nbd_device are still null. Disconnect\n/dev/nbdX, then reference a null recv_workq. The\nprotection by config_refs in nbd_genl_disconnect is useless.\n\n[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020\n[ 656.368943] #PF: supervisor write access in kernel mode\n[ 656.369844] #PF: error_code(0x0002) - not-present page\n[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0\n[ 656.371693] Oops: 0002 [#1] SMP\n[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1\n[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014\n[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60\n[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 \u003cf0\u003e 48 0f b1 55 d\n[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246\n[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020\n[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318\n[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40\n[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00\n[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000\n[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0\n[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 656.384927] Call Trace:\n[ 656.385111] flush_workqueue+0x92/0x6c0\n[ 656.385395] nbd_disconnect_and_put+0x81/0xd0\n[ 656.385716] nbd_genl_disconnect+0x125/0x2a0\n[ 656.386034] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0\n[ 656.386422] genl_rcv_msg+0xfc/0x2b0\n[ 656.386685] ? nbd_ioctl+0x490/0x490\n[ 656.386954] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0\n[ 656.387354] netlink_rcv_skb+0x62/0x180\n[ 656.387638] genl_rcv+0x34/0x60\n[ 656.387874] netlink_unicast+0x26d/0x590\n[ 656.388162] netlink_sendmsg+0x398/0x6c0\n[ 656.388451] ? netlink_rcv_skb+0x180/0x180\n[ 656.388750] ____sys_sendmsg+0x1da/0x320\n[ 656.389038] ? ____sys_recvmsg+0x130/0x220\n[ 656.389334] ___sys_sendmsg+0x8e/0xf0\n[ 656.389605] ? ___sys_recvmsg+0xa2/0xf0\n[ 656.389889] ? handle_mm_fault+0x1671/0x21d0\n[ 656.390201] __sys_sendmsg+0x6d/0xe0\n[ 656.390464] __x64_sys_sendmsg+0x23/0x30\n[ 656.390751] do_syscall_64+0x45/0x70\n[ 656.391017] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTo fix it, just add if (nbd-\u003erecv_workq) to nbd_disconnect_and_put()."
}
]
},
"generator": {
"engine": "bippy-c298863b1525"
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107"
},
{
"name": "https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43"
},
{
"name": "https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7"
},
{
"name": "https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc"
},
{
"name": "https://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390",
"refsource": "MISC",
"url": "https://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390"
}
]
}
},
"nvd.nist.gov": {
"cve": {
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: Fix NULL pointer in flush_workqueue\n\nOpen /dev/nbdX first, the config_refs will be 1 and\nthe pointers in nbd_device are still null. Disconnect\n/dev/nbdX, then reference a null recv_workq. The\nprotection by config_refs in nbd_genl_disconnect is useless.\n\n[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020\n[ 656.368943] #PF: supervisor write access in kernel mode\n[ 656.369844] #PF: error_code(0x0002) - not-present page\n[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0\n[ 656.371693] Oops: 0002 [#1] SMP\n[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1\n[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014\n[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60\n[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 \u003cf0\u003e 48 0f b1 55 d\n[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246\n[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020\n[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318\n[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40\n[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00\n[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000\n[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0\n[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 656.384927] Call Trace:\n[ 656.385111] flush_workqueue+0x92/0x6c0\n[ 656.385395] nbd_disconnect_and_put+0x81/0xd0\n[ 656.385716] nbd_genl_disconnect+0x125/0x2a0\n[ 656.386034] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0\n[ 656.386422] genl_rcv_msg+0xfc/0x2b0\n[ 656.386685] ? nbd_ioctl+0x490/0x490\n[ 656.386954] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0\n[ 656.387354] netlink_rcv_skb+0x62/0x180\n[ 656.387638] genl_rcv+0x34/0x60\n[ 656.387874] netlink_unicast+0x26d/0x590\n[ 656.388162] netlink_sendmsg+0x398/0x6c0\n[ 656.388451] ? netlink_rcv_skb+0x180/0x180\n[ 656.388750] ____sys_sendmsg+0x1da/0x320\n[ 656.389038] ? ____sys_recvmsg+0x130/0x220\n[ 656.389334] ___sys_sendmsg+0x8e/0xf0\n[ 656.389605] ? ___sys_recvmsg+0xa2/0xf0\n[ 656.389889] ? handle_mm_fault+0x1671/0x21d0\n[ 656.390201] __sys_sendmsg+0x6d/0xe0\n[ 656.390464] __x64_sys_sendmsg+0x23/0x30\n[ 656.390751] do_syscall_64+0x45/0x70\n[ 656.391017] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTo fix it, just add if (nbd-\u003erecv_workq) to nbd_disconnect_and_put()."
}
],
"id": "CVE-2021-46981",
"lastModified": "2024-02-28T14:06:45.783",
"metrics": {},
"published": "2024-02-28T09:15:37.320",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
}
}
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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.
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