In the Linux kernel, the following vulnerability has been resolved:
LoongArch: Fix potential ADE in loongson_gpu_fixup_dma_hang()
The switch case in loongson_gpu_fixup_dma_hang() may not DC2 or DC3, and
readl(crtc_reg) will access with random address, because the "device" is
from "base+PCI_DEVICE_ID", "base" is from "pdev->devfn+1". This is wrong
when my platform inserts a discrete GPU:
lspci -tv
-[0000:00]-+-00.0 Loongson Technology LLC Hyper Transport Bridge Controller
...
+-06.0 Loongson Technology LLC LG100 GPU
+-06.2 Loongson Technology LLC Device 7a37
...
Add a default switch case to fix the panic as below:
Kernel ade access[#1]:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.136-loong64-desktop-hwe+ #4
pc 90000000017e5534 ra 90000000017e54c0 tp 90000001002f8000 sp 90000001002fb6c0
a0 80000efe00003100 a1 0000000000003100 a2 0000000000000000 a3 0000000000000002
a4 90000001002fb6b4 a5 900000087cdb58fd a6 90000000027af000 a7 0000000000000001
t0 00000000000085b9 t1 000000000000ffff t2 0000000000000000 t3 0000000000000000
t4 fffffffffffffffd t5 00000000fffb6d9c t6 0000000000083b00 t7 00000000000070c0
t8 900000087cdb4d94 u0 900000087cdb58fd s9 90000001002fb826 s0 90000000031c12c8
s1 7fffffffffffff00 s2 90000000031c12d0 s3 0000000000002710 s4 0000000000000000
s5 0000000000000000 s6 9000000100053000 s7 7fffffffffffff00 s8 90000000030d4000
ra: 90000000017e54c0 loongson_gpu_fixup_dma_hang+0x40/0x210
ERA: 90000000017e5534 loongson_gpu_fixup_dma_hang+0xb4/0x210
CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
PRMD: 00000004 (PPLV0 +PIE -PWE)
EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)
ESTAT: 00480000 [ADEM] (IS= ECode=8 EsubCode=1)
BADV: 7fffffffffffff00
PRID: 0014d000 (Loongson-64bit, Loongson-3A6000-HV)
Modules linked in:
Process swapper/0 (pid: 1, threadinfo=(____ptrval____), task=(____ptrval____))
Stack : 0000000000000006 90000001002fb778 90000001002fb704 0000000000000007
0000000016a65700 90000000017e5690 000000000000ffff ffffffffffffffff
900000000209f7c0 9000000100053000 900000000209f7a8 9000000000eebc08
0000000000000000 0000000000000000 0000000000000006 90000001002fb778
90000001000530b8 90000000027af000 0000000000000000 9000000100054000
9000000100053000 9000000000ebb70c 9000000100004c00 9000000004000001
90000001002fb7e4 bae765461f31cb12 0000000000000000 0000000000000000
0000000000000006 90000000027af000 0000000000000030 90000000027af000
900000087cd6f800 9000000100053000 0000000000000000 9000000000ebc560
7a2500147cdaf720 bae765461f31cb12 0000000000000001 0000000000000030
...
Call Trace:
[<90000000017e5534>] loongson_gpu_fixup_dma_hang+0xb4/0x210
[<9000000000eebc08>] pci_fixup_device+0x108/0x280
[<9000000000ebb70c>] pci_setup_device+0x24c/0x690
[<9000000000ebc560>] pci_scan_single_device+0xe0/0x140
[<9000000000ebc684>] pci_scan_slot+0xc4/0x280
[<9000000000ebdd00>] pci_scan_child_bus_extend+0x60/0x3f0
[<9000000000f5bc94>] acpi_pci_root_create+0x2b4/0x420
[<90000000017e5e74>] pci_acpi_scan_root+0x2d4/0x440
[<9000000000f5b02c>] acpi_pci_root_add+0x21c/0x3a0
[<9000000000f4ee54>] acpi_bus_attach+0x1a4/0x3c0
[<90000000010e200c>] device_for_each_child+0x6c/0xe0
[<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70
[<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0
[<90000000010e200c>] device_for_each_child+0x6c/0xe0
[<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70
[<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0
[<9000000000f5211c>] acpi_bus_scan+0x6c/0x280
[<900000000189c028>] acpi_scan_init+0x194/0x310
[<900000000189bc6c>] acpi_init+0xcc/0x140
[<9000000000220cdc>] do_one_initcall+0x4c/0x310
[<90000000018618fc>] kernel_init_freeable+0x258/0x2d4
[<900000000184326c>] kernel_init+0x28/0x13c
[<9000000000222008>] ret_from_kernel_thread+0xc/0xa4
LoongArch: Fix potential ADE in loongson_gpu_fixup_dma_hang()
The switch case in loongson_gpu_fixup_dma_hang() may not DC2 or DC3, and
readl(crtc_reg) will access with random address, because the "device" is
from "base+PCI_DEVICE_ID", "base" is from "pdev->devfn+1". This is wrong
when my platform inserts a discrete GPU:
lspci -tv
-[0000:00]-+-00.0 Loongson Technology LLC Hyper Transport Bridge Controller
...
