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().

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

https://git.kernel.org/stable/c/8d878059924f12c1bc24556a92ec56add74de3c8

https://git.kernel.org/stable/c/ae9d4caf6f133e884cf5fcda4982c493b35e5194

https://git.kernel.org/stable/c/ed5b030931292c94133437ac5e5ff580e498eabd

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