CVE-2025-21860

CVE-2025-21860

Título es
CVE-2025-21860

Mié, 12/03/2025 – 10:15

Gravedad 2.0 Txt
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Título en

CVE-2025-21860

Descripción en
In the Linux kernel, the following vulnerability has been resolved:

mm/zswap: fix inconsistency when zswap_store_page() fails

Commit b7c0ccdfbafd ("mm: zswap: support large folios in zswap_store()")
skips charging any zswap entries when it failed to zswap the entire folio.

However, when some base pages are zswapped but it failed to zswap the
entire folio, the zswap operation is rolled back. When freeing zswap
entries for those pages, zswap_entry_free() uncharges the zswap entries
that were not previously charged, causing zswap charging to become
inconsistent.

This inconsistency triggers two warnings with following steps:
# On a machine with 64GiB of RAM and 36GiB of zswap
$ stress-ng –bigheap 2 # wait until the OOM-killer kills stress-ng
$ sudo reboot

The two warnings are:
in mm/memcontrol.c:163, function obj_cgroup_release():
WARN_ON_ONCE(nr_bytes & (PAGE_SIZE – 1));

in mm/page_counter.c:60, function page_counter_cancel():
if (WARN_ONCE(new

12/03/2025

12/03/2025

Gravedad 3.1 Txt Gravedad 3.1 (CVSS 3.1 Base Score)
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