CVE-2026-43054

{"id": "CVE-2026-43054", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43054", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T15:27:27.923024Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "757c43c692294cdfad31390accc0e90429b2ef8a", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "103f79e4949513247d763c6e7f3cbbf62017afdf", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "15f5241d5a52364a7e7867b49128b0442dbcad9d", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "7cbd69aaa507b1245240a28022bf5da0f07c68d9", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "a836054ea81014117ec6b73529a21626a9e1f829", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "05ac3754467363558a0a54ae4bb7c89b2c9574cf", "versionType": "git"}, {"status": "affected", "version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "1333eee56cdf3f0cf67c6ab4114c2c9e0a952026", "versionType": "git"}], "programFiles": ["drivers/target/loopback/tcm_loop.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"status": "unaffected", "version": "0", "lessThan": "5.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.168", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/target/loopback/tcm_loop.c"], "defaultStatus": "affected"}]}], "published": "2026-05-01T15:16:51.910", "references": [{"url": "https://git.kernel.org/stable/c/05ac3754467363558a0a54ae4bb7c89b2c9574cf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/103f79e4949513247d763c6e7f3cbbf62017afdf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1333eee56cdf3f0cf67c6ab4114c2c9e0a952026", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/15f5241d5a52364a7e7867b49128b0442dbcad9d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/757c43c692294cdfad31390accc0e90429b2ef8a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7cbd69aaa507b1245240a28022bf5da0f07c68d9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a836054ea81014117ec6b73529a21626a9e1f829", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-772"}]}], "descriptions": [{"lang": "en", "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't 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."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "985804EB-66D2-4D4A-AF5D-D7A87E940EEE", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B", "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F56F925B-BAF8-4F4B-B62F-1496AF19A307", "versionEndExcluding": "6.6.134", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6EF80433-B33B-43C5-8E64-0FA7B8DCE1BC", "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}