+-06.0 Loongson Technology LLC LG100 GPU
+-06.2 Loongson Technology LLC Device 7a37
...
Add a default switch case to fix the panic as below:
Kernel ade access[#1]:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.136-loong64-desktop-hwe+ #4
pc 90000000017e5534 ra 90000000017e54c0 tp 90000001002f8000 sp 90000001002fb6c0
a0 80000efe00003100 a1 0000000000003100 a2 0000000000000000 a3 0000000000000002
a4 90000001002fb6b4 a5 900000087cdb58fd a6 90000000027af000 a7 0000000000000001
t0 00000000000085b9 t1 000000000000ffff t2 0000000000000000 t3 0000000000000000
t4 fffffffffffffffd t5 00000000fffb6d9c t6 0000000000083b00 t7 00000000000070c0
t8 900000087cdb4d94 u0 900000087cdb58fd s9 90000001002fb826 s0 90000000031c12c8
s1 7fffffffffffff00 s2 90000000031c12d0 s3 0000000000002710 s4 0000000000000000
s5 0000000000000000 s6 9000000100053000 s7 7fffffffffffff00 s8 90000000030d4000
ra: 90000000017e54c0 loongson_gpu_fixup_dma_hang+0x40/0x210
ERA: 90000000017e5534 loongson_gpu_fixup_dma_hang+0xb4/0x210
CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
PRMD: 00000004 (PPLV0 +PIE -PWE)
EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)
ESTAT: 00480000 [ADEM] (IS= ECode=8 EsubCode=1)
BADV: 7fffffffffffff00
PRID: 0014d000 (Loongson-64bit, Loongson-3A6000-HV)
Modules linked in:
Process swapper/0 (pid: 1, threadinfo=(____ptrval____), task=(____ptrval____))
Stack : 0000000000000006 90000001002fb778 90000001002fb704 0000000000000007
0000000016a65700 90000000017e5690 000000000000ffff ffffffffffffffff
900000000209f7c0 9000000100053000 900000000209f7a8 9000000000eebc08
0000000000000000 0000000000000000 0000000000000006 90000001002fb778
90000001000530b8 90000000027af000 0000000000000000 9000000100054000
9000000100053000 9000000000ebb70c 9000000100004c00 9000000004000001
90000001002fb7e4 bae765461f31cb12 0000000000000000 0000000000000000
0000000000000006 90000000027af000 0000000000000030 90000000027af000
900000087cd6f800 9000000100053000 0000000000000000 9000000000ebc560
7a2500147cdaf720 bae765461f31cb12 0000000000000001 0000000000000030
...
Call Trace:
[<90000000017e5534>] loongson_gpu_fixup_dma_hang+0xb4/0x210
[<9000000000eebc08>] pci_fixup_device+0x108/0x280
[<9000000000ebb70c>] pci_setup_device+0x24c/0x690
[<9000000000ebc560>] pci_scan_single_device+0xe0/0x140
[<9000000000ebc684>] pci_scan_slot+0xc4/0x280
[<9000000000ebdd00>] pci_scan_child_bus_extend+0x60/0x3f0
[<9000000000f5bc94>] acpi_pci_root_create+0x2b4/0x420
[<90000000017e5e74>] pci_acpi_scan_root+0x2d4/0x440
[<9000000000f5b02c>] acpi_pci_root_add+0x21c/0x3a0
[<9000000000f4ee54>] acpi_bus_attach+0x1a4/0x3c0
[<90000000010e200c>] device_for_each_child+0x6c/0xe0
[<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70
[<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0
[<90000000010e200c>] device_for_each_child+0x6c/0xe0
[<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70
[<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0
[<9000000000f5211c>] acpi_bus_scan+0x6c/0x280
[<900000000189c028>] acpi_scan_init+0x194/0x310
[<900000000189bc6c>] acpi_init+0xcc/0x140
[<9000000000220cdc>] do_one_initcall+0x4c/0x310
[<90000000018618fc>] kernel_init_freeable+0x258/0x2d4
[<900000000184326c>] kernel_init+0x28/0x13c
[<9000000000222008>] ret_from_kernel_thread+0xc/0xa4
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
|
|||||||||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
No data.
No data.
No data.
