CVE-2026-46256

System hang via NFS direct-reclaim recursion

Published Jun 3, 2026 · Updated Jun 3, 2026

Denial of service in Linux Kernel 6.12 through 6.18.13 and 6.19 through 6.19.3 allows local users to hang the system. LOCALIO page-cache allocations can enter direct reclaim outside GFP_NOFS context, recurse through XFS into nfs_writepages, and deadlock. Exploitation requires local low-privileged access and a same-host NFS client/server using LOCALIO; the bounded consequence is a system hang.

CVSS severity5.5
Medium
EPSS probability0.10%
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 6.12 through 6.18.13 and 6.19 through 6.19.3 allows local users to hang the system. LOCALIO page-cache allocations can enter direct reclaim outside GFP_NOFS context, recurse through XFS into nfs_writepages, and deadlock. Exploitation requires local low-privileged access and a same-host NFS client/server using LOCALIO; the bounded consequence is a system hang.

The record

CVE
CVE-2026-46256
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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=6.12
  2. Affected versionversion=70ba381e1a431245c137ed597ec6a05991c79bd9 <67435d2d8a33a75f9647724952cb1b18279d2e95
  3. Affected versionversion=70ba381e1a431245c137ed597ec6a05991c79bd9 <6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9
  4. Affected versionversion=70ba381e1a431245c137ed597ec6a05991c79bd9 <ae26a4cf2baf0a44c538dc093504d1994b02dade

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=70ba381e1a431245c137ed597ec6a05991c79bd9 <67435d2d8a33a75f9647724952cb1b18279d2e95; version=70ba381e1a431245c137ed597ec6a05991c79bd9 <6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9; version=70ba381e1a431245c137ed597ec6a05991c79bd9 <ae26a4cf2baf0a44c538dc093504d1994b02dade

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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