CVE-2026-89580 Linux Kernel - Out-of-Bounds Write

Linux kernel contains a buffer overflow caused by a preemptible BPF program reusing a per-CPU perf_callchain_entry buffer during __bpf_get_stack(), letting attackers cause out-of-bounds write, exploit requires running a preemptible BPF program.

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
Out-of-Bounds Write
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 __bpf_get_stack preemption 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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