CVE-2026-80729 mm/huge_memory: initialise workingset state before folio split
A missing initialization in the Linux kernel memory management subsystem can cause a kernel warning and potential denial of service during memory reclaim.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80729?
CVE-2026-80729 is a vulnerability in Linux, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mm/huge_memory: initialise workingset state before folio split
xas_try_split() adds __GFP_ACCOUNT for page-cache xa_nodes, but __folio_split() leaves the xa_state's xa_lru unset. That lets a live, memcg-charged xa_node exist without being linked into the mapping's shadow_nodes list_lru; when reclaim later walks the list_lru it trips VM_WARN_ON(!css_is_dying()).
Use mapping_set_update() to install both the workingset update callback and the shadow_nodes list_lru on the xa_state.
Which versions are affected by CVE-2026-80729?
How do I fix CVE-2026-80729?
Apply the vendor's patch.
Is CVE-2026-80729 being exploited?
There is no known exploitation of CVE-2026-80729 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80729, DEBIAN-CVE-2026-80729, GHSA-p2p8-6fmx-rfj9, UBUNTU-CVE-2026-80729.