EUVD-2026-28573
GHSA-6fh9-96ww-pvwq
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: clear page->private in free_pages_prepare()
Several subsystems (slub, shmem, ttm, etc.) use page->private but don't clear it before freeing pages. When these pages are later allocated as high-order pages and split via split_page(), tail pages retain stale page->private values.
This causes a use-after-free in the swap subsystem. The swap code uses page->private to track swap count continuations, assuming freshly allocated pages have page->private == 0. When stale values are present, swap_count_continued() incorrectly assumes the continuation list is valid and iterates over uninitialized page->lru containing LIST_POISON values, causing a crash:
KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107] RIP: 0010:__do_sys_swapoff+0x1151/0x1860
Fix this by clearing page->private in free_pages_prepare(), ensuring all freed pages have clean state regardless of previous use.
AnalysisAI
Use-after-free in Linux kernel swap subsystem allows local authenticated users to achieve high-severity code execution, integrity violations, or denial of service. The vulnerability stems from multiple kernel subsystems (SLUB, shmem, TTM) failing to clear page->private fields before freeing memory, causing stale pointers to persist when pages are reallocated and split. …
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RemediationAI
Within 24 hours: inventory systems running Linux kernel versions prior to 6.18.16, 6.19.6, or 7.0. Within 7 days: apply vendor-released patches to kernel 6.18.16, 6.19.6, or 7.0 or later depending on your supported branch. …
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