CVE-2021-47356 (GCVE-0-2021-47356)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:53
VLAI
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 (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
Impacted products
20 products
| Vendor | Product | Version | |
|---|---|---|---|
| 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) |
|
| 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) |
|
| 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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\"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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