CVE-2026-89904 Linux Kernel - Buffer Overflow

Linux kernel contains an array overflow caused by improper sizing of acpi_package_ids[] in LoongArch virt machine with PPTT ACPI table, letting attackers cause memory corruption, exploit requires specific hardware configuration.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the fix for acpi_package_ids[] array overflow.

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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