CVE-2026-31694Public exploit

Local privilege escalation via oversized FUSE dirents

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds write in the Linux kernel FUSE readdir cache allows local users to corrupt adjacent kernel page memory. fuse_add_dirent_to_cache() copies a server-sized directory entry into one cache page without rejecting records larger than PAGE_SIZE. A malicious FUSE server and a 4 KiB page system are required; the resulting 24-byte overwrite enables local privilege escalation.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux kernel FUSE readdir cache allows local users to corrupt adjacent kernel page memory. fuse_add_dirent_to_cache() copies a server-sized directory entry into one cache page without rejecting records larger than PAGE_SIZE. A malicious FUSE server and a 4 KiB page system are required; the resulting 24-byte overwrite enables local privilege escalation.

The record

CVE
CVE-2026-31694
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.20
  2. Affected versionversion=69e34551152a286f827d54dcb5700da6aeaac1fb <45c05af36311624c1148123caeb011312495d86b
  3. Affected versionversion=69e34551152a286f827d54dcb5700da6aeaac1fb <474ce83c96a55f2eeb14dee2be375eeadfdacdf5
  4. Affected versionversion=69e34551152a286f827d54dcb5700da6aeaac1fb <51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
  5. Affected versionversion=69e34551152a286f827d54dcb5700da6aeaac1fb <7de93abfaae1b2dc94da8a07a36421bd073f1d8f
  6. Affected versionversion=69e34551152a286f827d54dcb5700da6aeaac1fb <d23ad78bfd205eac26766e38ba7d79f279131098

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.20; version=69e34551152a286f827d54dcb5700da6aeaac1fb <45c05af36311624c1148123caeb011312495d86b; version=69e34551152a286f827d54dcb5700da6aeaac1fb <474ce83c96a55f2eeb14dee2be375eeadfdacdf5; version=69e34551152a286f827d54dcb5700da6aeaac1fb <51a8de6c50bf947c8f534cd73da4c8f0a13e7bed; version=69e34551152a286f827d54dcb5700da6aeaac1fb <7de93abfaae1b2dc94da8a07a36421bd073f1d8f; version=69e34551152a286f827d54dcb5700da6aeaac1fb <d23ad78bfd205eac26766e38ba7d79f279131098

Published CVSS scores

7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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