CVE-2026-98166

Что произошло

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: fix swapped-out resources never leaving their bulk_move range ttm_tt_swapout() returns the number of pages swapped out on success and a negative error code on failure; for a populated ttm it never returns zero. Commit b2ed01e7ad3d ("drm/ttm: Fix ttm_bo_swapout() infinite LRU walk on swapout failure") moved the bulk_move bookkeeping in ttm_bo_swapout_cb() under "if (!ret)", so the ttm_resource_del_bulk_move_unevictable() / ttm_resource_move_to_lru_tail() pair is now skipped on every successful swapout. The equivalent change for the shrinker in commit 1d59f36e95f7 ("drm/ttm: Fix ttm_bo_shrink() infinite LRU walk on backup failure") tests "lret > 0", which is what was intended here as well. Before b2ed01e7ad3d the resource was taken off the bulk_move before the swapout; since then a swapped-out resource stays inside its BO's bulk_move range (and on the manager LRU) although it is unevictable. When it is later freed or the BO leaves the bulk_move (ttm_resource_free(), ttm_bo_set_bulk_move() via amdgpu_vm_bo_del()), ttm_resource_del_bulk_move() skips it because of its !ttm_resource_unevictable() guard, so a range endpoint in pos->first / pos->last is left pointing at freed memory. The next ttm_lru_bulk_move_tail() or ttm_resource_add_bulk_move() on that cursor is a use-after-free, seen as the resv WARN in ttm_lru_bulk_move_add(), "list_del corruption" in ttm_resource_move_to_lru_tail() or a NULL dereference in ttm_resource_manager_next() -- minutes to hours after a hibernation, or at process exit / reboot following one. Samuel Ainsworth's analysis of drm/amd issue 5387 (see Link) identified the dangling cursor; the missing removal at swapout time is the reason it dangles. Testing the condition for success restores the removal. On an AMD Phoenix APU (ASUS UM3406GA, gfx1103) running suspend-then-hibernate on a 7.0.y stable kernel carrying the backport (Ubuntu 7.0.0-31) the bug crashed 5 of 18 hibernation cycles; a function profile of one hibernation showed 336 ttm_tt_swapout() calls and zero ttm_resource_del_bulk_move_unevictable() calls. With this change the removal happens for every swapped-out resource and 12 further cycles were clean.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "060f8f3020516d71bc4d6159d4d0beef85606a74",
  "lessThan": "b48ebe399b4e72baa323462580fdd83ebda561e1",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b2ed01e7ad3de80333e9b962a44024b094bc0b2b",
  "lessThan": "1169fe8c11ca45e3f91d59a73eb271d0ca8a7fb0",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b2ed01e7ad3de80333e9b962a44024b094bc0b2b",
  "lessThan": "3db7d7d583419f7b1f2e141e36418802dbb25cf8",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "0124a09e3e5f5f6080efe9663b27af27933f8382",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "6.18.57",
  "lessThan": "6.18.59",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "7.0.10",
  "lessThan": "7.1",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "7.1"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "7.1",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.18.59",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.8",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:18.965958+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.350639+00:00"
  },
  "scores": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.350639+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.350639+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:18.965958+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.350639+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены02.11.2026, 00:13
2. Данные обновлены31.10.2026, 12:00
3. Данные обновлены28.10.2026, 23:13
4. Данные обновлены28.10.2026, 18:07
5. Данные обновлены28.10.2026, 17:59
6. Опубликована28.10.2026, 15:15

Личная заметка и статус

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