Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-90195

Vulnerability identifier: #VU151285

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90195

CWE-ID: CWE-681

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause incorrect handling of signed kfunc arguments.

The vulnerability exists due to incorrect numeric conversion in the RV64 BPF JIT compiler when processing signed 1-byte and 2-byte kfunc arguments. A local user can invoke a kfunc with signed 1-byte or 2-byte arguments to cause incorrect handling of signed kfunc arguments.

Linux kernel
Debian Linux
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)
linux (Debian 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
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5
• https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88
• https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324
• https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0

• Incorrect Conversion between Numeric Types in Linux kernel riscv net
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more