---
id: CVE-2025-37940
title: 'ftrace: Add cond_resched() to ftrace_graph_set_hash()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ftrace: Add cond_resched() to ftrace_graph_set_hash()

  When the kernel contains a large number of functions that can be traced,
  the loop in ftrace_graph_set_hash() may …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    e5b4ae6f01d4a510d5725eca7254519a1093920d
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    618655d54c5f8af5d57b77491d08c0f0ff77d114
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    dd38803c9088b848c6b56f4f6d7efc4497bfde61
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    8dd7d7280357596ba63dfdb4c1725d9dd24bd42a
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    5d336ac215e5c76e43ef4bca9ba699835e53e2fd
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    1fce9574b9d515bcb8a75379a8053e18602424e3
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    4429535acab750d963fdc3dfcc9e0eee42f4d599
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    72be43ff061a889c6ee648a330a42486cafa15a6
  - >-
    Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 <
    42ea22e754ba4f2b86f8760ca27f6f71da2d982c
  - Linux 4.11
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:45:26.480860Z'
published: '2025-05-20'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:52:08.689Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-37940'
references:
  - url: 'https://git.kernel.org/stable/c/e5b4ae6f01d4a510d5725eca7254519a1093920d'
  - url: 'https://git.kernel.org/stable/c/618655d54c5f8af5d57b77491d08c0f0ff77d114'
  - url: 'https://git.kernel.org/stable/c/dd38803c9088b848c6b56f4f6d7efc4497bfde61'
  - url: 'https://git.kernel.org/stable/c/8dd7d7280357596ba63dfdb4c1725d9dd24bd42a'
  - url: 'https://git.kernel.org/stable/c/5d336ac215e5c76e43ef4bca9ba699835e53e2fd'
  - url: 'https://git.kernel.org/stable/c/1fce9574b9d515bcb8a75379a8053e18602424e3'
  - url: 'https://git.kernel.org/stable/c/4429535acab750d963fdc3dfcc9e0eee42f4d599'
  - url: 'https://git.kernel.org/stable/c/72be43ff061a889c6ee648a330a42486cafa15a6'
  - url: 'https://git.kernel.org/stable/c/42ea22e754ba4f2b86f8760ca27f6f71da2d982c'
tags:
  - cve.org
epss: 0.00162
epssPercentile: 0.05455
ingestedAt: '2026-11-05T22:38:31.896Z'
---

## Overview

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

ftrace: Add cond_resched() to ftrace_graph_set_hash()

When the kernel contains a large number of functions that can be traced,
the loop in ftrace_graph_set_hash() may take a lot of time to execute.
This may trigger the softlockup watchdog.

Add cond_resched() within the loop to allow the kernel to remain
responsive even when processing a large number of functions.

This matches the cond_resched() that is used in other locations of the
code that iterates over all functions that can be traced.

## Affected

- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < e5b4ae6f01d4a510d5725eca7254519a1093920d`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 618655d54c5f8af5d57b77491d08c0f0ff77d114`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < dd38803c9088b848c6b56f4f6d7efc4497bfde61`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 8dd7d7280357596ba63dfdb4c1725d9dd24bd42a`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 5d336ac215e5c76e43ef4bca9ba699835e53e2fd`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 1fce9574b9d515bcb8a75379a8053e18602424e3`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 4429535acab750d963fdc3dfcc9e0eee42f4d599`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 72be43ff061a889c6ee648a330a42486cafa15a6`
- `Linux >= b9b0c831bed2682c2e3e9f5420fb6985549ef020 < 42ea22e754ba4f2b86f8760ca27f6f71da2d982c`
- `Linux 4.11`

## Remediation

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