### [CVE-2024-56608](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56608)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=4.15%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=blue)

### Description

In the Linux kernel, the following vulnerability has been resolved:drm/amd/display: Fix out-of-bounds access in 'dcn21_link_encoder_create'An issue was identified in the dcn21_link_encoder_create function wherean out-of-bounds access could occur when the hpd_source index was usedto reference the link_enc_hpd_regs array. This array has a fixed sizeand the index was not being checked against the array's bounds beforeaccessing it.This fix adds a conditional check to ensure that the hpd_source index iswithin the valid range of the link_enc_hpd_regs array. If the index isout of bounds, the function now returns NULL to prevent undefinedbehavior.References:[   65.920507] ------------[ cut here ]------------[   65.920510] UBSAN: array-index-out-of-bounds in drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn21/dcn21_resource.c:1312:29[   65.920519] index 7 is out of range for type 'dcn10_link_enc_hpd_registers [5]'[   65.920523] CPU: 3 PID: 1178 Comm: modprobe Tainted: G           OE      6.8.0-cleanershaderfeatureresetasdntipmi200nv2132 #13[   65.920525] Hardware name: AMD Majolica-RN/Majolica-RN, BIOS WMJ0429N_Weekly_20_04_2 04/29/2020[   65.920527] Call Trace:[   65.920529]  <TASK>[   65.920532]  dump_stack_lvl+0x48/0x70[   65.920541]  dump_stack+0x10/0x20[   65.920543]  __ubsan_handle_out_of_bounds+0xa2/0xe0[   65.920549]  dcn21_link_encoder_create+0xd9/0x140 [amdgpu][   65.921009]  link_create+0x6d3/0xed0 [amdgpu][   65.921355]  create_links+0x18a/0x4e0 [amdgpu][   65.921679]  dc_create+0x360/0x720 [amdgpu][   65.921999]  ? dmi_matches+0xa0/0x220[   65.922004]  amdgpu_dm_init+0x2b6/0x2c90 [amdgpu][   65.922342]  ? console_unlock+0x77/0x120[   65.922348]  ? dev_printk_emit+0x86/0xb0[   65.922354]  dm_hw_init+0x15/0x40 [amdgpu][   65.922686]  amdgpu_device_init+0x26a8/0x33a0 [amdgpu][   65.922921]  amdgpu_driver_load_kms+0x1b/0xa0 [amdgpu][   65.923087]  amdgpu_pci_probe+0x1b7/0x630 [amdgpu][   65.923087]  local_pci_probe+0x4b/0xb0[   65.923087]  pci_device_probe+0xc8/0x280[   65.923087]  really_probe+0x187/0x300[   65.923087]  __driver_probe_device+0x85/0x130[   65.923087]  driver_probe_device+0x24/0x110[   65.923087]  __driver_attach+0xac/0x1d0[   65.923087]  ? __pfx___driver_attach+0x10/0x10[   65.923087]  bus_for_each_dev+0x7d/0xd0[   65.923087]  driver_attach+0x1e/0x30[   65.923087]  bus_add_driver+0xf2/0x200[   65.923087]  driver_register+0x64/0x130[   65.923087]  ? __pfx_amdgpu_init+0x10/0x10 [amdgpu][   65.923087]  __pci_register_driver+0x61/0x70[   65.923087]  amdgpu_init+0x7d/0xff0 [amdgpu][   65.923087]  do_one_initcall+0x49/0x310[   65.923087]  ? kmalloc_trace+0x136/0x360[   65.923087]  do_init_module+0x6a/0x270[   65.923087]  load_module+0x1fce/0x23a0[   65.923087]  init_module_from_file+0x9c/0xe0[   65.923087]  ? init_module_from_file+0x9c/0xe0[   65.923087]  idempotent_init_module+0x179/0x230[   65.923087]  __x64_sys_finit_module+0x5d/0xa0[   65.923087]  do_syscall_64+0x76/0x120[   65.923087]  entry_SYSCALL_64_after_hwframe+0x6e/0x76[   65.923087] RIP: 0033:0x7f2d80f1e88d[   65.923087] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48[   65.923087] RSP: 002b:00007ffc7bc1aa78 EFLAGS: 00000246 ORIG_RAX: 0000000000000139[   65.923087] RAX: ffffffffffffffda RBX: 0000564c9c1db130 RCX: 00007f2d80f1e88d[   65.923087] RDX: 0000000000000000 RSI: 0000564c9c1e5480 RDI: 000000000000000f[   65.923087] RBP: 0000000000040000 R08: 0000000000000000 R09: 0000000000000002[   65.923087] R10: 000000000000000f R11: 0000000000000246 R12: 0000564c9c1e5480[   65.923087] R13: 0000564c9c1db260 R14: 0000000000000000 R15: 0000564c9c1e54b0[   65.923087]  </TASK>[   65.923927] ---[ end trace ]---

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cve-scores
- https://github.com/bygregonline/devsec-fastapi-report
- https://github.com/cku-heise/euvd-api-doc
- https://github.com/w4zu/Debian_security