CVE-2026-98181drm/gud: fix out-of-bounds write in gud_plane_atomic_check()

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/gud: fix out-of-bounds write in gud_plane_atomic_check() The plane property loop uses req->properties[num_properties + i] as write index while simultaneously incrementing `num_properties` inside the loop. At iteration i, num_properties has also incremented by i, so the write is done at `initial_num_properties + 2*i`, skipping every other index and advancing by 2 per iteration. With just 2 connector and 32 plane properties the last write happens at index 64, one slot past the end of the 64-slot (indices 0–63) allocation. A USB device can trigger OOB by advertising the maximum number of properties. Fix by dropping the redundant `+ i`; num_properties is already the correct running index, as gud_connector_fill_properties() fills the preceding slots.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/ee04903fe6a098160d20dde4fc5af4cb42846735
• https://git.kernel.org/stable/c/4153a9e008f2512bd3cf90a319436865847369b9
• https://git.kernel.org/stable/c/5f5e565410b4987e9663f599f9ab0c350f8338d4
• https://git.kernel.org/stable/c/7e630edb22088df7aa0d55b02237a71e4c9a523d
• https://git.kernel.org/stable/c/2c92af27ad23e2fbc0367b11a9027d36d94ef4b3
• https://git.kernel.org/stable/c/ea57100955c1c2a525ba1a98c18d9a05b25aeedb
• https://git.kernel.org/stable/c/59ced288fcba9e91bd38e61a972ad782c4edb7d0