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.

A flaw was found in the Linux kernel's Data Access MONitor (DAMON) component. When `damon_pa_migrate()` or `damos_va_migrate()` functions attempt to migrate memory pages (folios) to an invalid Node ID (NID), these pages are not properly returned to the Least Recently Used (LRU) list. This improper handling results in the pages remaining isolated with an extra reference, which can lead to memory pinning and potential system instability or denial of service due to memory exhaustion.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-74644 https://nvd.nist.gov/vuln/detail/CVE-2026-74644 https://lore.kernel.org/linux-cve-announce/2026082224-CVE-2026-74644-d0a1@gregkh/T