Improper synchronization in Linux kernel - CVE-2026-98228

Vulnerability identifier: #VU153786

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98228

CWE-ID: CWE-662

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to insufficient memory ordering in the MIPS arch_cmpxchg() implementation when executing lld/scd loops. A local user can stress an anonymous pipe with concurrent read and write operations to cause a denial of service.

The issue occurs on I6500 CPU cores, where lld and scd instructions provide no ordering guarantees. The reported failure occurred on a Mobile EyeQ5 MP5 evaluation board.

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 kernel - update to 7.0 rc3
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/3f017c2ca8c31a1e135dd87be647096866d6b196
• https://git.kernel.org/stable/c/bbc448c541ed90d52f9ec22f17394304e3bf170e

• Improper synchronization in Linux kernel mips
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more