{"cve":"CVE-2021-47290","nvd":{"published":"2024-05-21T15:15:17.027","modified":"2026-08-04T10:16:56.470","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: Fix NULL dereference on XCOPY completion\n\nCPU affinity control added with commit 39ae3edda325 (\"scsi: target: core:\nMake completion affinity configurable\") makes target_complete_cmd() queue\nwork on a CPU based on se_tpg->se_tpg_wwn->cmd_compl_affinity state.\n\nLIO's EXTENDED COPY worker is a special case in that read/write cmds are\ndispatched using the global xcopy_pt_tpg, which carries a NULL se_tpg_wwn\npointer following initialization in target_xcopy_setup_pt().\n\nThe NULL xcopy_pt_tpg->se_tpg_wwn pointer is dereferenced on completion of\nany EXTENDED COPY initiated read/write cmds. E.g using the libiscsi\nSCSI.ExtendedCopy.Simple test:\n\n  BUG: kernel NULL pointer dereference, address: 00000000000001a8\n  RIP: 0010:target_complete_cmd+0x9d/0x130 [target_core_mod]\n  Call Trace:\n   fd_execute_rw+0x148/0x42a [target_core_file]\n   ? __dynamic_pr_debug+0xa7/0xe0\n   ? target_check_reservation+0x5b/0x940 [target_core_mod]\n   __target_execute_cmd+0x1e/0x90 [target_core_mod]\n   transport_generic_new_cmd+0x17c/0x330 [target_core_mod]\n   target_xcopy_issue_pt_cmd+0x9/0x60 [target_core_mod]\n   target_xcopy_read_source.isra.7+0x10b/0x1b0 [target_core_mod]\n   ? target_check_fua+0x40/0x40 [target_core_mod]\n   ? transport_complete_task_attr+0x130/0x130 [target_core_mod]\n   target_xcopy_do_work+0x61f/0xc00 [target_core_mod]\n\nThis fix makes target_complete_cmd() queue work on se_cmd->cpuid if\nse_tpg_wwn is NULL.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/a47fa41381a09e5997afd762664db4f5f6657e03","https://git.kernel.org/stable/c/e7732c5a19a15a62b0b23fd683a639b0483e1f40","https://git.kernel.org/stable/c/a47fa41381a09e5997afd762664db4f5f6657e03","https://git.kernel.org/stable/c/e7732c5a19a15a62b0b23fd683a639b0483e1f40"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47290","score":0.00464,"percentile":0.40198,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}