{"id":"CVE-2026-72083","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72083","summary":"scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE","details":"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 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.","published":"2026-08-15T05:52:32.045Z","modified":"2026-08-16T03:48:31.778046760Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.261"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72083.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72083"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-16T03:48:31.778046760Z"}}