CVE-2026-64065

Local kernel crash via double folio unlock

Published Jul 19, 2026 · Updated Jul 19, 2026

Race condition in the Linux Kernel netfs subsystem allows local users to crash the kernel through concurrent network-filesystem writes. netfs_unlock_abandoned_read_pages() ignores NETFS_RREQ_NO_UNLOCK_FOLIO and unconditionally unlocks a folio that netfs_write_begin() then unlocks again. Triggering requires a local process to win the read/write race on a netfs-backed file; the observed result is a kernel BUG and system service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux Kernel netfs subsystem allows local users to crash the kernel through concurrent network-filesystem writes. netfs_unlock_abandoned_read_pages() ignores NETFS_RREQ_NO_UNLOCK_FOLIO and unconditionally unlocks a folio that netfs_write_begin() then unlocks again. Triggering requires a local process to win the read/write race on a netfs-backed file; the observed result is a kernel BUG and system service interruption.

The record

CVE
CVE-2026-64065
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

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 <51ffb788f074c0a61953086f49008028c1e7b645
  3. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <5ad05b6f5df296ef046589f222bb2587495b991e
  4. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <b63971238beb79cf701dac33c6cefc56c07c89fa
  5. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <dc7832d05deb4d632e8035e3299e31a3528fa0d0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <51ffb788f074c0a61953086f49008028c1e7b645; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <5ad05b6f5df296ef046589f222bb2587495b991e; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <b63971238beb79cf701dac33c6cefc56c07c89fa; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <dc7832d05deb4d632e8035e3299e31a3528fa0d0

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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