CVE-2026-89571 Linux Kernel - Out of Bounds Read & Denial of Service

Linux kernel contains a buffer overflow caused by improper bounds checking of fwctl command payload in cxl/features, letting attackers cause out-of-bounds memory read and kernel crash, exploit requires crafted fwctl command with manipulated op_size.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix.

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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