From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-52965: drm/ttm: Fix ttm_bo_swapout() infinite LRU walk on swapout failure
Date: Wed, 24 Jun 2026 17:29:49 +0100 [thread overview]
Message-ID: <2026062438-CVE-2026-52965-b15c@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
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.
The Linux kernel CVE team has assigned CVE-2026-52965 to this issue.
Affected and fixed versions
===========================
Issue introduced in 6.13 with commit fc5d96670eb2540d2572a14351e82ffe45d5ac11 and fixed in 7.0.10 with commit 0124a09e3e5f5f6080efe9663b27af27933f8382
Issue introduced in 6.13 with commit fc5d96670eb2540d2572a14351e82ffe45d5ac11 and fixed in 7.1 with commit b2ed01e7ad3de80333e9b962a44024b094bc0b2b
Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.
Unaffected versions might change over time as fixes are backported to
older supported kernel versions. The official CVE entry at
https://cve.org/CVERecord/?id=CVE-2026-52965
will be updated if fixes are backported, please check that for the most
up to date information about this issue.
Affected files
==============
The file(s) affected by this issue are:
drivers/gpu/drm/ttm/ttm_bo.c
drivers/gpu/drm/ttm/ttm_resource.c
include/drm/ttm/ttm_resource.h
Mitigation
==========
The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes. Individual
changes are never tested alone, but rather are part of a larger kernel
release. Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all. If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
https://git.kernel.org/stable/c/0124a09e3e5f5f6080efe9663b27af27933f8382
https://git.kernel.org/stable/c/b2ed01e7ad3de80333e9b962a44024b094bc0b2b
reply other threads:[~2026-06-24 16:32 UTC|newest]
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