CVE-2023-52455

iommu: Don't reserve 0-length IOVA region

Description

In the Linux kernel, the following vulnerability has been resolved: iommu: Don't reserve 0-length IOVA region When the bootloader/firmware doesn't setup the framebuffers, their address and size are 0 in "iommu-addresses" property. If IOVA region is reserved with 0 length, then it ends up corrupting the IOVA rbtree with an entry which has pfn_hi < pfn_lo. If we intend to use display driver in kernel without framebuffer then it's causing the display IOMMU mappings to fail as entire valid IOVA space is reserved when address and length are passed as 0. An ideal solution would be firmware removing the "iommu-addresses" property and corresponding "memory-region" if display is not present. But the kernel should be able to handle this by checking for size of IOVA region and skipping the IOVA reservation if size is 0. Also, add a warning if firmware is requesting 0-length IOVA region reservation.

7.8

CVSS

Severity: High

CVSS 3.1 •

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/98b8a550da83cc392a14298c4b3eaaf0332ae6ad	patch
https://git.kernel.org/stable/c/5e23e283910c9f30248732ae0770bcb0c9438abf	patch
https://git.kernel.org/stable/c/bb57f6705960bebeb832142ce9abf43220c3eab1	patch

Frequently Asked Questions

What is the severity of CVE-2023-52455?: CVE-2023-52455 has been scored as a high severity vulnerability.
How to fix CVE-2023-52455?: To fix CVE-2023-52455, 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-2023-52455 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-52455 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-2023-52455?: CVE-2023-52455 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.