github - ghsa-c6p9-mw2r-7mc4

ghsa-c6p9-mw2r-7mc4

Vulnerability from github

Published

2024-05-22 09:31

Modified

2024-05-22 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

cfg80211: fix management registrations locking

The management registrations locking was broken, the list was locked for each wdev, but cfg80211_mgmt_registrations_update() iterated it without holding all the correct spinlocks, causing list corruption.

Rather than trying to fix it with fine-grained locking, just move the lock to the wiphy/rdev (still need the list on each wdev), we already need to hold the wdev lock to change it, so there's no contention on the lock in any case. This trivially fixes the bug since we hold one wdev's lock already, and now will hold the lock that protects all lists.

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  "affected": [],
  "aliases": [
    "CVE-2021-47494"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-22T09:15:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncfg80211: fix management registrations locking\n\nThe management registrations locking was broken, the list was\nlocked for each wdev, but cfg80211_mgmt_registrations_update()\niterated it without holding all the correct spinlocks, causing\nlist corruption.\n\nRather than trying to fix it with fine-grained locking, just\nmove the lock to the wiphy/rdev (still need the list on each\nwdev), we already need to hold the wdev lock to change it, so\nthere\u0027s no contention on the lock in any case. This trivially\nfixes the bug since we hold one wdev\u0027s lock already, and now\nwill hold the lock that protects all lists.",
  "id": "GHSA-c6p9-mw2r-7mc4",
  "modified": "2024-05-22T09:31:46Z",
  "published": "2024-05-22T09:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47494"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97"
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4"
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  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47494

Vulnerability from cvelistv5

Published

2024-05-22 08:19

Modified

2024-11-04 12:07

Severity ?

Summary

cfg80211: fix management registrations locking

References

▼	URL	Tags
	https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4
	https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e
	https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97

Impacted products

▼	Vendor	Product
	Linux	Linux
	Linux	Linux

Show details on NVD website

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