CVE-2026-72083
Received Received - Intake

BaseFortify

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE core_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT parameter list with transport_kmap_data_sg() and parses the destination TransportID with target_parse_pr_out_transport_id(). For an iSCSI TransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns the ISID in iport_ptr as a raw pointer into that mapped buffer. The function then unmaps the buffer with transport_kunmap_data_sg() before dereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and core_scsi3_alloc_registration(). When the parameter list spans more than one page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses vmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual address backing iport_ptr is torn down and every subsequent dereference is a use-after-free read of the unmapped region. Keep the parameter list mapped until iport_ptr is no longer needed: drop the early transport_kunmap_data_sg() and unmap once on the success path, right before returning. The error paths already unmap through the existing "if (buf) transport_kunmap_data_sg(cmd)" at the out: label, which now runs on every post-map error exit because buf is no longer cleared early. Only reads of the mapping happen while spinlocks are held; the map and unmap calls remain outside any lock. The sibling caller core_scsi3_decode_spec_i_port() already uses the buffer before unmapping it and is left unchanged.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-72083
EUVD
EUVD-2026-59041

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a use-after-free flaw in the Linux kernel's SCSI target core, specifically in the iSCSI REGISTER AND MOVE functionality. It occurs when the kernel unmaps a memory buffer containing iSCSI session identifiers (ISID) before finishing all operations on that data. This leads to potential memory corruption when the unmapped memory is accessed later.

Detection Guidance

This vulnerability is specific to the Linux kernel's SCSI target core and iSCSI functionality. Detection requires checking kernel logs for related errors or kernel crashes involving scsi target core or iSCSI operations. Commands like dmesg | grep -i 'scsi\|target\|iscsi' or journalctl -k | grep -i 'scsi\|target\|iscsi' may help identify suspicious activity. Ensure your kernel is updated to a patched version.

Impact Analysis

This vulnerability could allow an attacker with access to the system to cause a kernel crash or execute arbitrary code with kernel privileges. This could lead to denial of service, data corruption, or unauthorized access to sensitive information on systems using affected Linux kernel versions.

Mitigation Strategies

Immediately update the Linux kernel to a version that includes the fix for this vulnerability. If updating is not immediately possible, consider disabling iSCSI target functionality if it is not required. Monitor vendor advisories for kernel updates and apply them as soon as they are available.

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