CVE-2026-53189

Description

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().

References

• https://git.kernel.org/stable/c/108963978a681c0c468d279cac2b930c27672877
• https://git.kernel.org/stable/c/459771c9cf30f378bdbd30fc65d17f7eb931bb59
• https://git.kernel.org/stable/c/5f5b604e1e6bde4e889199168ee80fe8306d06ad
• https://git.kernel.org/stable/c/6c29a8ba084e89499ca77b947e07ae817f9c16ce
• https://git.kernel.org/stable/c/84b3212b166b446faea27ebebb7161405ffceef9