CVE-2026-89570 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by improper lifetime management of the CXL MCE notifier in cxl/mce, letting attackers trigger NULL dereferences and use-after-free in the MCE handler, exploit requires specific hardware with CXL regions having extended linear cache.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for the CXL MCE notifier lifetime issue.

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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