What’s Vulnerable › Vulnerabilities

CVE-2026-53189: mm/huge_memory: update file PMD counter before folio_put()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-10-19
• Weakness: CWE-416

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().

Affected products

• Linux kernel: from 4.19 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.94, 6.18.36, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.94. Check the vendor advisory for mitigations.

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
• 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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