CVE-2026-52966

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

drm: Replace old pointer to new idr

Commit 5e28b7b94408 introduced a logical error by failing to replace the newly generated IDR pointer to old id's pointer at the correct location within the "change handle" logic; this resulted in the issue reported by syzbot [1].

Specifically, the new IDR object pointer is intended to replace the original id's pointer during the normal execution flow.

Additionally, an unnecessary conditional check for the ret exit path has been removed.

[1] !RBEMPTYROOT(&primefpriv->dmabufs) WARNING: drivers/gpu/drm/drmprime.c:224 at drmprimedestroyfileprivate+0x48/0x60 drivers/gpu/drm/drmprime.c:224, CPU#0: syz.0.17/5833 Call Trace: drmfilefree.part.0+0x7e6/0xcc0 drivers/gpu/drm/drmfile.c:269 drmfilefree drivers/gpu/drm/drmfile.c:237 [inline] drmclosehelper.isra.0+0x186/0x200 drivers/gpu/drm/drmfile.c:290 drmrelease+0x1ab/0x360 drivers/gpu/drm/drmfile.c:438