7.8

CVE-2021-47361

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

mcb: fix error handling in mcb_alloc_bus()

There are two bugs:
1) If ida_simple_get() fails then this code calls put_device(carrier)
   but we haven't yet called get_device(carrier) and probably that
   leads to a use after free.
2) After device_initialize() then we need to use put_device() to
   release the bus.  This will free the internal resources tied to the
   device and call mcb_free_bus() which will free the rest.
Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.7 < 4.9.285
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.249
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.209
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.150
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.70
Linux ≫ Linux Kernel Version >= 5.11 < 5.14.9
Linux ≫ Linux Kernel Version5.15 Updaterc1
Linux ≫ Linux Kernel Version5.15 Updaterc2
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.02% 0.022
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.