CVE-2025-68186
kernel: Linux kernel: Denial of Service in ring-buffer component
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · December 16, 2025
Updated · June 30, 2026
Description
A flaw was found in the Linux kernel. An issue in the ring-buffer component, specifically within the ring_buffer_map_get_reader() function, can lead to an incorrect warning. This occurs when a reader catches up to a writer, causing the rb_get_reader_page() function to return NULL unexpectedly. A local user could exploit this to cause a Denial of Service (DoS).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-253 · Incorrect Check of Function Return Value