FKIE_CVE-2021-47237
Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: hamradio: fix memory leak in mkiss_close
My local syzbot instance hit memory leak in
mkiss_open()[1]. The problem was in missing
free_netdev() in mkiss_close().
In mkiss_open() netdevice is allocated and then
registered, but in mkiss_close() netdevice was
only unregistered, but not freed.
Fail log:
BUG: memory leak
unreferenced object 0xffff8880281ba000 (size 4096):
comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s)
hex dump (first 32 bytes):
61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0.............
00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .'.*............
backtrace:
[<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
[<ffffffff8706e7e8>] alloc_netdev_mqs+0x98/0xe80
[<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
[<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
[<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
[<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
[<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
[<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
[<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
BUG: memory leak
unreferenced object 0xffff8880141a9a00 (size 96):
comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s)
hex dump (first 32 bytes):
e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(....
98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@..........
backtrace:
[<ffffffff8709f68b>] __hw_addr_create_ex+0x5b/0x310
[<ffffffff8709fb38>] __hw_addr_add_ex+0x1f8/0x2b0
[<ffffffff870a0c7b>] dev_addr_init+0x10b/0x1f0
[<ffffffff8706e88b>] alloc_netdev_mqs+0x13b/0xe80
[<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
[<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
[<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
[<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
[<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
[<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
[<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
BUG: memory leak
unreferenced object 0xffff8880219bfc00 (size 512):
comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s)
hex dump (first 32 bytes):
00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff ...(............
80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
[<ffffffff8706eec7>] alloc_netdev_mqs+0x777/0xe80
[<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
[<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
[<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
[<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
[<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
[<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
[<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
BUG: memory leak
unreferenced object 0xffff888029b2b200 (size 256):
comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
[<ffffffff8706f062>] alloc_netdev_mqs+0x912/0xe80
[<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
[<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
[<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
[<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
[<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
[<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
[<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/hamradio/mkiss.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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},
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/hamradio/mkiss.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.14"
},
{
"lessThan": "2.6.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.274",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.274",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.238",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.196",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hamradio: fix memory leak in mkiss_close\n\nMy local syzbot instance hit memory leak in\nmkiss_open()[1]. The problem was in missing\nfree_netdev() in mkiss_close().\n\nIn mkiss_open() netdevice is allocated and then\nregistered, but in mkiss_close() netdevice was\nonly unregistered, but not freed.\n\nFail log:\n\nBUG: memory leak\nunreferenced object 0xffff8880281ba000 (size 4096):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0.............\n 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .\u0027.*............\n backtrace:\n [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n [\u003cffffffff8706e7e8\u003e] alloc_netdev_mqs+0x98/0xe80\n [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880141a9a00 (size 96):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(....\n 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@..........\n backtrace:\n [\u003cffffffff8709f68b\u003e] __hw_addr_create_ex+0x5b/0x310\n [\u003cffffffff8709fb38\u003e] __hw_addr_add_ex+0x1f8/0x2b0\n [\u003cffffffff870a0c7b\u003e] dev_addr_init+0x10b/0x1f0\n [\u003cffffffff8706e88b\u003e] alloc_netdev_mqs+0x13b/0xe80\n [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880219bfc00 (size 512):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff ...(............\n 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................\n backtrace:\n [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n [\u003cffffffff8706eec7\u003e] alloc_netdev_mqs+0x777/0xe80\n [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff888029b2b200 (size 256):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n [\u003cffffffff8706f062\u003e] alloc_netdev_mqs+0x912/0xe80\n [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: hamradio: corrige la p\u00e9rdida de memoria en mkiss_close. Mi instancia local de syzbot tuvo una p\u00e9rdida de memoria en mkiss_open()[1]. El problema estaba en que faltaba free_netdev() en mkiss_close(). En mkiss_open() el dispositivo de red se asigna y luego se registra, pero en mkiss_close() el dispositivo de red solo se anula del registro, pero no se libera. Registro de errores: ERROR: p\u00e9rdida de memoria, objeto sin referencia 0xffff8880281ba000 (tama\u00f1o 4096): comunicaci\u00f3n \"syz-executor.1\", pid 11443, santiam\u00e9n 4295046091 (edad 17,660 s) volcado hexadecimal (primeros 32 bytes): 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0............. 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .\u0027.*....... .... seguimiento: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x98/0xe80 [] mkiss_open+0xb2/0x6f0 [] tty_ldisc_open+0x9b/0x110 [ ] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR : p\u00e9rdida de memoria objeto sin referencia 0xffff8880141a9a00 (tama\u00f1o 96): comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (edad 17.660s) volcado hexadecimal (primeros 32 bytes): e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(.... 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@....... .. seguimiento: [] __hw_addr_create_ex+0x5b/0x310 [] __hw_addr_add_ex+0x1f8/0x2b0 [] f0 [] alloc_netdev_mqs+0x13b/0xe80 [] mkiss_open +0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff8880219bfc00 (tama\u00f1o 512): comm \"syz-executor.1\", pid 11443, jiffies 95046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primeros 32 bytes): 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ...(............ 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x777/0xe80 [] mkiss_open+0xb2 /0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff888029b2b200 (tama\u00f1o 256): comm \"syz-executor.1\", pid 11443, jiffies 046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primero 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x912/0xe80 [] mkiss_open+0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+ 0x3a/0xb0 [] entrada_SYSCALL_64_after_hwframe+0x44/0xae"
}
],
"id": "CVE-2021-47237",
"lastModified": "2026-06-17T04:16:58.720",
"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-2021-47237",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:40:03.924521Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:12.930",
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-401"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.