What’s Vulnerable › Vulnerabilities

CVE-2025-22000: mm/huge_memory: drop beyond-EOF folios with the right number of refs

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2025-04-03 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: drop beyond-EOF folios with the right number of refs When an after-split folio is large and needs to be dropped due to EOF, folio_put_refs(folio, folio_nr_pages(folio)) should be used to drop all page cache refs. Otherwise, the folio will not be freed, causing memory leak. This leak would happen on a filesystem with blocksize > page_size and a truncate is performed, where the blocksize makes folios split to >0 order ones, causing truncated folios not being freed.

Affected products

• Linux kernel: from 6.9 before 6.12.21; from 6.13 before 6.13.9; 6.14-rc1, 6.14-rc2, 6.14-rc3, 6.14-rc4, 6.14-rc5, 6.14-rc6 (+1) — fixed in 6.12.21, 6.13.9

How to fix

Upgrade to a fixed version: Linux kernel 6.12.21, 6.13.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14efb4793519d73fb2902bb0ece319b886e4b4b9
• https://git.kernel.org/stable/c/86368616a9ce51f6b41efa251b6e066893851d67
• https://git.kernel.org/stable/c/92ad820a1f2d95d5a8d6c2bd3f391bbb068a5f9e

Get alerted when CVE-2025-22000 or the next vulnerability affects your stack