---
id: CVE-2026-31694
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fuse: reject oversized dirents in page cache

  fuse_add_dirent_to_cache() computes a serialized dirent size from the
  server-controlled namelen field and copies the diren…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fuse: reject oversized dirents in page cache

  fuse_add_dirent_to_cache() computes a serialized dirent size from the
  server-controlled namelen field and copies the diren…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.20, < 6.6.136'
  - 'linux_kernel >= 6.7, < 6.12.84'
  - 'linux_kernel >= 6.13, < 6.18.25'
  - 'linux_kernel >= 6.19, < 7.0.2'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.2
published: '2026-05-01'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-31694'
references:
  - url: 'https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - exploit-available
epss: 0.00173
epssPercentile: 0.05968
ingestedAt: '2026-07-02T15:38:24.962Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/0xCyberstan/CVE-2026-31694-POC'
  checkedAt: '2026-09-26T09:05:41.868Z'
exploitAvailable: true
---

## Overview

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

fuse: reject oversized dirents in page cache

fuse_add_dirent_to_cache() computes a serialized dirent size from the
server-controlled namelen field and copies the dirent into a single
page-cache page. The existing logic only checks whether the dirent fits
in the remaining space of the current page and advances to a fresh page
if not. It never checks whether the dirent itself exceeds PAGE_SIZE.

As a result, a malicious FUSE server can return a dirent with
namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB
page systems this causes memcpy() to overflow the cache page by 24 bytes
into the following kernel page.

Reject dirents that cannot fit in a single page before copying them into
the readdir cache.

## Affected

- `linux_kernel >= 4.20, < 6.6.136`
- `linux_kernel >= 6.7, < 6.12.84`
- `linux_kernel >= 6.13, < 6.18.25`
- `linux_kernel >= 6.19, < 7.0.2`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.2`