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NVD / CVE Program· CNA Linux

CVE-2026-43054: scsi: target: tcm_loop: Drain commands in target_reset handler

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 05ac3754467363558a0a54ae4bb7c89b2c9574cf, 103f79e4949513247d763c6e7f3cbbf62017afdf, 1333eee56cdf3f0cf67c6ab4114c2c9e0a952026.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 05ac3754467363558a0a54ae4bb7c89b2c9574cf, 103f79e4949513247d763c6e7f3cbbf62017afdf, 1333eee56cdf3f0cf67c6ab4114c2c9e0a952026 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: scsi: target: tcm_loop: Drain commands in target_reset handler tcm_loop_target_reset() violates the SCSI EH contract: it returns SUCCESS without draining any in-flight commands. The SCSI EH documentation (scsi_eh.rst) requires that when a reset handler returns SUCCESS the driver has made lower layers "forget about timed out scmds" and is ready for new commands. Every other SCSI LLD (virtio_scsi, mpt3sas, ipr, scsi_debug, mpi3mr) enforces this by draining or completing outstanding commands before returning SUCCESS. Because tcm_loop_target_reset() doesn't drain, the SCSI EH reuses in-flight scsi_cmnd structures for recovery commands (e.g. TUR) while the target core still has async completion work queued for the old se_cmd. The memset in queuecommand zeroes se_lun and lun_ref_active, causing transport_lun_remove_cmd() to skip its percpu_ref_put(). The leaked LUN reference prevents transport_clear_lun_ref() from completing, hanging configfs LUN unlink forever in D-state: INFO: task rm:264 blocked for more than 122 seconds. rm D 0 264 258 0x00004000 Call Trace: __schedule+0x3d0/0x8e0 schedule+0x36/0xf0 transport_clear_lun_ref+0x78/0x90 [target_core_mod] core_tpg_remove_lun+0x28/0xb0 [target_core_mod] target_fabric_port_unlink+0x50/0x60 [target_core_mod] configfs_unlink+0x156/0x1f0 [configfs] vfs_unlink+0x109/0x290 do_unlinkat+0x1d5/0x2d0 Fix this by making tcm_loop_target_reset() actually drain commands: 1. Issue TMR_LUN_RESET via tcm_loop_issue_tmr() to drain all commands that the target core knows about (those not yet CMD_T_COMPLETE). 2. Use blk_mq_tagset_busy_iter() to iterate all started requests and flush_work() on each se_cmd — this drains any deferred completion work for commands that already had CMD_T_COMPLETE set before the TMR (which the TMR skips via __target_check_io_state()). This is the same pattern used by mpi3mr, scsi_debug, and libsas to drain outstanding commands during reset.

Published
May 1, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2026-43054

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.13affected
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 757c43c692294cdfad31390accc0e90429b2ef8aaffected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 103f79e4949513247d763c6e7f3cbbf62017afdfaffected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 15f5241d5a52364a7e7867b49128b0442dbcad9daffected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 7cbd69aaa507b1245240a28022bf5da0f07c68d9affected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before a836054ea81014117ec6b73529a21626a9e1f829affected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 05ac3754467363558a0a54ae4bb7c89b2c9574cfaffected · git
    • e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 and later · before 1333eee56cdf3f0cf67c6ab4114c2c9e0a952026affected · git
    • before 5.13not affected · semver
    • 5.15.203 and later · up to and including 5.15.*not affected · semver
Affected versions · NVD (7)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.13 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43052May 1, 2026 · wifi: mac80211: check tdls flag in ieee80211_tdls_oper
    28Monitor
  • ← EarlierCVE-2026-43053May 1, 2026 · xfs: close crash window in attr dabtree inactivation
    18Monitor
  • Later →CVE-2026-43055May 1, 2026 · scsi: target: file: Use kzalloc_flex for aio_cmd
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux05ac3754467363558a0a54ae4bb7c89b2c9574cfVendor (CNA)
Linux Linux103f79e4949513247d763c6e7f3cbbf62017afdfVendor (CNA)
Linux Linux1333eee56cdf3f0cf67c6ab4114c2c9e0a952026Vendor (CNA)
Linux Linux15f5241d5a52364a7e7867b49128b0442dbcad9dVendor (CNA)
Linux Linux757c43c692294cdfad31390accc0e90429b2ef8aVendor (CNA)
Linux Linux7cbd69aaa507b1245240a28022bf5da0f07c68d9Vendor (CNA)
Linux Linuxa836054ea81014117ec6b73529a21626a9e1f829Vendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-6400379 days apartscsi: core: Run queues for all non-SDEV_DEL devices from scsi_run_host_queues
    30Monitor
  • CVE-2022-50189317 days aparttools/power turbostat: Fix file pointer leak
    28Monitor
  • CVE-2026-432575 days apartmedia: cx88: Add missing unmap in snd_cx88_hw_params()
    22Monitor
  • CVE-2026-433147 days apartdm: remove fake timeout to avoid leak request
    22Monitor
  • CVE-2026-2329937 days apartBluetooth: purge error queues in socket destructors
    22Monitor
  • CVE-2026-4629238 days apartpmdomain: core: Fix detach procedure for virtual devices in genpd
    22Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-772 · Missing Release of Resource after Effective Lifetime

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records