Use-after-free in Linux kernel - CVE-2026-53189
Published: June 26, 2026
Vulnerability identifier: #VU135594
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53189
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in __split_huge_pmd_locked() when splitting a huge PMD mapping. A local user can trigger the affected memory-management path to cause a denial of service.
The issue occurs because file/shmem RSS accounting may access freed folio state after the last folio reference is dropped.
How to mitigate CVE-2026-53189
Install security update from vendor's repository.
Sources
- 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