CVE-2026-43054 (GCVE-0-2026-43054)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-11-06 15:32
VLAI
Title
scsi: target: tcm_loop: Drain commands in target_reset handler
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 15:27 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 757c43c692294cdfad31390accc0e90429b2ef8a (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 103f79e4949513247d763c6e7f3cbbf62017afdf (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 15f5241d5a52364a7e7867b49128b0442dbcad9d (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 7cbd69aaa507b1245240a28022bf5da0f07c68d9 (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < a836054ea81014117ec6b73529a21626a9e1f829 (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 05ac3754467363558a0a54ae4bb7c89b2c9574cf (git)
Affected: e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3 , < 1333eee56cdf3f0cf67c6ab4114c2c9e0a952026 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: tcm_loop: Drain commands in target_reset handler\n\ntcm_loop_target_reset() violates the SCSI EH contract: it returns SUCCESS\nwithout draining any in-flight commands.  The SCSI EH documentation\n(scsi_eh.rst) requires that when a reset handler returns SUCCESS the driver\nhas made lower layers \"forget about timed out scmds\" and is ready for new\ncommands.  Every other SCSI LLD (virtio_scsi, mpt3sas, ipr, scsi_debug,\nmpi3mr) enforces this by draining or completing outstanding commands before\nreturning SUCCESS.\n\nBecause tcm_loop_target_reset() doesn\u0027t drain, the SCSI EH reuses in-flight\nscsi_cmnd structures for recovery commands (e.g. TUR) while the target core\nstill has async completion work queued for the old se_cmd.  The memset in\nqueuecommand zeroes se_lun and lun_ref_active, causing\ntransport_lun_remove_cmd() to skip its percpu_ref_put().  The leaked LUN\nreference prevents transport_clear_lun_ref() from completing, hanging\nconfigfs LUN unlink forever in D-state:\n\n  INFO: task rm:264 blocked for more than 122 seconds.\n  rm              D    0   264    258 0x00004000\n  Call Trace:\n   __schedule+0x3d0/0x8e0\n   schedule+0x36/0xf0\n   transport_clear_lun_ref+0x78/0x90 [target_core_mod]\n   core_tpg_remove_lun+0x28/0xb0 [target_core_mod]\n   target_fabric_port_unlink+0x50/0x60 [target_core_mod]\n   configfs_unlink+0x156/0x1f0 [configfs]\n   vfs_unlink+0x109/0x290\n   do_unlinkat+0x1d5/0x2d0\n\nFix this by making tcm_loop_target_reset() actually drain commands:\n\n 1. Issue TMR_LUN_RESET via tcm_loop_issue_tmr() to drain all commands that\n    the target core knows about (those not yet CMD_T_COMPLETE).\n\n 2. Use blk_mq_tagset_busy_iter() to iterate all started requests and\n    flush_work() on each se_cmd \u2014 this drains any deferred completion work\n    for commands that already had CMD_T_COMPLETE set before the TMR (which\n    the TMR skips via __target_check_io_state()).  This is the same pattern\n    used by mpi3mr, scsi_debug, and libsas to drain outstanding commands\n    during reset."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: target: tcm_loop: Drenar comandos en el gestor target_reset\n\ntcm_loop_target_reset() viola el contrato SCSI EH: devuelve SUCCESS sin drenar ning\u00fan comando en curso. La documentaci\u00f3n SCSI EH (scsi_eh.rst) requiere que cuando un gestor de reinicio devuelve SUCCESS, el controlador haya hecho que las capas inferiores \u2019olviden los scmds con tiempo de espera agotado\u2019 y est\u00e9 listo para nuevos comandos. Todos los dem\u00e1s SCSI LLD (virtio_scsi, mpt3sas, ipr, scsi_debug, mpi3mr) aplican esto drenando o completando los comandos pendientes antes de devolver SUCCESS.\n\nDebido a que tcm_loop_target_reset() no drena, el SCSI EH reutiliza las estructuras scsi_cmnd en curso para comandos de recuperaci\u00f3n (p. ej., TUR) mientras el n\u00facleo de destino todav\u00eda tiene trabajo de finalizaci\u00f3n as\u00edncrono en cola para el antiguo se_cmd. El memset en queuecommand pone a cero se_lun y lun_ref_active, lo que hace que transport_lun_remove_cmd() omita su percpu_ref_put(). La referencia LUN filtrada impide que transport_clear_lun_ref() se complete, dejando el desvinculado de LUN de configfs colgado para siempre en estado D:\n\n  INFO: tarea rm:264 bloqueada durante m\u00e1s de 122 segundos.\n  rm              D    0   264    258 0x 00004000\n  Rastro de llamada:\n   __schedule+0x3d0/0x8e0\n   schedule+0x36/0xf0\n   transport_clear_lun_ref+0x78/0x90 [target_core_mod]\n   core_tpg_remove_lun+0x28/0xb0 [target_core_mod]\n   target_fabric_port_unlink+0x50/0x60 [target_core_mod]\n   configfs_unlink+0x156/0x1f0 [configfs]\n   vfs_unlink+0x109/0x290\n   do_unlinkat+0x1d5/0x2d0\n\nSolucione esto haciendo que tcm_loop_target_reset() realmente drene los comandos:\n\n 1. Emitir TMR_LUN_RESET a trav\u00e9s de tcm_loop_issue_tmr() para drenar todos los comandos que el n\u00facleo de destino conoce (aquellos que a\u00fan no son CMD_T_COMPLETE).\n\n 2. Usar blk_mq_tagset_busy_iter() para iterar todas las solicitudes iniciadas y flush_work() en cada se_cmd - esto drena cualquier trabajo de finalizaci\u00f3n diferido para comandos que ya ten\u00edan CMD_T_COMPLETE establecido antes del TMR (que el TMR omite a trav\u00e9s de __target_check_io_state()). Este es el mismo patr\u00f3n utilizado por mpi3mr, scsi_debug y libsas para drenar comandos pendientes durante el reinicio."
          }
        ],
        "id": "CVE-2026-43054",
        "lastModified": "2026-11-11T23:10:00.263",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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                "version": "2.0.3"
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
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                "lang": "en",
                "value": "CWE-772"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T20:49:18+00:00",
      "cve": "CVE-2026-43054",
      "id": "CVE-2026-43054",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "172",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: target: tcm_loop: Drain commands in target_reset handler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43054.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
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              "dateUpdated": "2026-11-06T15:27:28.911Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "programFiles": [
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                  "versionType": "git"
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              "vendor": "Linux",
              "versions": [
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                {
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                  "version": "0",
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                    {
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: tcm_loop: Drain commands in target_reset handler\n\ntcm_loop_target_reset() violates the SCSI EH contract: it returns SUCCESS\nwithout draining any in-flight commands.  The SCSI EH documentation\n(scsi_eh.rst) requires that when a reset handler returns SUCCESS the driver\nhas made lower layers \"forget about timed out scmds\" and is ready for new\ncommands.  Every other SCSI LLD (virtio_scsi, mpt3sas, ipr, scsi_debug,\nmpi3mr) enforces this by draining or completing outstanding commands before\nreturning SUCCESS.\n\nBecause tcm_loop_target_reset() doesn\u0027t drain, the SCSI EH reuses in-flight\nscsi_cmnd structures for recovery commands (e.g. TUR) while the target core\nstill has async completion work queued for the old se_cmd.  The memset in\nqueuecommand zeroes se_lun and lun_ref_active, causing\ntransport_lun_remove_cmd() to skip its percpu_ref_put().  The leaked LUN\nreference prevents transport_clear_lun_ref() from completing, hanging\nconfigfs LUN unlink forever in D-state:\n\n  INFO: task rm:264 blocked for more than 122 seconds.\n  rm              D    0   264    258 0x00004000\n  Call Trace:\n   __schedule+0x3d0/0x8e0\n   schedule+0x36/0xf0\n   transport_clear_lun_ref+0x78/0x90 [target_core_mod]\n   core_tpg_remove_lun+0x28/0xb0 [target_core_mod]\n   target_fabric_port_unlink+0x50/0x60 [target_core_mod]\n   configfs_unlink+0x156/0x1f0 [configfs]\n   vfs_unlink+0x109/0x290\n   do_unlinkat+0x1d5/0x2d0\n\nFix this by making tcm_loop_target_reset() actually drain commands:\n\n 1. Issue TMR_LUN_RESET via tcm_loop_issue_tmr() to drain all commands that\n    the target core knows about (those not yet CMD_T_COMPLETE).\n\n 2. Use blk_mq_tagset_busy_iter() to iterate all started requests and\n    flush_work() on each se_cmd \u2014 this drains any deferred completion work\n    for commands that already had CMD_T_COMPLETE set before the TMR (which\n    the TMR skips via __target_check_io_state()).  This is the same pattern\n    used by mpi3mr, scsi_debug, and libsas to drain outstanding commands\n    during reset."
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}



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