CVE-2026-64259

Kernel-memory corruption via premature FUSE request publication

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel fuse-uring component allows local users to corrupt kernel memory via crafted commit SQEs. fuse_uring_add_to_pq() exposes a fuse_req before fuse_uring_send_in_task() finishes copying its data, allowing fuse_uring_commit_fetch() to free the request while memcpy still uses it. Local users who can create a FUSE mount and submit IORING_OP_URING_CMD requests can cause disclosure, corruption, hangs, or a kernel panic without victim interaction.

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

What happened

Use-after-free in the Linux Kernel fuse-uring component allows local users to corrupt kernel memory via crafted commit SQEs. fuse_uring_add_to_pq() exposes a fuse_req before fuse_uring_send_in_task() finishes copying its data, allowing fuse_uring_commit_fetch() to free the request while memcpy still uses it. Local users who can create a FUSE mount and submit IORING_OP_URING_CMD requests can cause disclosure, corruption, hangs, or a kernel panic without victim interaction.

The record

CVE
CVE-2026-64259
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-763, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=6.14
  2. Affected versionversion=c090c8abae4b6b77a1bee116aa6c385456ebef96 <1efd3d474fc0ba74dfd984249bca78807d739812
  3. Affected versionversion=c090c8abae4b6b77a1bee116aa6c385456ebef96 <a635f427d57e2012102ae4886b48d8955c59fb86
  4. Affected versionversion=c090c8abae4b6b77a1bee116aa6c385456ebef96 <e1711479e9068ea31b31353a702a51e639c3d059

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=c090c8abae4b6b77a1bee116aa6c385456ebef96 <1efd3d474fc0ba74dfd984249bca78807d739812; version=c090c8abae4b6b77a1bee116aa6c385456ebef96 <a635f427d57e2012102ae4886b48d8955c59fb86; version=c090c8abae4b6b77a1bee116aa6c385456ebef96 <e1711479e9068ea31b31353a702a51e639c3d059

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-763Release of Invalid Pointer or Reference
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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