CVE-2022-49989

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

Description

In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmd_ioctl_dm_op() The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference. Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode. Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef
https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54

Frequently Asked Questions

What is the severity of CVE-2022-49989?: CVE-2022-49989 has not yet been assigned a CVSS score.
How to fix CVE-2022-49989?: To fix CVE-2022-49989, 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-2022-49989 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49989 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-2022-49989?: CVE-2022-49989 affects Linux Linux, Linux Linux.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.