CVE-2024-44946
- Source
- https://cve.org/CVERecord?id=CVE-2024-44946
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44946.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-44946
- Downstream
- Related
- Published
- 2024-08-31T13:22:47.250Z
- Modified
- 2026-03-23T05:06:08.249081102Z
- Summary
- kcm: Serialise kcm_sendmsg() for the same socket.
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
kcm: Serialise kcm_sendmsg() for the same socket.
syzkaller reported UAF in kcm_release(). [0]
The scenario is
Thread A builds a skb with MSGMORE and sets kcm->seqskb.
Thread A resumes building skb from kcm->seqskb but is blocked by skstreamwaitmemory()
Thread B calls sendmsg() concurrently, finishes building kcm->seq_skb and puts the skb to the write queue
Thread A faces an error and finally frees skb that is already in the write queue
kcm_release() does double-free the skb in the write queue
When a thread is building a MSG_MORE skb, another thread must not touch it.
Let's add a per-sk mutex and serialise kcm_sendmsg().
BUG: KASAN: slab-use-after-free in __skb_dequeue include/linux/skbuff.h:2385 [inline] BUG: KASAN: slab-use-after-free in __skbqueuepurge_reason include/linux/skbuff.h:3175 [inline] BUG: KASAN: slab-use-after-free in _skbqueuepurge include/linux/skbuff.h:3181 [inline] BUG: KASAN: slab-use-after-free in kcmrelease+0x170/0x4c8 net/kcm/kcmsock.c:1691 Read of size 8 at addr ffff0000ced0fc80 by task syz-executor329/6167
CPU: 1 PID: 6167 Comm: syz-executor329 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dumpbacktrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 showstack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dumpstack lib/dumpstack.c:88 [inline] dump_stacklvl+0xd0/0x124 lib/dumpstack.c:106 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0x178/0x518 mm/kasan/report.c:488 kasanreport+0xd8/0x138 mm/kasan/report.c:601 __asanreportload8noabort+0x20/0x2c mm/kasan/reportgeneric.c:381 __skb_unlink include/linux/skbuff.h:2366 [inline] __skb_dequeue include/linux/skbuff.h:2385 [inline] __skbqueuepurge_reason include/linux/skbuff.h:3175 [inline] __skbqueuepurge include/linux/skbuff.h:3181 [inline] kcm_release+0x170/0x4c8 net/kcm/kcmsock.c:1691 __sockrelease net/socket.c:659 [inline] sockclose+0xa4/0x1e8 net/socket.c:1421 __fput+0x30c/0x738 fs/file_table.c:376 ___fput+0x20/0x30 fs/filetable.c:404 taskworkrun+0x230/0x2e0 kernel/taskwork.c:180 exittaskwork include/linux/taskwork.h:38 [inline] doexit+0x618/0x1f64 kernel/exit.c:871 dogroupexit+0x194/0x22c kernel/exit.c:1020 getsignal+0x1500/0x15ec kernel/signal.c:2893 dosignal+0x23c/0x3b44 arch/arm64/kernel/signal.c:1249 donotifyresume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exittousermodeprepare arch/arm64/kernel/entry-common.c:169 [inline] exittousermode arch/arm64/kernel/entry-common.c:178 [inline] el0svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t64synchandler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t64sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Allocated by task 6166: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x40/0x78 mm/kasan/common.c:68 kasansaveallocinfo+0x70/0x84 mm/kasan/generic.c:626 unpoisonslab_object mm/kasan/common.c:314 [inline] __kasanslaballoc+0x74/0x8c mm/kasan/common.c:340 kasanslaballoc include/linux/kasan.h:201 [inline] slabpostallochook mm/slub.c:3813 [inline] slaballocnode mm/slub.c:3860 [inline] kmemcacheallocnode+0x204/0x4c0 mm/slub.c:3903 __allocskb+0x19c/0x3d8 net/core/skbuff.c:641 allocskb include/linux/skbuff.h:1296 [inline] kcm_sendmsg+0x1d3c/0x2124 net/kcm/kcmsock.c:783 socksendmsgnosec net/socket.c:730 [inline] __socksendmsg net/socket.c:745 [inline] socksendmsg+0x220/0x2c0 net/socket.c:768 splicetosocket+0x7cc/0xd58 fs/splice.c:889 dosplicefrom fs/splice.c:941 [inline] directspliceactor+0xec/0x1d8 fs/splice.c:1164 splicedirecttoactor+0x438/0xa0c fs/splice.c:1108 dosplicedirectactor ---truncated---
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44946.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/00425508f30baa5ab6449a1f478480ca7cffa6da
- https://git.kernel.org/stable/c/6633b17840bf828921254d788ccd15602843fe9b
- https://git.kernel.org/stable/c/72da240aafb142630cf16adc803ccdacb3780849
