#VU124495 Type conversion in Linux kernel - CVE-2026-23352
Published: March 25, 2026
Vulnerability identifier: #VU124495
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23352
CWE-ID: CWE-704
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to improper memory management in the EFI boot services memory release mechanism when processing memory map initialization during system boot. A local attacker can trigger the early release of boot services memory before deferred memory map initialization is complete, leading to unfreed memory pages and a memory leak.
The issue specifically occurs on systems with CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, where memblock_free_late() skips uninitialized pages, resulting in a significant memory leak—up to approximately 140MB on constrained systems like EC2 t3a.nano instances with only 512MB RAM.
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/227688312fece0026fc67a00ba9a0b3611ebe95d
- https://git.kernel.org/stable/c/399da820ecfe6f4f10c143e5c453d3559a04db9c
- https://git.kernel.org/stable/c/4a2cb90c538f06c873a187aa743575d48685d7a6
- https://git.kernel.org/stable/c/6a25e25279282c5c8ade554c04c6ab9dc7902c64
- https://git.kernel.org/stable/c/7dcf59422a3b0d20ddda844f856b4a1e0608a326
- https://git.kernel.org/stable/c/a4b0bf6a40f3c107c67a24fbc614510ef5719980
- https://git.kernel.org/stable/c/f9e9cc320854a76a39e7bc92d144554f3a727fad