CVE-2026-89748 Linux Kernel - Race Condition

Linux kernel contains a race condition in simple ring buffer reader swap caused by incorrect retry counter handling in simple_ring_buffer_swap_reader_page(), letting attackers cause ring buffer corruption, exploit requires kernel tracing enabled.

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
Race Condition
Impact
Data Tampering, 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 simple_ring_buffer_swap_reader_page() retry exhaustion.

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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