- https://git.kernel.org/stable/c/807067bf014d4a3ae2cc55bd3de16f22a01eb580
- https://git.kernel.org/stable/c/8c9cdbf600143bd6835c8b8351e5ac956da79aec
- https://git.kernel.org/stable/c/9c8d544ed619f704e2b70e63e08ab75630c2ea23
- https://git.kernel.org/stable/c/eb06c8d3022ce6738711191c89f9b3e9cfb91914
- https://git.kernel.org/stable/c/fa6c23fe6dcac8c8bd63920ee8681292a2bd544e
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44946.json
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://nvd.nist.gov/vuln/detail/CVE-2024-44946
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
-
Introducedab7ac4eb9832e32a09f4e8042705484d2fb0aad3Fixed8c9cdbf600143bd6835c8b8351e5ac956da79aecFixed6633b17840bf828921254d788ccd15602843fe9bFixedeb06c8d3022ce6738711191c89f9b3e9cfb91914Fixedfa6c23fe6dcac8c8bd63920ee8681292a2bd544eFixed72da240aafb142630cf16adc803ccdacb3780849Fixed00425508f30baa5ab6449a1f478480ca7cffa6daFixed9c8d544ed619f704e2b70e63e08ab75630c2ea23Fixed807067bf014d4a3ae2cc55bd3de16f22a01eb580
Affected versions
v4.*
v4.10
v4.10-rc1
v4.10-rc2
v4.10-rc3
v4.10-rc4
v4.10-rc5
v4.10-rc6
v4.10-rc7
v4.10-rc8
v4.11
v4.11-rc1
v4.11-rc2
v4.11-rc3
v4.11-rc4
v4.11-rc5
v4.11-rc6
v4.11-rc7
v4.11-rc8
v4.12
v4.12-rc1
v4.12-rc2
v4.12-rc3
v4.12-rc4
v4.12-rc5
v4.12-rc6
v4.12-rc7
v4.13
v4.13-rc1
v4.13-rc2
v4.13-rc3
v4.13-rc4
v4.13-rc5
v4.13-rc6
v4.13-rc7
v4.14
v4.14-rc1
v4.14-rc2
v4.14-rc3
v4.14-rc4
v4.14-rc5
v4.14-rc6
v4.14-rc7
v4.14-rc8
v4.15
v4.15-rc1
v4.15-rc2
v4.15-rc3
v4.15-rc4
v4.15-rc5
v4.15-rc6
v4.15-rc7
v4.15-rc8
v4.15-rc9
v4.16
v4.16-rc1
v4.16-rc2
v4.16-rc3
v4.16-rc4
v4.16-rc5
v4.16-rc6
v4.16-rc7
v4.17
v4.17-rc1
v4.17-rc2
v4.17-rc3
v4.17-rc4
v4.17-rc5
v4.17-rc6
v4.17-rc7
v4.18
v4.18-rc1
v4.18-rc2
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8
v4.19
v4.19-rc1
v4.19-rc2
v4.19-rc3
v4.19-rc4
v4.19-rc5
v4.19-rc6
v4.19-rc7
v4.19-rc8
v4.19.1
v4.19.10
v4.19.100
v4.19.101
v4.19.102
v4.19.103
v4.19.104
v4.19.105
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v4.19.46
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v4.19.5
v4.19.50
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v4.19.9
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v4.19.93
v4.19.94
v4.19.95
v4.19.96
v4.19.97
v4.19.98
v4.19.99
v4.20
v4.20-rc1
v4.20-rc2
v4.20-rc3
v4.20-rc4
v4.20-rc5
v4.20-rc6
v4.20-rc7
v4.5
v4.6
v4.6-rc1
v4.6-rc2
v4.6-rc3
v4.6-rc4
v4.6-rc5
v4.6-rc6
v4.6-rc7
v4.7
v4.7-rc1
v4.7-rc2
v4.7-rc3
v4.7-rc4
v4.7-rc5
v4.7-rc6
v4.7-rc7
v4.8
v4.8-rc1
v4.8-rc2
v4.8-rc3
v4.8-rc4
v4.8-rc5
v4.8-rc6
v4.8-rc7
v4.8-rc8
v4.9
v4.9-rc1
v4.9-rc2
v4.9-rc3
v4.9-rc4
v4.9-rc5
v4.9-rc6
v4.9-rc7
v4.9-rc8
v5.*
v5.0
v5.0-rc1
v5.0-rc2
v5.0-rc3
v5.0-rc4
v5.0-rc5
v5.0-rc6
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.10.1
v5.10.10
v5.10.100
v5.10.101
v5.10.102
v5.10.103
v5.10.104
v5.10.105
v5.10.106
v5.10.107
v5.10.108
v5.10.109
v5.10.11
v5.10.110
v5.10.111
v5.10.112
v5.10.113
v5.10.114
v5.10.115
v5.10.116
v5.10.117
v5.10.118
v5.10.119
v5.10.12
v5.10.120
v5.10.121
v5.10.122
v5.10.123
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v5.10.126
v5.10.127
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v5.10.13
v5.10.130
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v5.10.132
v5.10.133
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v5.10.3
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v5.10.93
v5.10.94
v5.10.95
v5.10.96
v5.10.97
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v5.11
v5.11-rc1
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v5.11-rc4
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v5.11-rc6
v5.11-rc7
v5.12
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v5.12-rc1-dontuse
v5.12-rc2
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v5.14-rc7
v5.15
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v5.15.1
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v5.15.100
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v5.4.6
v5.4.60
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v5.4.62
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v5.4.65
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v5.4.67
v5.4.68
v5.4.69
v5.4.7
v5.4.70
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v5.4.74
