CVE-2026-89459 Linux kernel - Denial of Service

Linux kernel s390/percpu contains an assembler macro argument parsing issue caused by improper whitespace handling in MVIY_PERCPU() macro, letting the assembler fail to emit necessary instructions, potentially causing exception return path failures, exploit requires use of older binutils versions.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update binutils to version 2.39 or later, or apply the Linux kernel patch fixing MVIY_PERCPU() macro usage.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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