{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43054", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.980Z", "datePublished": "2026-05-01T14:15:47.396Z", "dateUpdated": "2026-05-01T14:15:47.396Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T14:15:47.396Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/loopback/tcm_loop.c"], "versions": [{"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "757c43c692294cdfad31390accc0e90429b2ef8a", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "103f79e4949513247d763c6e7f3cbbf62017afdf", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "15f5241d5a52364a7e7867b49128b0442dbcad9d", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "7cbd69aaa507b1245240a28022bf5da0f07c68d9", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "a836054ea81014117ec6b73529a21626a9e1f829", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "05ac3754467363558a0a54ae4bb7c89b2c9574cf", "status": "affected", "versionType": "git"}, {"version": "e0eb5d38b732b011cd9ed5b1bf9f59b83c2500d3", "lessThan": "1333eee56cdf3f0cf67c6ab4114c2c9e0a952026", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/loopback/tcm_loop.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/757c43c692294cdfad31390accc0e90429b2ef8a"}, {"url": "https://git.kernel.org/stable/c/103f79e4949513247d763c6e7f3cbbf62017afdf"}, {"url": "https://git.kernel.org/stable/c/15f5241d5a52364a7e7867b49128b0442dbcad9d"}, {"url": "https://git.kernel.org/stable/c/7cbd69aaa507b1245240a28022bf5da0f07c68d9"}, {"url": "https://git.kernel.org/stable/c/a836054ea81014117ec6b73529a21626a9e1f829"}, {"url": "https://git.kernel.org/stable/c/05ac3754467363558a0a54ae4bb7c89b2c9574cf"}, {"url": "https://git.kernel.org/stable/c/1333eee56cdf3f0cf67c6ab4114c2c9e0a952026"}], "title": "scsi: target: tcm_loop: Drain commands in target_reset handler", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-43054", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:51.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/05ac3754467363558a0a54ae4bb7c89b2c9574cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/103f79e4949513247d763c6e7f3cbbf62017afdf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1333eee56cdf3f0cf67c6ab4114c2c9e0a952026"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15f5241d5a52364a7e7867b49128b0442dbcad9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/757c43c692294cdfad31390accc0e90429b2ef8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7cbd69aaa507b1245240a28022bf5da0f07c68d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a836054ea81014117ec6b73529a21626a9e1f829"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}

{}