CVE-2026-72083 (GCVE-0-2026-72083)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-19 21:19
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: 4949314c7283ea4f9ade182ca599583b89f7edd6
Version: d2227f84ba0e97906153ac83db13213fb2e3938d
Version: 3.2.9   ≤
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          "value": "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 \u003e 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."
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:N - On LIO/iSCSI storage servers and appliances, a remote initiator sends PERSISTENT_RESERVE_OUT with REGISTER AND MOVE over TCP (port 3260); iscsit_process_scsi_cmd()\u2192target_execute_cmd()\u2192target_scsi3_emulate_pr_out()\u2192core_scsi3_emulate_pro_register_and_move() with no local access required.\nAC:L - The attacker fully controls the PR-OUT parameter list length (\u003e4096 to force vmap/vunmap), iSCSI TransportID format 01b with ISID, and can establish prerequisite PR registration and reservation via prior SCSI commands on the same session; no uncontrollable race or layout dependency exists.\nPR:N - Exploitation requires only the ability to act as a network SCSI/iSCSI client with LUN access to an exported target; no Linux UID, capability, or init-namespace root on the storage server is needed\u2014only standard iSCSI initiator connectivity (CHAP/ACL when configured).\nUI:N - Triggering is fully automated once an iSCSI session exists: the attacker issues scripted REGISTER, RESERVE, then REGISTER AND MOVE commands with a crafted \u003e4 KiB parameter list; no victim mount, click, or other interactive action is required.\nS:U - The UAF corrupts kernel heap state inside the target-core PR handler on the storage host; impact stays within that kernel security domain and does not inherently cross VM, container, or IOMMU boundaries (standard host compromise, not escape).\nC:H - After vunmap(), iport_ptr aliases freed kernel virtual address space and is dereferenced in strcmp(), __core_scsi3_locate_pr_reg(), and snprintf() into pr_reg_isid; per kernel CVSS guidance, UAF reads enable arbitrary kernel memory disclosure when uncertain.\nI:H - UAF reads of attacker-influenced unmapped PR-OUT data drive strcmp-based registration matching and snprintf copies into persistent kernel pr_reg structures; memory corruption/UAF is scored High for integrity because it can be leveraged for control-flow or state manipulation.\nA:H - Dereferencing iport_ptr after transport_kunmap_data_sg() vunmap() on multi-page buffers causes immediate invalid kernel virtual address accesses (oops/panic) on every qualifying REGISTER AND MOVE; UAF availability impact is High per kernel guidance even before full exploit development."
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        "dateUpdated": "2026-08-17T05:40:05.325Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"
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        {
          "url": "https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"
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        {
          "url": "https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"
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        {
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          "url": "https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"
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      "title": "scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72083",
    "datePublished": "2026-08-15T05:52:32.045Z",
    "dateReserved": "2026-08-09T03:40:39.904Z",
    "dateUpdated": "2026-10-19T21:19:26.910Z",
    "state": "PUBLISHED"
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scripted REGISTER, RESERVE, then REGISTER AND MOVE commands with a crafted \u003e4 KiB parameter list; no victim mount, click, or other interactive action is required.\\nS:U - The UAF corrupts kernel heap state inside the target-core PR handler on the storage host; impact stays within that kernel security domain and does not inherently cross VM, container, or IOMMU boundaries (standard host compromise, not escape).\\nC:H - After vunmap(), iport_ptr aliases freed kernel virtual address space and is dereferenced in strcmp(), __core_scsi3_locate_pr_reg(), and snprintf() into pr_reg_isid; per kernel CVSS guidance, UAF reads enable arbitrary kernel memory disclosure when uncertain.\\nI:H - UAF reads of attacker-influenced unmapped PR-OUT data drive strcmp-based registration matching and snprintf copies into persistent kernel pr_reg structures; memory corruption/UAF is scored High for integrity because it can be leveraged for control-flow or state manipulation.\\nA:H - Dereferencing iport_ptr after transport_kunmap_data_sg() vunmap() on multi-page buffers causes immediate invalid kernel virtual address accesses (oops/panic) on every qualifying REGISTER AND MOVE; UAF availability impact is High per kernel guidance even before full exploit development.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4949314c7283ea4f9ade182ca599583b89f7edd6\", \"lessThan\": \"7d56f5c868d92c9d504a34a3ea450bce481c7f63\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4949314c7283ea4f9ade182ca599583b89f7edd6\", \"lessThan\": \"59a2a5a37dc49a641ad6bc64aee34e5a61025ffd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4949314c7283ea4f9ade182ca599583b89f7edd6\", \"lessThan\": \"9f8076cc73dfa6b10155978c160587e986b22169\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"lessThan\": \"3.3\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/target/target_core_pr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/target/target_core_pr.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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 \u003e 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:40:05.325Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72083\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:19:26.910Z\", \"dateReserved\": \"2026-08-09T03:40:39.904Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:52:32.045Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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