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
References
Configurations
Configuration 1 (hide)
|
History
02 Apr 2025, 15:14
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148 - Patch | |
| References | () https://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378 - Patch | |
| References | () https://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* |
|
| CWE | CWE-476 | |
| First Time |
Linux linux Kernel
Linux |
Information
Published : 2024-05-22 07:15
Updated : 2025-04-02 15:14
NVD link : CVE-2021-47439
Mitre link : CVE-2021-47439
CVE.ORG link : CVE-2021-47439
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference