CVE-2026-46005

Service interruption via leaked DAX device references

Published May 27, 2026 · Updated May 27, 2026

Resource leak in Linux Kernel XFS allows local users to exhaust resources and interrupt service when buffer-target allocation fails. After xfs_alloc_buftarg obtains a DAX device reference, its sync_blockdev error path frees the buffer target without calling fs_put_dax. Reachability requires XFS on DAX-backed storage and execution of this error path; the documented consequence is availability loss.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Linux Kernel XFS allows local users to exhaust resources and interrupt service when buffer-target allocation fails. After xfs_alloc_buftarg obtains a DAX device reference, its sync_blockdev error path frees the buffer target without calling fs_put_dax. Reachability requires XFS on DAX-backed storage and execution of this error path; the documented consequence is availability loss.

The record

CVE
CVE-2026-46005
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0
  2. Affected versionversion=6f643c57d57c56d4677bc05f1fca2ef3f249797c <28a6c132b8c6e5eeefa889c4fb43d65b12989d48
  3. Affected versionversion=6f643c57d57c56d4677bc05f1fca2ef3f249797c <29a7b2614357393b176ef06ba5bc3ff5afc8df69
  4. Affected versionversion=6f643c57d57c56d4677bc05f1fca2ef3f249797c <5804cb507233ed767a83ac70527b2f6c4566ec75
  5. Affected versionversion=6f643c57d57c56d4677bc05f1fca2ef3f249797c <5c293a1e1ef0f838772d20ae8afae4cbd87cd3f9
  6. Affected versionversion=6f643c57d57c56d4677bc05f1fca2ef3f249797c <82fb9da6477d08bdab954dc7bc081a41f2f9cae6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=6f643c57d57c56d4677bc05f1fca2ef3f249797c <28a6c132b8c6e5eeefa889c4fb43d65b12989d48; version=6f643c57d57c56d4677bc05f1fca2ef3f249797c <29a7b2614357393b176ef06ba5bc3ff5afc8df69; version=6f643c57d57c56d4677bc05f1fca2ef3f249797c <5804cb507233ed767a83ac70527b2f6c4566ec75; version=6f643c57d57c56d4677bc05f1fca2ef3f249797c <5c293a1e1ef0f838772d20ae8afae4cbd87cd3f9; version=6f643c57d57c56d4677bc05f1fca2ef3f249797c <82fb9da6477d08bdab954dc7bc081a41f2f9cae6

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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