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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-debuginfo-common-x86_64Upgrade perf6.12Upgrade kernel6.12-headersUpgrade kernel6.12-debuginfoUpgrade kernel6.12-develUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-tools-develUpgrade python3-perf6.12Upgrade kernel-livepatch-6.12.111-136.204Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12Upgrade bpftool6.12-debuginfoUpgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade perf6.12-debuginfo | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 11, 2026 |
| Redhat_linux | — | No solution exists | Sep 23, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 11, 2026 |
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