CVE-2021-47494

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Source

https://nvd.nist.gov/vuln/detail/CVE-2021-47494

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47494.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2021-47494

Related

Published

2024-05-22T09:15:11Z

Modified

2024-09-18T03:17:28.996346Z

Summary

[none]

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 cfg80211mgmtregistrations_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.

References

Affected packages

Debian:11 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.10.84-1

Affected versions

5.*

5.10.46-4

5.10.46-5

5.10.70-1~bpo10+1

5.10.70-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.15.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.15.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}