CVE-2021-47439
- Source
- https://cve.org/CVERecord?id=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
- Downstream
- Related
- Published
- 2024-05-22T07:15:09.163Z
- Modified
- 2026-03-14T14:51:53.977559Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 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
Git /
Database specific
unresolved_ranges
[
{
"events": [
{
"introduced": "5.7"
},
{
"fixed": "5.10.75"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.14.14"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc1"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc2"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc3"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc5"
}
]
}
]
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47439.json"