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:-:*:*:*:*:*:*:* |
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"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",
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\"4.4.* \"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"4.9.276 \", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.9.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \" 4.14.240\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.14.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"4.19.198\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.19.* \"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.4.133 \", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.4.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.10.51\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.10.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.12.18\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.12.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \" 5.13.3\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.13.*\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.14\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-28T18:27:26.837Z\"}}], \"cna\": {\"title\": \"mISDN: fix possible use-after-free in HFC_cleanup()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"54ff3202928952a100c477248e65ac6db01258a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"7867ddc5f3de7f289aee63233afc0df4b62834c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"5f2818185da0fe82a932f0856633038b66faf124\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"3ecd228c636ee17c14662729737fa07242a93cb0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"61370ff07e0acc657559a8fac02551dfeb9d3020\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"87c5fa1bb42624254a2013cbbc3b170d6017f5d6\", \"lessThan\": \"009fc857c5f6fda81f2f7dd851b2d54193a8e733\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/isdn/hardware/mISDN/hfcpci.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.29\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.29\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.276\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.276\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.240\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.133\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.51\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/isdn/hardware/mISDN/hfcpci.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.276\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.276\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.240\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.198\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.133\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.51\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.18\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.3\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"2.6.29\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:53:07.476Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47356\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:53:07.476Z\", \"dateReserved\": \"2024-05-21T14:28:16.987Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:59.097Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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