Type Confusion in Linux kernel - CVE-2026-90312

Vulnerability identifier: #VU151179

CSH Severity: Low

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

CVE-ID: CVE-2026-90312

CWE-ID: CWE-843

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to access underlying kernel object data.

The vulnerability exists due to type confusion in the BPF verifier's check_atomic_load() function when verifying a load-acquire operation that fetches into its own source register. A local user can load a crafted BPF program to access underlying kernel object data.

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/422a416041172af1ac610736d5f556d22b31b115
• https://git.kernel.org/stable/c/6ee7b00888498cf387dd30729e18a05328b94709
• https://git.kernel.org/stable/c/b87803391baa7e0bef60549d8841f12e549ad057

• Type Confusion in Linux kernel bpf
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more