CVE-2026-64262

Local FUSE operation hangs via leaked request reference

Published Jul 25, 2026 · Updated Jul 25, 2026

Denial of service in Linux Kernel 6.14 through 6.18.38 and 6.19 through 7.1.3 allows local users to hang FUSE operations. On canceled io_uring task work, fuse_uring_send_in_task() routes the entry through fuse_uring_send() without ending the referenced fuse_req, leaving it hashed and its background counter undischarged. When a local user can issue FUSE requests through io_uring, the initiating thread can remain in D-state for the connection lifetime, and repeated cancellations can stall later background operations.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel 6.14 through 6.18.38 and 6.19 through 7.1.3 allows local users to hang FUSE operations. On canceled io_uring task work, fuse_uring_send_in_task() routes the entry through fuse_uring_send() without ending the referenced fuse_req, leaving it hashed and its background counter undischarged. When a local user can issue FUSE requests through io_uring, the initiating thread can remain in D-state for the connection lifetime, and repeated cancellations can stall later background operations.

The record

CVE
CVE-2026-64262
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
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=c2c9af9a0b13261c36909036057a116f2edb5e1a <4f45f276d5b4412eade6f74f2e37f3adba0473ed
  3. Affected versionversion=c2c9af9a0b13261c36909036057a116f2edb5e1a <bb476ef8e1027a9d509fbaaf81f5061a07e9e5a7
  4. Affected versionversion=c2c9af9a0b13261c36909036057a116f2edb5e1a <bea4fe98204b6ce7eb8e29f7bf867dd7619b3ddd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=c2c9af9a0b13261c36909036057a116f2edb5e1a <4f45f276d5b4412eade6f74f2e37f3adba0473ed; version=c2c9af9a0b13261c36909036057a116f2edb5e1a <bb476ef8e1027a9d509fbaaf81f5061a07e9e5a7; version=c2c9af9a0b13261c36909036057a116f2edb5e1a <bea4fe98204b6ce7eb8e29f7bf867dd7619b3ddd

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

No sourced classifications are available.

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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