CVE-2026-52965

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

drm/ttm: Fix ttm_bo_swapout() infinite LRU walk on swapout failure

When ttm_tt_swapout() fails, the current code calls

ttm_resource_add_bulk_move() followed by ttm_resource_move_to_lru_tail()

to restore the resource's bulk_move membership.

However, ttm_resource_move_to_lru_tail() places the resource at the tail

of the LRU list which, relative to the walk cursor's hitch node (placed

immediately after the resource when it was yielded), puts the resource

*in front of the* the hitch. The next list_for_each_entry_continue() from

the hitch finds the same resource again, causing an infinite loop.

Fix by deferring del_bulk_move to the success path only.

On the success path, TTM_TT_FLAG_SWAPPED has just been set by

ttm_tt_swapout() but the resource is still tracked in the bulk_move range,

so ttm_resource_del_bulk_move()'s !ttm_resource_unevictable() guard would

incorrectly skip the removal. Introduce

ttm_resource_del_bulk_move_unevictable() which bypasses that guard.