CVE-2026-89755
CVE CVE-2026-89755EUVD EUVD-2026-76667Published 2026-09-11T19:46:58.000ZLast changed 2026-09-13T06:34:01.000ZCVSS 7.8
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: clear stale mapping after freeing swapcache __migrate_device_pages() reads the folio mapping before calling folio_free_swap(). When folio_free_swap() succeeds, the folio is removed from the swap cache, but the saved mapping still points to swap_space. Passing the stale mapping to folio_migrate_mapping() makes it use the mapped-folio path for a folio that is no longer in swapcache. It can then operate on swap_space.i_pages with invalid reference accounting, eventually triggering a folio reference count BUG. After a successful split, nr still contains the number of pages in the original large folio, although each resulting page is now a separate order-0 folio. Reset nr to 1 so each split folio is processed separately, including its own swapcache removal and mapping lookup. Refresh the saved mapping after folio_free_swap() so the current folio state is used during migration.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux df263d9a7dffee94ca5391120ee3b0587efa07f1 <34a00895d032a414830d41106a09329ae6c251b6; 6.6; patch: 7.2.4; patch: 0; patch: 7.3-rc1; df263d9a7dffee94ca5391120ee3b0587efa07f1 <8ffedc6573a665cdc31ebe47eae7b32b78d0df83
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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