CVE-2025-71109

kernel: Linux kernel: Memory corruption in ftrace due to buffer overflow

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · January 14, 2026

Updated · August 21, 2026

Description

A flaw was found in the Linux kernel's ftrace component. This vulnerability occurs because the UASM_i_LA_mostly macro can generate more than two instructions, while the ftrace code expects a maximum of two. This mismatch leads to a buffer overflow, corrupting critical system variables and potentially causing the kernel to hang during boot.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')