Bug 2492788 (CVE-2026-53189) - CVE-2026-53189 kernel: mm/huge_memory: update file PMD counter before folio_put()
Summary: CVE-2026-53189 kernel: mm/huge_memory: update file PMD counter before folio_p...
Keywords:
Status: NEW
Alias: CVE-2026-53189
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-25 10:05 UTC by OSIDB Bzimport
Modified: 2026-06-26 08:03 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-25 10:05:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/huge_memory: update file PMD counter before folio_put()

__split_huge_pmd_locked() updates the file/shmem RSS counter after
dropping the PMD mapping's folio reference.  If folio_put() drops the last
reference, mm_counter_file() can later read freed folio state via
folio_test_swapbacked().

Move the counter update before folio_put().
Comment 1 TEJ RATHI 2026-06-26 07:57:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062557-CVE-2026-53189-1b4a@gregkh/T
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