CVE-2021-47349 (GCVE-0-2021-47349)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI?
Title
mwifiex: bring down link before deleting interface
Summary
In the Linux kernel, the following vulnerability has been resolved: mwifiex: bring down link before deleting interface We can deadlock when rmmod'ing the driver or going through firmware reset, because the cfg80211_unregister_wdev() has to bring down the link for us, ... which then grab the same wiphy lock. nl80211_del_interface() already handles a very similar case, with a nice description: /* * We hold RTNL, so this is safe, without RTNL opencount cannot * reach 0, and thus the rdev cannot be deleted. * * We need to do it for the dev_close(), since that will call * the netdev notifiers, and we need to acquire the mutex there * but don't know if we get there from here or from some other * place (e.g. "ip link set ... down"). */ mutex_unlock(&rdev->wiphy.mtx); ... Do similarly for mwifiex teardown, by ensuring we bring the link down first. Sample deadlock trace: [ 247.103516] INFO: task rmmod:2119 blocked for more than 123 seconds. [ 247.110630] Not tainted 5.12.4 #5 [ 247.115796] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 247.124557] task:rmmod state:D stack: 0 pid: 2119 ppid: 2114 flags:0x00400208 [ 247.133905] Call trace: [ 247.136644] __switch_to+0x130/0x170 [ 247.140643] __schedule+0x714/0xa0c [ 247.144548] schedule_preempt_disabled+0x88/0xf4 [ 247.149714] __mutex_lock_common+0x43c/0x750 [ 247.154496] mutex_lock_nested+0x5c/0x68 [ 247.158884] cfg80211_netdev_notifier_call+0x280/0x4e0 [cfg80211] [ 247.165769] raw_notifier_call_chain+0x4c/0x78 [ 247.170742] call_netdevice_notifiers_info+0x68/0xa4 [ 247.176305] __dev_close_many+0x7c/0x138 [ 247.180693] dev_close_many+0x7c/0x10c [ 247.184893] unregister_netdevice_many+0xfc/0x654 [ 247.190158] unregister_netdevice_queue+0xb4/0xe0 [ 247.195424] _cfg80211_unregister_wdev+0xa4/0x204 [cfg80211] [ 247.201816] cfg80211_unregister_wdev+0x20/0x2c [cfg80211] [ 247.208016] mwifiex_del_virtual_intf+0xc8/0x188 [mwifiex] [ 247.214174] mwifiex_uninit_sw+0x158/0x1b0 [mwifiex] [ 247.219747] mwifiex_remove_card+0x38/0xa0 [mwifiex] [ 247.225316] mwifiex_pcie_remove+0xd0/0xe0 [mwifiex_pcie] [ 247.231451] pci_device_remove+0x50/0xe0 [ 247.235849] device_release_driver_internal+0x110/0x1b0 [ 247.241701] driver_detach+0x5c/0x9c [ 247.245704] bus_remove_driver+0x84/0xb8 [ 247.250095] driver_unregister+0x3c/0x60 [ 247.254486] pci_unregister_driver+0x2c/0x90 [ 247.259267] cleanup_module+0x18/0xcdc [mwifiex_pcie]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < a3041d39d3c14da97fa3476835aba043ba810cf0 (git)
Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 35af69c7c0490fdccfc159c6a87e4d1dc070838a (git)
Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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Podemos bloquearnos al modificar el controlador o restablecer el firmware, porque cfg80211_unregister_wdev() tiene que desactivar el enlace por nosotros. .. que luego agarra el mismo candado wiphy. nl80211_del_interface() ya maneja un caso muy similar, con una buena descripci\u00f3n: /* * Mantenemos RTNL, por lo que esto es seguro, sin RTNL opencount no puede * llegar a 0 y, por lo tanto, rdev no se puede eliminar. * * Necesitamos hacerlo para dev_close(), ya que eso llamar\u00e1 * a los notificadores de netdev, y necesitamos adquirir el mutex all\u00ed * pero no sabemos si llegamos all\u00ed desde aqu\u00ed o desde alg\u00fan otro * lugar (por ejemplo \\\"enlace IP configurado... inactivo\\\"). */ mutex_unlock(\u0026amp;rdev-\u0026gt;wiphy.mtx); ... Haga lo mismo con el desmontaje de mwifiex, asegur\u00e1ndose de que primero desconectamos el enlace. Ejemplo de seguimiento de interbloqueo: [247.103516] INFORMACI\u00d3N: tarea rmmod:2119 bloqueada durante m\u00e1s de 123 segundos. [247.110630] No contaminado 5.12.4 #5 [247.115796] \\\"echo 0 \u0026gt; /proc/sys/kernel/hung_task_timeout_secs\\\" desactiva este mensaje. [247.124557] tarea:rmmod estado:D pila: 0 pid: 2119 ppid: 2114 banderas:0x00400208 [247.133905] Rastreo de llamadas: [247.136644] __switch_to+0x130/0x170 [ 247.140643] 14/0xa0c [247.144548] Schedule_preempt_disabled+0x88/ 0xf4 [ 247.149714] __mutex_lock_common+0x43c/0x750 [ 247.154496] mutex_lock_nested+0x5c/0x68 [ 247.158884] cfg80211_netdev_notifier_call+0x280/0x4e0 [cfg80211] [ 47.165769] raw_notifier_call_chain+0x4c/0x78 [ 247.170742] call_netdevice_notifiers_info+0x68/0xa4 [ 247.176305] __dev_close_many+0x7c /0x138 [ 247.180693] dev_close_many+0x7c/0x10c [ 247.184893] unregister_netdevice_many+0xfc/0x654 [ 247.190158] unregister_netdevice_queue+0xb4/0xe0 [ 247.195424] 11_unregister_wdev+0xa4/0x204 [cfg80211] [ 247.201816] cfg80211_unregister_wdev+0x20/0x2c [cfg80211] [ 247.208016 ] mwifiex_del_virtual_intf+0xc8/0x188 [mwifiex] [ 247.214174] mwifiex_uninit_sw+0x158/0x1b0 [mwifiex] [ 247.219747] mwifiex_remove_card+0x38/0xa0 [mwifiex] [ 247.225316 ] mwifiex_pcie_remove+0xd0/0xe0 [mwifiex_pcie] [ 247.231451] pci_device_remove+0x50/0xe0 [ 