CVE-2024-56693
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-56693
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-56693.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-56693
- Downstream
- Related
- Published
- 2024-12-28T09:46:18Z
- Modified
- 2025-10-17T19:45:58.507968Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- brd: defer automatic disk creation until module initialization succeeds
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
brd: defer automatic disk creation until module initialization succeeds
My colleague Wupeng found the following problems during fault injection:
BUG: unable to handle page fault for address: fffffbfff809d073 PGD 6e648067 P4D 123ec8067 PUD 123ec4067 PMD 100e38067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 5 UID: 0 PID: 755 Comm: modprobe Not tainted 6.12.0-rc3+ #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:_asanload8+0x4c/0xa0 ... Call Trace: <TASK> blkdevputwhole+0x41/0x70 bdevrelease+0x1a3/0x250 blkdevrelease+0x11/0x20 _fput+0x1d7/0x4a0 taskworkrun+0xfc/0x180 syscallexittousermode+0x1de/0x1f0 dosyscall64+0x6b/0x170 entrySYSCALL64after_hwframe+0x76/0x7e
loopinit() is calling loopadd() after _registerblkdev() succeeds and is ignoring diskadd() failure from loopadd(), for loopadd() failure is not fatal and successfully created disks are already visible to bdevopen().
brdinit() is currently calling brdalloc() before _registerblkdev() succeeds and is releasing successfully created disks when brd_init() returns an error. This can cause UAF for the latter two case:
case 1: T1: modprobe brd brdinit brdalloc(0) // success adddisk diskscanpartitions bdevfileopenbydev // alloc file fput // won't free until back to userspace brdalloc(1) // failed since mem alloc error inject // error path for modprobe will release code segment // back to userspace _fput blkdevrelease bdevrelease blkdevputwhole bdev->bddisk->fops->release // fops is freed now, UAF!
case 2: T1: T2: modprobe brd brdinit brdalloc(0) // success open(/dev/ram0) brd_alloc(1) // fail // error path for modprobe
close(/dev/ram0) ... /* UAF! */ bdev->bd_disk->fops->releaseFix this problem by following what loopinit() does. Besides, reintroduce brddevicesmutex to help serialize modifications to brdlist.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/259bf925583ec9e3781df778cadf00594095090d
- https://git.kernel.org/stable/c/410896624db639500f24f46478b4bfa05c76bf56
- https://git.kernel.org/stable/c/41219c147df8bbd6591f59af5d695fb6c9a1cbff
- https://git.kernel.org/stable/c/63dfd728b30f79495dacc886127695a379805152
- https://git.kernel.org/stable/c/826cc42adf44930a633d11a5993676d85ddb0842
- https://git.kernel.org/stable/c/c0c2744cd2939ec5999c51dbaf2af16886548b7b
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixed41219c147df8bbd6591f59af5d695fb6c9a1cbff
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixed259bf925583ec9e3781df778cadf00594095090d
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixed410896624db639500f24f46478b4bfa05c76bf56
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixedc0c2744cd2939ec5999c51dbaf2af16886548b7b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixed63dfd728b30f79495dacc886127695a379805152
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f9b348cb5e94259acdcbafbcaed55d3bb515304Fixed826cc42adf44930a633d11a5993676d85ddb0842
Affected versions
v5.*
v5.13
v5.13-rc4
v5.13-rc5
v5.13-rc6
v5.13-rc7
v5.14
v5.14-rc1
v5.14-rc2
v5.14-rc3
v5.14-rc4
v5.14-rc5
v5.14-rc6
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.15.1
v5.15.10
v5.15.100
v5.15.101
v5.15.102
v5.15.103
v5.15.104
v5.15.105
v5.15.106
v5.15.107
v5.15.108
v5.15.109
v5.15.11
v5.15.110
v5.15.111
v5.15.112
v5.15.113
v5.15.114
v5.15.115
v5.15.116
v5.15.117
v5.15.118
v5.15.119
v5.15.12
v5.15.120
v5.15.121
v5.15.122
v5.15.123
v5.15.124
v5.15.125
v5.15.126
v5.15.127
v5.15.128
v5.15.129
v5.15.13
v5.15.130
v5.15.131
v5.15.132
v5.15.133
v5.15.134
v5.15.135
v5.15.136
v5.15.137
v5.15.138
v5.15.139
v5.15.14
v5.15.140
v5.15.141
v5.15.142
v5.15.143
v5.15.144
v5.15.145
v5.15.146
v5.15.147
v5.15.148
v5.15.149
v5.15.15
v5.15.150
v5.15.151
v5.15.152
v5.15.153
v5.15.154
v5.15.155
v5.15.156
v5.15.157
v5.15.158
v5.15.159
v5.15.16
v5.15.160
v5.15.161
v5.15.162
v5.15.163
v5.15.164
