Bug 2516315 (CVE-2026-72090)

Summary: CVE-2026-72090 kernel: accel/amdxdna: Use caller client for debug BO sync
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's amdxdna graphics acceleration driver. A local user could exploit an incorrect client handling issue within the `amdxdna_drm_sync_bo_ioctl()` function. When performing a `SYNC_DIRECT_FROM_DEVICE` operation, the `amdxdna_hwctx_sync_debug_bo()` function is called with an incorrect client, leading to a mismatch in the handle namespace and hardware context ownership. This could potentially allow unauthorized access to debug buffer objects.
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Description OSIDB Bzimport 2026-08-15 06:06:05 UTC 
In the Linux kernel, the following vulnerability has been resolved:

accel/amdxdna: Use caller client for debug BO sync

amdxdna_drm_sync_bo_ioctl() looks up args->handle in the ioctl caller's
drm_file. For SYNC_DIRECT_FROM_DEVICE, it then calls
amdxdna_hwctx_sync_debug_bo(), but passes abo->client.

amdxdna_hwctx_sync_debug_bo() uses the passed client both as the handle
namespace for debug_bo_hdl and as the owner of the hardware context xarray.
Those must match the file that supplied args->handle. The BO's stored
client pointer is object state, not the ioctl context.

Pass filp->driver_priv instead, matching the original handle lookup.
Comment 1 Keith Grant 2026-08-17 20:53:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081522-CVE-2026-72090-0f1d@gregkh/T