Vulnerability-Lookup

GHSA-X5FC-MWCH-J73R

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-01-10 18:31

Details

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

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47349"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:21Z",
    "severity": "MODERATE"
  },
  "details": "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]",
  "id": "GHSA-x5fc-mwch-j73r",
  "modified": "2025-01-10T18:31:37Z",
  "published": "2024-05-21T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47349"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3041d39d3c14da97fa3476835aba043ba810cf0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52

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.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 15:38 UTC

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a3041d39d3c14da97…
https://git.kernel.org/stable/c/35af69c7c0490fdcc…
https://git.kernel.org/stable/c/1f9482aa8d412b4ba…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < a3041d39d3c14da97fa3476835aba043ba810cf0 (git) Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 35af69c7c0490fdccfc159c6a87e4d1dc070838a (git) Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e (git)
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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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.509Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/35af69c7c0490fdccfc159c6a87e4d1dc070838a"
          },
          {
            "tags": [
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            "url": "https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e"
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        "title": "CVE Program Container"
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47349",
                "options": [
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                  },
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:38:43.542695Z",
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    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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        {
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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]"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e"
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      "title": "mwifiex: bring down link before deleting interface",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47349",
    "datePublished": "2024-05-21T14:35:54.314Z",
    "dateReserved": "2024-05-21T14:28:16.983Z",
    "dateUpdated": "2026-05-11T13:52:58.952Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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