AZL-86160
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-86160.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-86160
- Upstream
- Published
- 2026-05-08T14:16:37Z
- Modified
- 2026-08-31T05:26:27Z
- Summary
- CVE-2026-43303 affecting package kernel for versions less than 6.6.143.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mm/pagealloc: clear page->private in freepages_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, swapcountcontinued() 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:__dosysswapoff+0x1151/0x1860
Fix this by clearing page->private in freepagesprepare(), ensuring all freed pages have clean state regardless of previous use.
- References