CVE-2021-47356 (GCVE-0-2021-47356)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:53
VLAI
EPSS
VEX
Title
mISDN: fix possible use-after-free in HFC_cleanup()
Summary
In the Linux kernel, the following vulnerability has been resolved:
mISDN: fix possible use-after-free in HFC_cleanup()
This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.
Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-16 21:04 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
Impacted products
20 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe
(git)
Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 54ff3202928952a100c477248e65ac6db01258a7 (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 7867ddc5f3de7f289aee63233afc0df4b62834c5 (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 5f2818185da0fe82a932f0856633038b66faf124 (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 3ecd228c636ee17c14662729737fa07242a93cb0 (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 61370ff07e0acc657559a8fac02551dfeb9d3020 (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda (git) Affected: 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 , < 009fc857c5f6fda81f2f7dd851b2d54193a8e733 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.29
Unaffected: 0 , < 2.6.29 (semver) Unaffected: 4.4.276 , ≤ 4.4.* (semver) Unaffected: 4.9.276 , ≤ 4.9.* (semver) Unaffected: 4.14.240 , ≤ 4.14.* (semver) Unaffected: 4.19.198 , ≤ 4.19.* (semver) Unaffected: 5.4.133 , ≤ 5.4.* (semver) Unaffected: 5.10.51 , ≤ 5.10.* (semver) Unaffected: 5.12.18 , ≤ 5.12.* (semver) Unaffected: 5.13.3 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix) |
guessed | |
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 49331c07ef0f
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 54ff32029289
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 7867ddc5f3de
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 5f2818185da0
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 3ecd228c636e
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < b7ee9ae1e0cf
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 61370ff07e0a
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < ed7c3739d0a0
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4 , < 009fc857c5f6
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.4.276 , ≤ 4.4.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.9.276 , ≤ 4.9.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.14.240 , ≤ 4.14.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.19.198 , ≤ 4.19.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.4.133 , ≤ 5.4.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.10.51 , ≤ 5.10.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.12.18 , ≤ 5.12.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.13.3 , ≤ 5.13.*
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.14
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
{
"containers": {
"adp": [
{
"affected": [
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "49331c07ef0f",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "54ff32029289",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "7867ddc5f3de",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5f2818185da0",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "3ecd228c636e",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "b7ee9ae1e0cf",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "61370ff07e0a",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "ed7c3739d0a0",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "009fc857c5f6",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.276",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.240",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.198",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.3",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"status": "unaffected",
"version": "5.14"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-47356",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-01-16T21:04:48.759363Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-01-16T21:05:18.885Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:32:08.504Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "54ff3202928952a100c477248e65ac6db01258a7",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "7867ddc5f3de7f289aee63233afc0df4b62834c5",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "5f2818185da0fe82a932f0856633038b66faf124",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "3ecd228c636ee17c14662729737fa07242a93cb0",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "61370ff07e0acc657559a8fac02551dfeb9d3020",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "009fc857c5f6fda81f2f7dd851b2d54193a8e733",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"lessThan": "2.6.29",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.240",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.198",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.276",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.276",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.240",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.198",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.133",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.51",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.18",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13.3",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.14",
"versionStartIncluding": "2.6.29",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: fix possible use-after-free in HFC_cleanup()\n\nThis module\u0027s remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver\u0027s remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T13:53:07.476Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
},
{
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
}
],
"title": "mISDN: fix possible use-after-free in HFC_cleanup()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47356",
"datePublished": "2024-05-21T14:35:59.097Z",
"dateReserved": "2024-05-21T14:28:16.987Z",
"dateUpdated": "2026-05-11T13:53:07.476Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47356",
"date": "2026-09-18",
"epss": "0.00267",
"percentile": "0.19096"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "54ff3202928952a100c477248e65ac6db01258a7",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "7867ddc5f3de7f289aee63233afc0df4b62834c5",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "5f2818185da0fe82a932f0856633038b66faf124",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "3ecd228c636ee17c14662729737fa07242a93cb0",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "61370ff07e0acc657559a8fac02551dfeb9d3020",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "009fc857c5f6fda81f2f7dd851b2d54193a8e733",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"lessThan": "2.6.29",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.240",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.198",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"affectedData": [
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "49331c07ef0f",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "54ff32029289",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "7867ddc5f3de",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5f2818185da0",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "3ecd228c636e",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "b7ee9ae1e0cf",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "61370ff07e0a",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "ed7c3739d0a0",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "009fc857c5f6",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.276",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.240",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.198",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.3",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"status": "unaffected",
