CVE-2026-74644 mm/damon/ops-common: putback folios on invalid migrate nid
A Linux kernel bug in DAMON migration causes folios to remain isolated, leading to memory leaks and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74644?
CVE-2026-74644 is a memory corruption vulnerability in Linux, published on 22 Aug 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/ops-common: putback folios on invalid migrate nid
damon_pa_migrate() and damos_va_migrate() isolate folios into a local list and then call damon_migrate_pages(). When target_nid is invalid (including the scheme default NUMA_NO_NODE / -1), damon_migrate_pages() returns early without putting the folios back to the LRU.
Callers then discard the list head while those folios remain isolated with an extra reference taken by folio_isolate_lru(). The pages stay off the LRU for as long as the mapping exists (anon active+inactive counts drop while RSS does not), and the leftover references can pin the pages after the mapping is gone.
Put the folios back on the invalid-nid path so ignored migration requests still return them to the LRU.
Which versions are affected by CVE-2026-74644?
How do I fix CVE-2026-74644?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74644 being exploited?
There is no known exploitation of CVE-2026-74644 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74644, DEBIAN-CVE-2026-74644, GHSA-m6xx-fpfc-5x79, UBUNTU-CVE-2026-74644.