CVE-2026-64164

Kernel warning via sleep in atomic tracepoint

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper context handling in Linux Kernel btrfs tracepoints allows local users to trigger a kernel warning during file synchronization. The btrfs_sync_file trace event calls dget_parent() and then dput() while executing in atomic context, where dput() can sleep. Triggering requires local access, an enabled btrfs_sync_file trace event, and btrfs file synchronization; published evidence demonstrates a kernel splat but not a crash.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper context handling in Linux Kernel btrfs tracepoints allows local users to trigger a kernel warning during file synchronization. The btrfs_sync_file trace event calls dget_parent() and then dput() while executing in atomic context, where dput() can sleep. Triggering requires local access, an enabled btrfs_sync_file trace event, and btrfs file synchronization; published evidence demonstrates a kernel splat but not a crash.

The record

CVE
CVE-2026-64164
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476
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=2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a <c32a7e0e3c73c1c0768556a56bd78de9f7b83780
  2. Affected versionversion=32372781d664a9b03c40343e96c29d0a6139f97d <12a0487945c09760a5968d9333383014ea294117
  3. Affected versionversion=4a7bab35fad5251c8cb738161152578cd83b6b9c <d78b0a80eac36879ef5478707135c446920e134b
  4. Affected versionversion=520e8b4bcf872a534a7bf61ccf880047642df296 <4361954f0e158af0530caa1e57f12b531be4658f
  5. Affected versionversion=6.12.83 <6.12.92
  6. Affected versionversion=6.18.24 <6.18.34
  7. Affected versionversion=6.19.14 <6.20
  8. Affected versionversion=6.6.136 <6.6.142
  9. Affected versionversion=7.0
  10. Affected versionversion=a85b46db143fda5869e7d8df8f258ccef5fa1719 <0a96d9a85cd2240481297156b9bb72e10b7a8036
  11. Affected versionversion=a85b46db143fda5869e7d8df8f258ccef5fa1719 <c73370c677646e86fc4b1780fb07027bdf847375
  12. Affected versionversion=c09a7446aab5773f38d6abb25fce99b8e1dfbc97 <26b2290baaf6da6add0f782a100766e686a33f4f
  13. Affected versionversion=d110d7cdb045715c0b45b0dfd974525bb38f653d
  14. Affected versionversion=e252db8ca2a01f82d472091f35d549b313278636 <6279992c9ba2774901c9d4dd4a481162e2534714

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a <c32a7e0e3c73c1c0768556a56bd78de9f7b83780; version=32372781d664a9b03c40343e96c29d0a6139f97d <12a0487945c09760a5968d9333383014ea294117; version=4a7bab35fad5251c8cb738161152578cd83b6b9c <d78b0a80eac36879ef5478707135c446920e134b; version=520e8b4bcf872a534a7bf61ccf880047642df296 <4361954f0e158af0530caa1e57f12b531be4658f; version=6.12.83 <6.12.92; version=6.18.24 <6.18.34; version=6.19.14 <6.20; version=6.6.136 <6.6.142; version=7.0; version=a85b46db143fda5869e7d8df8f258ccef5fa1719 <0a96d9a85cd2240481297156b9bb72e10b7a8036; version=a85b46db143fda5869e7d8df8f258ccef5fa1719 <c73370c677646e86fc4b1780fb07027bdf847375; version=c09a7446aab5773f38d6abb25fce99b8e1dfbc97 <26b2290baaf6da6add0f782a100766e686a33f4f; version=d110d7cdb045715c0b45b0dfd974525bb38f653d; version=e252db8ca2a01f82d472091f35d549b313278636 <6279992c9ba2774901c9d4dd4a481162e2534714

Published CVSS scores

5.5NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

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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