CVE-2026-64061Network attack vector

Remote kernel memory corruption via premature sink-folio release

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux Kernel netfs allows remote attackers to corrupt kernel memory through crafted network filesystem replies. netfs_read_gaps() drops the sink folio before netfs_wait_for_read() completes while an ITER_BVEC iterator still references the freed page. Normal I/O on an existing SMB, NFS, 9p, or Ceph mount is required; malicious server replies enable arbitrary kernel reads, controlled heap corruption, code execution, or a host panic.

CVSS severity9.8
Critical
EPSS probability0.47%
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 Linux Kernel netfs allows remote attackers to corrupt kernel memory through crafted network filesystem replies. netfs_read_gaps() drops the sink folio before netfs_wait_for_read() completes while an ITER_BVEC iterator still references the freed page. Normal I/O on an existing SMB, NFS, 9p, or Ceph mount is required; malicious server replies enable arbitrary kernel reads, controlled heap corruption, code execution, or a host panic.

The record

CVE
CVE-2026-64061
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b
  3. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <3e5dd91b87a8b1450217b56a336bee315f40da7d
  4. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <412e8bad48967fd34295866636c028befd27d8b9
  5. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <d4f4bc87c76511cf2532448b0fa40c25e894bd7d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <3e5dd91b87a8b1450217b56a336bee315f40da7d; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <412e8bad48967fd34295866636c028befd27d8b9; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <d4f4bc87c76511cf2532448b0fa40c25e894bd7d

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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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