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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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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "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/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"
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        {
          "url": "https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"
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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": "2026-08-17T05:40:05.325Z",
    "state": "PUBLISHED"
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      "date": "2026-09-04",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72083\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:21:20.167\",\"lastModified\":\"2026-08-17T06:18:07.043\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/target/target_core_pr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\":\"4949314c7283ea4f9ade182ca599583b89f7edd6\",\"lessThan\":\"a040004846f1fbe687f6ec76d9ccc27b4ead42e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4949314c7283ea4f9ade182ca599583b89f7edd6\",\"lessThan\":\"05b3e37433cf2eaf8867f1c16528aa347bb212ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4949314c7283ea4f9ade182ca599583b89f7edd6\",\"lessThan\":\"cb7bdae7fba404852ade34b0c1445fbaf3e54fbb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4949314c7283ea4f9ade182ca599583b89f7edd6\",\"lessThan\":\"ef2ee18fec92088c7d8877baf7674e89389ccd66\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4949314c7283ea4f9ade182ca599583b89f7edd6\",\"lessThan\":\"fda6a1f3c3d7047b5ce5654487649c2daa738bfc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d2227f84ba0e97906153ac83db13213fb2e3938d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.2.9\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/target/target_core_pr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.