CVE-2026-74644: mm/damon/ops-common: putback folios on invalid migrate nid

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-22 · updated 2026-10-14

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.

Affected products

Linux kernel: from 6.12.44 before 6.12.105; from 6.16.4 before 6.17; 6.17 — fixed in 6.12.105, 6.17, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.105, 6.17, 7.2. Check the vendor advisory for mitigations.

References

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