"version": "5.14"
}
]
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "10282F37-B17F-4974-967E-FCD5ABC9AB8E",
"versionEndExcluding": "4.4.276",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C79FFC06-9530-4CD7-B651-01D786CC925E",
"versionEndExcluding": "4.9.276",
"versionStartIncluding": "4.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "FB359B2E-773D-4D52-9915-E07A47ABE72B",
"versionEndExcluding": "4.14.240",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B93AEDB9-C52B-4222-8F9A-882DAD9EF5B2",
"versionEndExcluding": "4.19.198",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "65A8F1FF-5639-455A-8BF4-9FF529240505",
"versionEndExcluding": "5.4.133",
"versionStartIncluding": "4.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "93289127-DFB3-4515-89DD-50521FF8B7FF",
"versionEndExcluding": "5.10.51",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "79D13C82-E06F-4A70-A3D1-C09494FBC94D",
"versionEndExcluding": "5.12.18",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "853187F6-707A-487B-95C0-621B5211B43C",
"versionEndExcluding": "5.13.3",
"versionStartIncluding": "5.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: fix possible use-after-free in HFC_cleanup()\n\nThis module\u0027s remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver\u0027s remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mISDN: corrige posible use after free en HFC_cleanup(). La ruta de eliminaci\u00f3n de este m\u00f3dulo llama a del_timer(). Sin embargo, esa funci\u00f3n no espera hasta que finalice el controlador del temporizador. Esto significa que es posible que el controlador del temporizador a\u00fan est\u00e9 ejecut\u00e1ndose despu\u00e9s de que haya finalizado la funci\u00f3n de eliminaci\u00f3n del controlador, lo que dar\u00eda como resultado un use after free. Para solucionarlo, llame a del_timer_sync(), lo que garantiza que el controlador del temporizador haya finalizado y no pueda reprogramarse."
}
],
"id": "CVE-2021-47356",
"lastModified": "2026-06-17T04:17:16.827",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 5.2,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-47356",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-01-16T21:04:48.759363Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:21.920",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:49:58+00:00",
"cve": "CVE-2021-47356",
"id": "CVE-2021-47356",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:fixed": "413",
"product_status:known_affected": "42",
"product_status:known_not_affected": "119",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mISDN: fix possible use-after-free in HFC_cleanup()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47356.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:32:08.504Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
}
],
"title": "CVE Program Container"
},
{
"affected": [
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "49331c07ef0f ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": " 54ff32029289 ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "7867ddc5f3de ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5f2818185da0 ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "3ecd228c636e ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "b7ee9ae1e0cf ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "61370ff07e0a ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": " ed7c3739d0a0 ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "009fc857c5f6 ",
"status": "affected",
"version": "1da177e4c3f4",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.4.* ",
"status": "unaffected",
"version": "4.4.276 ",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276 ",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": " 4.14.240",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "4.19.* ",
"status": "unaffected",
"version": "4.19.198",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133 ",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": " 5.13.3",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"status": "unaffected",
"version": "5.14"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-47356",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-01-16T21:04:48.759363Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-05-28T18:27:26.837Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "54ff3202928952a100c477248e65ac6db01258a7",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "7867ddc5f3de7f289aee63233afc0df4b62834c5",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "5f2818185da0fe82a932f0856633038b66faf124",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "3ecd228c636ee17c14662729737fa07242a93cb0",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "61370ff07e0acc657559a8fac02551dfeb9d3020",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
},
{
"lessThan": "009fc857c5f6fda81f2f7dd851b2d54193a8e733",
"status": "affected",
"version": "87c5fa1bb42624254a2013cbbc3b170d6017f5d6",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcpci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"lessThan": "2.6.29",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.276",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.240",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.198",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.133",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.51",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.18",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.13.*",
"status": "unaffected",
"version": "5.13.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.276",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.276",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.240",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.198",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.133",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.51",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.18",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13.3",
"versionStartIncluding": "2.6.29",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.14",
"versionStartIncluding": "2.6.29",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: fix possible use-after-free in HFC_cleanup()\n\nThis module\u0027s remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver\u0027s remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T13:53:07.476Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"
},
{
"url": "https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"
},
{
"url": "https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"
},
{
"url": "https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"
},
{
"url": "https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"
},
{
"url": "https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"
},
{
"url": "https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"
},
{
"url": "https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"
},
{
"url": "https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"
}
],
"title": "mISDN: fix possible use-after-free in HFC_cleanup()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47356",
"datePublished": "2024-05-21T14:35:59.097Z",
"dateReserved": "2024-05-21T14:28:16.987Z",
"dateUpdated": "2026-05-11T13:53:07.476Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…