Memory corruption in Linux kernel - CVE-2026-90120

Vulnerability identifier: #VU151359

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90120

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause out-of-bounds memory corruption.

The vulnerability exists due to improper validation of the get_logical_index() return value in gic_acpi_parse_iaffid() when parsing MADT GICC entries. A local user can trigger parsing of a MADT GICC entry that does not correspond to a logical CPU recognized by the kernel to cause out-of-bounds memory corruption.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/328affc639ce9873a7a0a3fd6b8339f19767529b
• https://git.kernel.org/stable/c/6caeb878f809bdf0aec2fdd96f3d41ef4b69fc69

• Memory corruption in Linux kernel irqchip driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more