PT-2025-53172 · Linux · Linux Kernel
Published
2023-08-25
·
Updated
2026-03-24
·
CVE-2023-54095
CVSS v2.0
4.6
Medium
| Vector | AV:L/AC:L/Au:S/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw in the powerpc/iommu subsystem related to the sharing of notifiers between PCI and VIO buses. The
fail iommu setup() function registers the fail iommu bus notifier struct to both PCI and VIO buses, causing notifiers registered to one bus type to also be registered to the other due to the use of a linked list node. This can lead to issues, such as incorrect function calls and memory access errors, specifically observed in the vgaarb code where pci notify() is called on a VIO device. This results in a bad access within the vga arbiter add pci device() function. The issue is fixed by creating separate notifier block structs for each bus type.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Out of bounds Read
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel