CVE-2026-53189
HIGH 7.8In 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().
ELEVATED IMPACT
Severe if exploited (CVSS 7.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 4th percentile
○ In CISA KEV
○ Public exploit / PoC
Impact if exploited
7.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Weakness (CWE)
Not classified.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Technical & other
- https://git.kernel.org/stable/c/84b3212b166b446faea27ebebb7161405ffceef9
- https://git.kernel.org/stable/c/108963978a681c0c468d279cac2b930c27672877
- https://git.kernel.org/stable/c/459771c9cf30f378bdbd30fc65d17f7eb931bb59
- https://git.kernel.org/stable/c/ae9d4caf6f133e884cf5fcda4982c493b35e5194
- https://git.kernel.org/stable/c/6c29a8ba084e89499ca77b947e07ae817f9c16ce
- https://git.kernel.org/stable/c/5f5b604e1e6bde4e889199168ee80fe8306d06ad
- https://git.kernel.org/stable/c/ed5b030931292c94133437ac5e5ff580e498eabd
- https://git.kernel.org/stable/c/8d878059924f12c1bc24556a92ec56add74de3c8