Answer in brief
CVE-2023-54095 records a High severity (CVSS 7.0) vulnerability in powerpc/iommu: Fix notifiers being shared by PCI and VIO buses. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <dc0d107e624ca96aef6dd8722eb33ba3a6d157b0 || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <075a4dcdbc9a5ea793cb8ec8b78a6c0b7636fd52 || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <65bf8a196ba25cf65a858b5bb8de80f0aad76691 || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <f08944e3c6962b00827de7263a9e20688e79ad84 || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <a9ddbfed53465bc7c411231db32a488066c0c1be || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <f17d5efaafba3d5f02f0373f7c5f44711d676f3e || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <c46af58588253e5e4063bb5ddc78cd12fdf9e55d || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <6670c65bf863cd0d44ca24d4c10ef6755b8d9529 || >=d6b9a81b2a45786384f5bd3516bd6ddfb4b772c6 <c37b6908f7b2bd24dcaaf14a180e28c9132b9c58 | dc0d107e624ca96aef6dd8722eb33ba3a6d157b0, 075a4dcdbc9a5ea793cb8ec8b78a6c0b7636fd52, 65bf8a196ba25cf65a858b5bb8de80f0aad76691, f08944e3c6962b00827de7263a9e20688e79ad84, a9ddbfed53465bc7c411231db32a488066c0c1be, f17d5efaafba3d5f02f0373f7c5f44711d676f3e, c46af58588253e5e4063bb5ddc78cd12fdf9e55d, 6670c65bf863cd0d44ca24d4c10ef6755b8d9529, c37b6908f7b2bd24dcaaf14a180e28c9132b9c58 |
| Linux/Linuxgeneric | 3.6 | Not reported |
Published upstream
Dec 24, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: powerpc/iommu: Fix notifiers being shared by PCI and VIO buses fail_iommu_setup() registers the fail_iommu_bus_notifier struct to both PCI and VIO buses. struct notifier_block is a linked list node, so this causes any notifiers later registered to either bus type to also be registered to the other since they share the same node. This causes issues in (at least) the vgaarb code, which registers a notifier for PCI buses. pci_notify() ends up being called on a vio device, converted with to_pci_dev() even though it's not a PCI device, and finally makes a bad access in vga_arbiter_add_pci_device() as discovered with KASAN: BUG: KASAN: slab-out-of-bounds in vga_arbiter_add_pci_device+0x60/0xe00 Read of size 4 at addr c000000264c26fdc by task swapper/0/1 Call Trace: dump_stack_lvl+0x1bc/0x2b8 (unreliable) print_report+0x3f4/0xc60 kasan_report+0x244/0x698 __asan_load4+0xe8/0x250 vga_arbiter_add_pci_device+0x60/0xe00 pci_notify+0x88/0x444 notifier_call_chain+0x104/0x320 blocking_notifier_call_chain+0xa0/0x140 device_add+0xac8/0x1d30 device_register+0x58/0x80 vio_register_device_node+0x9ac/0xce0 vio_bus_scan_register_devices+0xc4/0x13c __machine_initcall_pseries_vio_device_init+0x94/0xf0 do_one_initcall+0x12c/0xaa8 kernel_init_freeable+0xa48/0xba8 kernel_init+0x64/0x400 ret_from_kernel_thread+0x5c/0x64 Fix this by creating separate notifier_block structs for each bus type. [mpe: Add #ifdef to fix CONFIG_IBMVIO=n build]
Quoted source text, attributed separately from HOL analysis.