CVE-2024-53108

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Adjust VSDB parser for replay feature

At some point, the IEEE ID identification for the replay check in the AMD EDID was added. However, this check causes the following out-of-bounds issues when using KASAN:

[ 27.804016] BUG: KASAN: slab-out-of-bounds in amdgpu_dm_update_freesync_caps+0xefa/0x17a0 [amdgpu] [ 27.804788] Read of size 1 at addr ffff8881647fdb00 by task systemd-udevd/383

...

[ 27.821207] Memory state around the buggy address: [ 27.821215] ffff8881647fda00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 27.821224] ffff8881647fda80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 27.821234] >ffff8881647fdb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.821243] ^ [ 27.821250] ffff8881647fdb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.821259] ffff8881647fdc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 27.821268] ==================================================================

This is caused because the ID extraction happens outside of the range of the edid lenght. This commit addresses this issue by considering the amd_vsdb_block size.

(cherry picked from commit b7e381b1ccd5e778e3d9c44c669ad38439a861d8)

This vulnerability is rated as Important severity because an out-of-bounds slab read in kernel memory can be triggered locally to induce a denial of service (system crash) or expose sensitive kernel data. The flaw specifically requires an AMD graphics device to parse crafted Extended Display Identification Data (EDID) containing custom vendor-specific data blocks. Red Hat Enterprise Linux releases are not affected, as the vulnerable display replay code was introduced only in newer upstream kernels and is absent from enterprise distributions.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.