v5.15.165
v5.15.166
v5.15.167
v5.15.168
v5.15.169
v5.15.17
v5.15.170
v5.15.171
v5.15.172
v5.15.173
v5.15.18
v5.15.19
v5.15.2
v5.15.20
v5.15.21
v5.15.22
v5.15.23
v5.15.24
v5.15.25
v5.15.26
v5.15.27
v5.15.28
v5.15.29
v5.15.3
v5.15.30
v5.15.31
v5.15.32
v5.15.33
v5.15.34
v5.15.35
v5.15.36
v5.15.37
v5.15.38
v5.15.39
v5.15.4
v5.15.40
v5.15.41
v5.15.42
v5.15.43
v5.15.44
v5.15.45
v5.15.46
v5.15.47
v5.15.48
v5.15.49
v5.15.5
v5.15.50
v5.15.51
v5.15.52
v5.15.53
v5.15.54
v5.15.55
v5.15.56
v5.15.57
v5.15.58
v5.15.59
v5.15.6
v5.15.60
v5.15.61
v5.15.62
v5.15.63
v5.15.64
v5.15.65
v5.15.66
v5.15.67
v5.15.68
v5.15.69
v5.15.7
v5.15.70
v5.15.71
v5.15.72
v5.15.73
v5.15.74
v5.15.75
v5.15.76
v5.15.77
v5.15.78
v5.15.79
v5.15.8
v5.15.80
v5.15.81
v5.15.82
v5.15.83
v5.15.84
v5.15.85
v5.15.86
v5.15.87
v5.15.88
v5.15.89
v5.15.9
v5.15.90
v5.15.91
v5.15.92
v5.15.93
v5.15.94
v5.15.95
v5.15.96
v5.15.97
v5.15.98
v5.15.99
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.1.1
v6.1.10
v6.1.100
v6.1.101
v6.1.102
v6.1.103
v6.1.104
v6.1.105
v6.1.106
v6.1.107
v6.1.108
v6.1.109
v6.1.11
v6.1.110
v6.1.111
v6.1.112
v6.1.113
v6.1.114
v6.1.115
v6.1.116
v6.1.117
v6.1.118
v6.1.119
v6.1.12
v6.1.13
v6.1.14
v6.1.15
v6.1.16
v6.1.17
v6.1.18
v6.1.19
v6.1.2
v6.1.20
v6.1.21
v6.1.22
v6.1.23
v6.1.24
v6.1.25
v6.1.26
v6.1.27
v6.1.28
v6.1.29
v6.1.3
v6.1.30
v6.1.31
v6.1.32
v6.1.33
v6.1.34
v6.1.35
v6.1.36
v6.1.37
v6.1.38
v6.1.39
v6.1.4
v6.1.40
v6.1.41
v6.1.42
v6.1.43
v6.1.44
v6.1.45
v6.1.46
v6.1.47
v6.1.48
v6.1.49
v6.1.5
v6.1.50
v6.1.51
v6.1.52
v6.1.53
v6.1.54
v6.1.55
v6.1.56
v6.1.57
v6.1.58
v6.1.59
v6.1.6
v6.1.60
v6.1.61
v6.1.62
v6.1.63
v6.1.64
v6.1.65
v6.1.66
v6.1.67
v6.1.68
v6.1.69
v6.1.7
v6.1.70
v6.1.71
v6.1.72
v6.1.73
v6.1.74
v6.1.75
v6.1.76
v6.1.77
v6.1.78
v6.1.79
v6.1.8
v6.1.80
v6.1.81
v6.1.82
v6.1.83
v6.1.84
v6.1.85
v6.1.86
v6.1.87
v6.1.88
v6.1.89
v6.1.9
v6.1.90
v6.1.91
v6.1.92
v6.1.93
v6.1.94
v6.1.95
v6.1.96
v6.1.97
v6.1.98
v6.1.99
v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.11.1
v6.11.10
v6.11.2
v6.11.3
v6.11.4
v6.11.5
v6.11.6
v6.11.7
v6.11.8
v6.11.9
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.47
v6.6.48
v6.6.49
v6.6.5
v6.6.50
v6.6.51
v6.6.52
v6.6.53
v6.6.54
v6.6.55
v6.6.56
v6.6.57
v6.6.58
v6.6.59
v6.6.6
v6.6.60
v6.6.61
v6.6.62
v6.6.63
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
Database specific
vanir_signatures
[
{
"id": "CVE-2024-56693-02ca3da0",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_init"
},
"digest": {
"function_hash": "65140280053406527188974264111098167856",
"length": 445.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@41219c147df8bbd6591f59af5d695fb6c9a1cbff"
},
{
"id": "CVE-2024-56693-09204008",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_alloc"
},
"digest": {
"function_hash": "238124805543385184683515901400989636266",
"length": 1354.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c0c2744cd2939ec5999c51dbaf2af16886548b7b"
},
{
"id": "CVE-2024-56693-18c2082a",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_alloc"
},
"digest": {
"function_hash": "48935281472839478486018644330317846278",
"length": 1284.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@410896624db639500f24f46478b4bfa05c76bf56"
},
{
"id": "CVE-2024-56693-3cee1d5a",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"target": {
"file": "drivers/block/brd.c"
},
"digest": {
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"threshold": 0.9
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@259bf925583ec9e3781df778cadf00594095090d"
},
{
"id": "CVE-2024-56693-3f1a59bb",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_alloc"
},
"digest": {
"function_hash": "21601300339180363068592846896010947166",
"length": 1364.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@41219c147df8bbd6591f59af5d695fb6c9a1cbff"
},
{
"id": "CVE-2024-56693-41ad756d",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_init"
},
"digest": {
"function_hash": "65140280053406527188974264111098167856",
"length": 445.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c0c2744cd2939ec5999c51dbaf2af16886548b7b"
},
{
"id": "CVE-2024-56693-48828b06",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"target": {
"file": "drivers/block/brd.c",
"function": "brd_init"
},
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