---
id: CVE-2025-68376
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  coresight: ETR: Fix ETR buffer use-after-free issue

  When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed
  and enabled again, currently sysfs_buf will poi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  coresight: ETR: Fix ETR buffer use-after-free issue

  When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed
  and enabled again, currently sysfs_buf will poi…
severity: none
published: '2025-12-24'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T11:10:00.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68376'
references:
  - url: 'https://git.kernel.org/stable/c/35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/70acbc9c77686b7a521af6d7a543dcd9c324cf07'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cda077a19f5c8d6ec61e5b97deca203d95e3a422'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d5d130835b417c7bfd6c942f0149e34397d4463'
  - url: 'https://git.kernel.org/stable/c/4e83434247ff8005a0b9a1ee997864abf8f259ec'
tags:
  - nvd
  - cve.org
epss: 0.00214
epssPercentile: 0.11709
ingestedAt: '2026-10-13T11:23:51.155Z'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bd2767ec3df2775bc336f441f9068a989ccb919d <
    5d5d130835b417c7bfd6c942f0149e34397d4463
  - >-
    Linux >= bd2767ec3df2775bc336f441f9068a989ccb919d <
    4e83434247ff8005a0b9a1ee997864abf8f259ec
  - >-
    Linux >= bd2767ec3df2775bc336f441f9068a989ccb919d <
    70acbc9c77686b7a521af6d7a543dcd9c324cf07
  - >-
    Linux >= bd2767ec3df2775bc336f441f9068a989ccb919d <
    cda077a19f5c8d6ec61e5b97deca203d95e3a422
  - >-
    Linux >= bd2767ec3df2775bc336f441f9068a989ccb919d <
    35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3
  - Linux fdd3ceb0001da6768bede9779a0190a42e65c404
  - Linux >= 6.5.8 < 6.6
  - Linux 6.6
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

coresight: ETR: Fix ETR buffer use-after-free issue

When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed
and enabled again, currently sysfs_buf will point to the newly
allocated memory(buf_new) and free the old memory(buf_old). But the
etr_buf that is being used by the ETR remains pointed to buf_old, not
updated to buf_new. In this case, it will result in a memory
use-after-free issue.

Fix this by checking ETR's mode before updating and releasing buf_old,
if the mode is CS_MODE_SYSFS, then skip updating and releasing it.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.