{"id":"CVE-2026-72083","title":"scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE\n\ncore_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT\nparameter list with t…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 7d56f5c868d92c9d504a34a3ea450bce481c7f63","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 59a2a5a37dc49a641ad6bc64aee34e5a61025ffd","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 9f8076cc73dfa6b10155978c160587e986b22169","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < a040004846f1fbe687f6ec76d9ccc27b4ead42e4","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 05b3e37433cf2eaf8867f1c16528aa347bb212ab","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < cb7bdae7fba404852ade34b0c1445fbaf3e54fbb","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < ef2ee18fec92088c7d8877baf7674e89389ccd66","Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < fda6a1f3c3d7047b5ce5654487649c2daa738bfc","Linux d2227f84ba0e97906153ac83db13213fb2e3938d","Linux >= 3.2.9 < 3.3","Linux 3.3"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:51:39.405960Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:20.055Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72083","references":[{"url":"https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"},{"url":"https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"},{"url":"https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"},{"url":"https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"},{"url":"https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab"},{"url":"https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb"},{"url":"https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66"},{"url":"https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"}],"tags":["cve.org"],"epss":0.00724,"epssPercentile":0.53134,"ingestedAt":"2026-10-16T17:24:46.877Z","slug":"CVE-2026-72083","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE\n\ncore_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT\nparameter list with transport_kmap_data_sg() and parses the destination\nTransportID with target_parse_pr_out_transport_id(). For an iSCSI\nTransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns\nthe ISID in iport_ptr as a raw pointer into that mapped buffer.\n\nThe function then unmaps the buffer with transport_kunmap_data_sg() before\ndereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and\ncore_scsi3_alloc_registration(). When the parameter list spans more than\none page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses\nvmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual\naddress backing iport_ptr is torn down and every subsequent dereference is\na use-after-free read of the unmapped region.\n\nKeep the parameter list mapped until iport_ptr is no longer needed: drop\nthe early transport_kunmap_data_sg() and unmap once on the success path,\nright before returning. The error paths already unmap through the existing\n\"if (buf) transport_kunmap_data_sg(cmd)\" at the out: label, which now runs\non every post-map error exit because buf is no longer cleared early. Only\nreads of the mapping happen while spinlocks are held; the map and unmap\ncalls remain outside any lock. The sibling caller\ncore_scsi3_decode_spec_i_port() already uses the buffer before unmapping it\nand is left unchanged.\n\n## Affected\n\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 7d56f5c868d92c9d504a34a3ea450bce481c7f63`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 59a2a5a37dc49a641ad6bc64aee34e5a61025ffd`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 9f8076cc73dfa6b10155978c160587e986b22169`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < a040004846f1fbe687f6ec76d9ccc27b4ead42e4`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < 05b3e37433cf2eaf8867f1c16528aa347bb212ab`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < cb7bdae7fba404852ade34b0c1445fbaf3e54fbb`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < ef2ee18fec92088c7d8877baf7674e89389ccd66`\n- `Linux >= 4949314c7283ea4f9ade182ca599583b89f7edd6 < fda6a1f3c3d7047b5ce5654487649c2daa738bfc`\n- `Linux d2227f84ba0e97906153ac83db13213fb2e3938d`\n- `Linux >= 3.2.9 < 3.3`\n- `Linux 3.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}