CVE-2026-89581 Linux Kernel - Privilege Escalation

Linux kernel contains a privilege escalation caused by incorrect per-CPU address resolution in BPF x86 extended registers, letting attackers cause kernel panic and memory corruption, exploit requires running BPF programs with GCC-compiled per-CPU addresses.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Denial Of Service, Privilege Escalation
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 per-CPU address resolution in BPF x86 extended registers.

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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