CVE-2026-72083 (GCVE-0-2026-72083)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40
VLAI
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: 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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < 7d56f5c868d92c9d504a34a3ea450bce481c7f63 (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < 59a2a5a37dc49a641ad6bc64aee34e5a61025ffd (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < 9f8076cc73dfa6b10155978c160587e986b22169 (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < a040004846f1fbe687f6ec76d9ccc27b4ead42e4 (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < 05b3e37433cf2eaf8867f1c16528aa347bb212ab (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < cb7bdae7fba404852ade34b0c1445fbaf3e54fbb (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < ef2ee18fec92088c7d8877baf7674e89389ccd66 (git)
Affected: 4949314c7283ea4f9ade182ca599583b89f7edd6 , < fda6a1f3c3d7047b5ce5654487649c2daa738bfc (git)
Affected: d2227f84ba0e97906153ac83db13213fb2e3938d (git)
Affected: 3.2.9 , < 3.3 (semver)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "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."
        }
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        {
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            "baseSeverity": "CRITICAL",
            "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/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"
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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": "2026-08-17T05:40:05.325Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.52175"
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        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-72083",
        "lastModified": "2026-08-17T06:18:07.043",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:21:20.167",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-17T20:45:33+00:00",
      "cve": "CVE-2026-72083",
      "id": "CVE-2026-72083",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72083.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:28:48Z",
      "cve": "CVE-2026-72083",
      "id": "CVE-2026-72083",
      "initial_release_date": "2026-08-18T16:55:00Z",
      "product_status:first_fixed": "127",
      "product_status:known_affected": "707",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72083",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72083.json",
      "version": "9"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.