CVE-2026-89443 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability caused by lack of validation of user-provided level in perf mask ioctls in platform/x86 ISST component, letting attackers cause memory disclosure, exploit requires crafted ioctl input.

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
Information Disclosure
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 with the fix for ISST perf mask ioctl validation.

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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