v5.4.75
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v5.4.8
v5.4.80
v5.4.81
v5.4.82
v5.4.83
v5.4.84
v5.4.85
v5.4.86
v5.4.87
v5.4.88
v5.4.89
v5.4.9
v5.4.90
v5.4.91
v5.4.92
v5.4.93
v5.4.94
v5.4.95
v5.4.96
v5.4.97
v5.4.98
v5.4.99
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
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v5.5-rc7
v5.6
v5.6-rc1
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v5.7
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v5.8
v5.8-rc1
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v5.8-rc3
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v5.9
v5.9-rc1
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v5.9-rc3
v5.9-rc4
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v5.9-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
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v6.1
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v6.1.1
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v6.1.105
v6.1.106
v6.1.11
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v6.1.3
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v6.1.82
v6.1.83
v6.1.84
v6.1.85
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v6.1.9
v6.1.90
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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
v6.10.1
v6.10.2
v6.10.3
v6.10.4
v6.10.5
v6.10.6
v6.11-rc1
v6.11-rc2
v6.11-rc3
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
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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
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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
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v6.6.15
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v6.8
v6.8-rc1
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v6.8-rc3
v6.8-rc4
v6.8-rc5
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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
[
{
"signature_type": "Line",
"signature_version": "v1",
"target": {
"file": "net/kcm/kcmsock.c"
},
"id": "CVE-2024-44946-45dd23ab",
"deprecated": false,
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb06c8d3022ce6738711191c89f9b3e9cfb91914",
"digest": {
"line_hashes": [
"11222879825583777654819104971549137494",
"106327939785617867306721108841257346993",
"284757159779874836168109585849536115147",
"160629565876852559165140737573216744692",
"275453973066797244176114157574241811405",
"115591006983475777144965430415105640008",
"285550621341100384355062218866480735911",
"221926593727910609542664651576592062305",
"169404790921476427312433544364269153165",
"153152251012629700848822099063850983697",
"305315302929001439164774467508614749937",
"278194909125728509742880600471785638722",
"207928684563953390188692522233785147960",
"40039806726305860030525714835052097899",
"153167102290880982869680243608492130536"
],
"threshold": 0.9
}
},
{
"signature_type": "Function",
"target": {
"file": "net/kcm/kcmsock.c",
"function": "kcm_sendmsg"
},
"deprecated": false,
"id": "CVE-2024-44946-4803453e",
"signature_version": "v1",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb06c8d3022ce6738711191c89f9b3e9cfb91914",
"digest": {
"function_hash": "149605789296799662460118598216888604604",
"length": 3250.0
}
},
{
"signature_type": "Line",
"digest": {
"line_hashes": [
"63355326201136482131820855593008767507",
"94668931504903969749820722961060751378",
"144891144950447011803528719298690612141",
"216761422932795247539600837940271124079"
],
"threshold": 0.9
},
"signature_version": "v1",
"id": "CVE-2024-44946-58de9234",
"deprecated": false,
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb06c8d3022ce6738711191c89f9b3e9cfb91914",
"target": {
"file": "include/net/kcm.h"
}
},
{
"signature_type": "Function",
"deprecated": false,
"digest": {
"function_hash": "207298889204058882104185487839263516453",
"length": 638.0
},
"id": "CVE-2024-44946-933d17f2",
"signature_version": "v1",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb06c8d3022ce6738711191c89f9b3e9cfb91914",
"target": {
"file": "net/kcm/kcmsock.c",
"function": "init_kcm_sock"
}
}
]
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44946.json"