CVE-2021-47439

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47439
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47439.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47439
Related
Published
2024-05-22T07:15:09Z
Modified
2024-09-18T03:17:27.883474Z
Summary
[none]
Details

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

net: dsa: microchip: Added the condition for scheduling kszmibread_work

When the ksz module is installed and removed using rmmod, kernel crashes with null pointer dereferrence error. During rmmod, kszswitchremove function tries to cancel the mibreadworkqueue using canceldelayedwork_sync routine and unregister switch from dsa.

During dsaunregisterswitch it calls kszmaclinkdown, which in turn reschedules the workqueue since mibinterval is non-zero. Due to which queue executed after mibinterval and it tries to access dp->slave. But the slave is unregistered in the kszswitch_remove function. Hence kernel crashes.

To avoid this crash, before canceling the workqueue, resetted the mib_interval to 0.

v1 -> v2: -Removed the if condition in kszmibread_work

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
5.14.16-1

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
5.14.16-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}