247.235849] device_release_driver_internal+0x110/0x1b0 [ 247.241701] driver_detach+0x5c/0x9c [ 247.245704] bus_remove_driver+0x84/0xb8 [ 247.250095] driver_unregister+0x3c/0x60 [ 2 47.254486] pci_unregister_driver+0x2c/0x90 [ 247.259267] cleanup_module+0x18/0xcdc [mwifiex_pcie ]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.18\",\"matchCriteriaId\":\"5EB72DFA-B894-49EE-B7E0-64BEA02A6669\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.13\",\"versionEndExcluding\":\"5.13.3\",\"matchCriteriaId\":\"853187F6-707A-487B-95C0-621B5211B43C\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a3041d39d3c14da97fa3476835aba043ba810cf0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a3041d39d3c14da97fa3476835aba043ba810cf0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a3041d39d3c14da97fa3476835aba043ba810cf0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.509Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47349\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:38:43.542695Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:13.781Z\"}}], \"cna\": {\"title\": \"mwifiex: bring down link before deleting interface\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a05829a7222e\", \"lessThan\": \"a3041d39d3c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a05829a7222e\", \"lessThan\": \"35af69c7c049\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a05829a7222e\", \"lessThan\": \"1f9482aa8d41\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireless/marvell/mwifiex/main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"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/net/wireless/marvell/mwifiex/main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a3041d39d3c14da97fa3476835aba043ba810cf0\"}, {\"url\": \"https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a\"}, {\"url\": \"https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmwifiex: bring down link before deleting interface\\n\\nWe can deadlock when rmmod\u0027ing the driver or going through firmware\\nreset, because the cfg80211_unregister_wdev() has to bring down the link\\nfor us, ... which then grab the same wiphy lock.\\n\\nnl80211_del_interface() already handles a very similar case, with a nice\\ndescription:\\n\\n        /*\\n         * We hold RTNL, so this is safe, without RTNL opencount cannot\\n         * reach 0, and thus the rdev cannot be deleted.\\n         *\\n         * We need to do it for the dev_close(), since that will call\\n         * the netdev notifiers, and we need to acquire the mutex there\\n         * but don\u0027t know if we get there from here or from some other\\n         * place (e.g. \\\"ip link set ... down\\\").\\n         */\\n        mutex_unlock(\u0026rdev-\u003ewiphy.mtx);\\n...\\n\\nDo similarly for mwifiex teardown, by ensuring we bring the link down\\nfirst.\\n\\nSample deadlock trace:\\n\\n[  247.103516] INFO: task rmmod:2119 blocked for more than 123 seconds.\\n[  247.110630]       Not tainted 5.12.4 #5\\n[  247.115796] \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n[  247.124557] task:rmmod           state:D stack:    0 pid: 2119 ppid:  2114 flags:0x00400208\\n[  247.133905] Call trace:\\n[  247.136644]  __switch_to+0x130/0x170\\n[  247.140643]  __schedule+0x714/0xa0c\\n[  247.144548]  schedule_preempt_disabled+0x88/0xf4\\n[  247.149714]  __mutex_lock_common+0x43c/0x750\\n[  247.154496]  mutex_lock_nested+0x5c/0x68\\n[  247.158884]  cfg80211_netdev_notifier_call+0x280/0x4e0 [cfg80211]\\n[  247.165769]  raw_notifier_call_chain+0x4c/0x78\\n[  247.170742]  call_netdevice_notifiers_info+0x68/0xa4\\n[  247.176305]  __dev_close_many+0x7c/0x138\\n[  247.180693]  dev_close_many+0x7c/0x10c\\n[  247.184893]  unregister_netdevice_many+0xfc/0x654\\n[  247.190158]  unregister_netdevice_queue+0xb4/0xe0\\n[  247.195424]  _cfg80211_unregister_wdev+0xa4/0x204 [cfg80211]\\n[  247.201816]  cfg80211_unregister_wdev+0x20/0x2c [cfg80211]\\n[  247.208016]  mwifiex_del_virtual_intf+0xc8/0x188 [mwifiex]\\n[  247.214174]  mwifiex_uninit_sw+0x158/0x1b0 [mwifiex]\\n[  247.219747]  mwifiex_remove_card+0x38/0xa0 [mwifiex]\\n[  247.225316]  mwifiex_pcie_remove+0xd0/0xe0 [mwifiex_pcie]\\n[  247.231451]  pci_device_remove+0x50/0xe0\\n[  247.235849]  device_release_driver_internal+0x110/0x1b0\\n[  247.241701]  driver_detach+0x5c/0x9c\\n[  247.245704]  bus_remove_driver+0x84/0xb8\\n[  247.250095]  driver_unregister+0x3c/0x60\\n[  247.254486]  pci_unregister_driver+0x2c/0x90\\n[  247.259267]  cleanup_module+0x18/0xcdc [mwifiex_pcie]\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:04:12.235Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47349\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:04:12.235Z\", \"dateReserved\": \"2024-05-21T14:28:16.983Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:54.314Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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

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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.



Detection rules are retrieved from Rulezet.