CVE-2022-50232

arm64: set UXN on swapper page tables

Description

In the Linux kernel, the following vulnerability has been resolved: arm64: set UXN on swapper page tables [ This issue was fixed upstream by accident in c3cee924bd85 ("arm64: head: cover entire kernel image in initial ID map") as part of a large refactoring of the arm64 boot flow. This simple fix is therefore preferred for -stable backporting ] On a system that implements FEAT_EPAN, read/write access to the idmap is denied because UXN is not set on the swapper PTEs. As a result, idmap_kpti_install_ng_mappings panics the kernel when accessing __idmap_kpti_flag. Fix it by setting UXN on these PTEs.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a

Frequently Asked Questions

What is the severity of CVE-2022-50232?: CVE-2022-50232 has not yet been assigned a CVSS score.
How to fix CVE-2022-50232?: To fix CVE-2022-50232, 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-2022-50232 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-50232 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-2022-50232?: CVE-2022-50232 affects Linux Linux, Linux Linux.

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