CVE-2026-99208

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

drm/xe/oa: Zero OA buffer at allocation

ttm bo type kernel BOs are not guaranteed to be zeroed on allocation and may contain data from previously freed pages. Since the OA buffer is mmap'able by userspace, this can expose stale kernel memory contents.

Streams opened with DRM XE OA PROPERTY OA DISABLED allocate the OA buffer without calling xe oa init oa buffer(). Zero the buffer at allocation to prevent information disclosure through mmap.

The existing zeroing in xe oa init oa buffer() remains necessary for zero report-id/timestamp detection on enable/re-enable.

(cherry picked from commit 126c4c5388f9311a390b9b254a835b0cf0f55331)