CVE-2026-43054

LUN removal hang via undrained reset commands

Published May 1, 2026 · Updated May 1, 2026

Resource-release error in affected Linux Kernel versions allows local users to hang configfs LUN removal during SCSI error recovery. tcm_loop_target_reset() returns SUCCESS without draining in-flight commands, so queuecommand reuses a scsi_cmnd and zeroes se_lun and lun_ref_active before deferred completion releases the prior LUN reference. The path requires local access and tcm_loop SCSI error recovery; the leaked reference leaves transport_clear_lun_ref() waiting indefinitely and blocks LUN unlink in D-state.

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

Resource-release error in affected Linux Kernel versions allows local users to hang configfs LUN removal during SCSI error recovery. tcm_loop_target_reset() returns SUCCESS without draining in-flight commands, so queuecommand reuses a scsi_cmnd and zeroes se_lun and lun_ref_active before deferred completion releases the prior LUN reference. The path requires local access and tcm_loop SCSI error recovery; the leaked reference leaves transport_clear_lun_ref() waiting indefinitely and blocks LUN unlink in D-state.

The record

CVE
CVE-2026-43054
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=5.13
  2. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <05ac3754467363558a0a54ae4bb7c89b2c9574cf
  3. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <103f79e4949513247d763c6e7f3cbbf62017afdf
  4. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <1333eee56cdf3f0cf67c6ab4114c2c9e0a952026
  5. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <15f5241d5a52364a7e7867b49128b0442dbcad9d
  6. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <757c43c692294cdfad31390accc0e90429b2ef8a
  7. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <7cbd69aaa507b1245240a28022bf5da0f07c68d9
  8. Affected versionversion=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <a836054ea81014117ec6b73529a21626a9e1f829

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <05ac3754467363558a0a54ae4bb7c89b2c9574cf; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <103f79e4949513247d763c6e7f3cbbf62017afdf; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <1333eee56cdf3f0cf67c6ab4114c2c9e0a952026; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <15f5241d5a52364a7e7867b49128b0442dbcad9d; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <757c43c692294cdfad31390accc0e90429b2ef8a; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <7cbd69aaa507b1245240a28022bf5da0f07c68d9; version=e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 <a836054ea81014117ec6b73529a21626a9e1f829

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS: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

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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-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

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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