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 28 May 2026 10:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix potential ADE in loongson_gpu_fixup_dma_hang() The switch case in loongson_gpu_fixup_dma_hang() may not DC2 or DC3, and readl(crtc_reg) will access with random address, because the "device" is from "base+PCI_DEVICE_ID", "base" is from "pdev->devfn+1". This is wrong when my platform inserts a discrete GPU: lspci -tv -[0000:00]-+-00.0 Loongson Technology LLC Hyper Transport Bridge Controller ... +-06.0 Loongson Technology LLC LG100 GPU +-06.2 Loongson Technology LLC Device 7a37 ... Add a default switch case to fix the panic as below: Kernel ade access[#1]: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.136-loong64-desktop-hwe+ #4 pc 90000000017e5534 ra 90000000017e54c0 tp 90000001002f8000 sp 90000001002fb6c0 a0 80000efe00003100 a1 0000000000003100 a2 0000000000000000 a3 0000000000000002 a4 90000001002fb6b4 a5 900000087cdb58fd a6 90000000027af000 a7 0000000000000001 t0 00000000000085b9 t1 000000000000ffff t2 0000000000000000 t3 0000000000000000 t4 fffffffffffffffd t5 00000000fffb6d9c t6 0000000000083b00 t7 00000000000070c0 t8 900000087cdb4d94 u0 900000087cdb58fd s9 90000001002fb826 s0 90000000031c12c8 s1 7fffffffffffff00 s2 90000000031c12d0 s3 0000000000002710 s4 0000000000000000 s5 0000000000000000 s6 9000000100053000 s7 7fffffffffffff00 s8 90000000030d4000 ra: 90000000017e54c0 loongson_gpu_fixup_dma_hang+0x40/0x210 ERA: 90000000017e5534 loongson_gpu_fixup_dma_hang+0xb4/0x210 CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE) PRMD: 00000004 (PPLV0 +PIE -PWE) EUEN: 00000000 (-FPE -SXE -ASXE -BTE) ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7) ESTAT: 00480000 [ADEM] (IS= ECode=8 EsubCode=1) BADV: 7fffffffffffff00 PRID: 0014d000 (Loongson-64bit, Loongson-3A6000-HV) Modules linked in: Process swapper/0 (pid: 1, threadinfo=(____ptrval____), task=(____ptrval____)) Stack : 0000000000000006 90000001002fb778 90000001002fb704 0000000000000007 0000000016a65700 90000000017e5690 000000000000ffff ffffffffffffffff 900000000209f7c0 9000000100053000 900000000209f7a8 9000000000eebc08 0000000000000000 0000000000000000 0000000000000006 90000001002fb778 90000001000530b8 90000000027af000 0000000000000000 9000000100054000 9000000100053000 9000000000ebb70c 9000000100004c00 9000000004000001 90000001002fb7e4 bae765461f31cb12 0000000000000000 0000000000000000 0000000000000006 90000000027af000 0000000000000030 90000000027af000 900000087cd6f800 9000000100053000 0000000000000000 9000000000ebc560 7a2500147cdaf720 bae765461f31cb12 0000000000000001 0000000000000030 ... Call Trace: [<90000000017e5534>] loongson_gpu_fixup_dma_hang+0xb4/0x210 [<9000000000eebc08>] pci_fixup_device+0x108/0x280 [<9000000000ebb70c>] pci_setup_device+0x24c/0x690 [<9000000000ebc560>] pci_scan_single_device+0xe0/0x140 [<9000000000ebc684>] pci_scan_slot+0xc4/0x280 [<9000000000ebdd00>] pci_scan_child_bus_extend+0x60/0x3f0 [<9000000000f5bc94>] acpi_pci_root_create+0x2b4/0x420 [<90000000017e5e74>] pci_acpi_scan_root+0x2d4/0x440 [<9000000000f5b02c>] acpi_pci_root_add+0x21c/0x3a0 [<9000000000f4ee54>] acpi_bus_attach+0x1a4/0x3c0 [<90000000010e200c>] device_for_each_child+0x6c/0xe0 [<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70 [<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0 [<90000000010e200c>] device_for_each_child+0x6c/0xe0 [<9000000000f4bbf4>] acpi_dev_for_each_child+0x44/0x70 [<9000000000f4ef40>] acpi_bus_attach+0x290/0x3c0 [<9000000000f5211c>] acpi_bus_scan+0x6c/0x280 [<900000000189c028>] acpi_scan_init+0x194/0x310 [<900000000189bc6c>] acpi_init+0xcc/0x140 [<9000000000220cdc>] do_one_initcall+0x4c/0x310 [<90000000018618fc>] kernel_init_freeable+0x258/0x2d4 [<900000000184326c>] kernel_init+0x28/0x13c [<9000000000222008>] ret_from_kernel_thread+0xc/0xa4 | |
| Title | LoongArch: Fix potential ADE in loongson_gpu_fixup_dma_hang() | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
Sign in to view the affected projects.
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-05-28T09:36:12.075Z
Reserved: 2026-05-13T15:03:33.102Z
Link: CVE-2026-46156
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-05-28T10:16:31.233
Modified: 2026-05-28T10:16:31.233
Link: CVE-2026-46156
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.