#VU124503 Memory corruption in Linux kernel - CVE-2026-23345
Published: March 25, 2026
Vulnerability identifier: #VU124503
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23345
CWE-ID: CWE-119
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 user to cause a denial of service, disclose sensitive information, and potentially execute arbitrary code.
The vulnerability exists due to improper memory access in the arm64 GCS page table entry (PTE) handling when FEAT_LPA2 is enabled. A local user can trigger a kernel paging request by invoking operations that involve GCS mappings, leading to a system crash and potential memory disclosure.
The issue arises because the PTE_SHARED bits are incorrectly set in GCS mappings when FEAT_LPA2 is active, causing invalid page table entries that result in a kernel oops during memory unmapping operations.
Remediation
Install security update from vendor's repository.