CVE-2022-49896

cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak When a cxl_nvdimm object goes through a ->remove() event (device physically removed, nvdimm-bridge disabled, or nvdimm device disabled), then any associated regions must also be disabled. As highlighted by the cxl-create-region.sh test [1], a single device may host multiple regions, but the driver was only tracking one region at a time. This leads to a situation where only the last enabled region per nvdimm device is cleaned up properly. Other regions are leaked, and this also causes cxl_memdev reference leaks. Fix the tracking by allowing cxl_nvdimm objects to track multiple region associations.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.01%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/f43b6bfdbab78606735ba81185cf0602b81e40b6	patch
https://git.kernel.org/stable/c/4d07ae22e79ebc2d7528bbc69daa53b86981cb3a	patch

Frequently Asked Questions

What is the severity of CVE-2022-49896?: CVE-2022-49896 has been scored as a medium severity vulnerability.
How to fix CVE-2022-49896?: To fix CVE-2022-49896, 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-2022-49896 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49896 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-2022-49896?: CVE-2022-49896 affects Linux Linux, Linux Linux.

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