CVE-2021-47528

usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init()

Description

In the Linux kernel, the following vulnerability has been resolved: usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init() In cdnsp_endpoint_init(), cdnsp_ring_alloc() is assigned to pep->ring and there is a dereference of it in cdnsp_endpoint_init(), which could lead to a NULL pointer dereference on failure of cdnsp_ring_alloc(). Fix this bug by adding a check of pep->ring. This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_USB_CDNSP_GADGET=y show no new warnings, and our static analyzer no longer warns about this code.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.05%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/7d94bc8e335cb33918e52efdbe192c36707bfa24 patch
https://git.kernel.org/stable/c/37307f7020ab38dde0892a578249bf63d00bca64 patch

Frequently Asked Questions

What is the severity of CVE-2021-47528?
CVE-2021-47528 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47528?
To fix CVE-2021-47528, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47528 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47528 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47528?
CVE-2021-47528 affects Linux Linux, Linux Linux.
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