CVE-2021-47439
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47439
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47439.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47439
- Downstream
- Related
- Published
- 2024-05-22T07:15:09Z
- Modified
- 2025-07-01T13:10:39.076197Z
- 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
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source