CVE-2021-47494 (GCVE-0-2021-47494)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2025-05-04 07:12
VLAI?
Title
cfg80211: fix management registrations locking
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d , < 4c22227e39c7a0b4dab55617ee8d34d171fab8d4 (git)
Affected: 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d , < 3c897f39b71fe68f90599f6a45b5f7bf5618420e (git)
Affected: 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d , < 09b1d5dc6ce1c9151777f6c4e128a59457704c97 (git)
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    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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  • 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.
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  • 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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