Improper access control in Linux kernel - CVE-2026-52908
Published: June 23, 2026
Vulnerability identifier: #VU135028
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52908
CWE-ID: CWE-284
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 gain write access to memory regions that were not properly pinned as writable.
The vulnerability exists due to improper access control in RDMA memory region re-registration handling when changing IB_MR_REREG_ACCESS from read-only to read-write. A local user can re-register a memory region with writable access to gain write access to memory regions that were not properly pinned as writable.
The issue occurs when a driver reuses an existing umem during memory region re-registration.
How to mitigate CVE-2026-52908
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/09dc18894148381d3bfc550083b1236043870dce
- https://git.kernel.org/stable/c/2904e985a2917b5dac65df82733065e78a65fc9d
- https://git.kernel.org/stable/c/50334a05a950840b39a1ce3d2a173b4183db9b3e
- https://git.kernel.org/stable/c/badad6fad60def1b9805559dd81dbab3d97b82aa
- https://git.kernel.org/stable/c/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c