# CVE-2024-47683: drm/amd/display: Skip Recompute DSC Params if no Stream on Link

CVE-2024-47683 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-47683, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-47683
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-47683

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Skip Recompute DSC Params if no Stream on Link  [why] Encounter NULL pointer dereference uner mst + dsc setup.  BUG: kernel NULL pointer dereference, address: 0000000000000008     PGD 0 P4D 0     Oops: 0000 [#1] PREEMPT SMP NOPTI     CPU: 4 PID: 917 Comm: sway Not tainted 6.3.9-arch1-1 #1 124dc55df4f5272ccb409f39ef4872fc2b3376a2     Hardware name: LENOVO 20NKS01Y00/20NKS01Y00, BIOS R12ET61W(1.31 ) 07/28/2022     RIP: 0010:drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper]     Code: 01 00 00 48 8b 85 60 05 00 00 48 63 80 88 00 00 00 3b 43 28 0f 8d 2e 01 00 00 48 8b 53 30 48 8d 04 80 48 8d 04 c2 48 8b 40 18 <48> 8>     RSP: 0018:ffff960cc2df77d8 EFLAGS: 00010293     RAX: 0000000000000000 RBX: ffff8afb87e81280 RCX: 0000000000000224     RDX: ffff8afb9ee37c00 RSI: ffff8afb8da1a578 RDI: ffff8afb87e81280     RBP: ffff8afb83d67000 R08: 0000000000000001 R09: ffff8afb9652f850     R10: ffff960cc2df7908 R11: 0000000000000002 R12: 0000000000000000     R13: ffff8afb8d7688a0 R14: ffff8afb8da1a578 R15: 0000000000000224     FS:  00007f4dac35ce00(0000) GS:ffff8afe30b00000(0000) knlGS:0000000000000000     CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033     CR2: 0000000000000008 CR3: 000000010ddc6000 CR4: 00000000003506e0     Call Trace: <TASK>      ? __die+0x23/0x70      ? page_fault_oops+0x171/0x4e0      ? plist_add+0xbe/0x100      ? exc_page_fault+0x7c/0x180      ? asm_exc_page_fault+0x26/0x30      ? drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper 0e67723696438d8e02b741593dd50d80b44c2026]      ? drm_dp_atomic_find_time_slots+0x28/0x260 [drm_display_helper 0e67723696438d8e02b741593dd50d80b44c2026]      compute_mst_dsc_configs_for_link+0x2ff/0xa40 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]      ? fill_plane_buffer_attributes+0x419/0x510 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]      compute_mst_dsc_configs_for_state+0x1e1/0x250 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]      amdgpu_dm_atomic_check+0xecd/0x1190 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]      drm_atomic_check_only+0x5c5/0xa40      drm_mode_atomic_ioctl+0x76e/0xbc0  [how] dsc recompute should be skipped if no mode change detected on the new request. If detected, keep checking whether the stream is already on current state or not.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.106-1 | [DEBIAN-CVE-2024-47683](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47683.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.10.6-1 | [DEBIAN-CVE-2024-47683](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47683.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.10.6-1 | [DEBIAN-CVE-2024-47683](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47683.md) | Oct 21, 2024 |

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