CVE-2023-52455: linux kernel — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.3.0 — 6.6.14
linux	linux_kernel	6.7.0 — 6.7.2

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2023-52455? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-52455? +

CVE-2023-52455 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-52455? +

CVE-2023-52455 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-52455? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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