Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-93127

Vulnerability identifier: #VU150879

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-2026-93127

CWE-ID: CWE-681

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause an out-of-bounds access.

The vulnerability exists due to improper scalar identifier handling in the BPF verifier when processing sign-extending narrowing fills from spilled scalar stack slots. A local user can load a BPF program that combines sign-extending and zero-extending fills of the same stack slot to cause an out-of-bounds access.

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/2cb5f4ca695ebe552647e5ba4aad6934d6a43bae
• https://git.kernel.org/stable/c/f3614622dc41f3dd99bb4f691da253814e4e6cae

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