CVE-2021-47439

In the Linux kernel, the following vulnerability has been resolved: net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work When the ksz module is installed and removed using rmmod, kernel crashes with null pointer dereferrence error. During rmmod, ksz_switch_remove function tries to cancel the mib_read_workqueue using cancel_delayed_work_sync routine and unregister switch from dsa. During dsa_unregister_switch it calls ksz_mac_link_down, which in turn reschedules the workqueue since mib_interval is non-zero. Due to which queue executed after mib_interval and it tries to access dp->slave. But the slave is unregistered in the ksz_switch_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 ksz_mib_read_work

The following products are affected by CVE-2021-47439 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2021-47439.

URL	Resource
https://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148
https://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378
https://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3
https://lore.kernel.org/linux-cve-announce/2024052239-CVE-2021-47439-b411@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47439
https://www.cve.org/CVERecord?id=CVE-2021-47439