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CVE-2026-80691 (GCVE-0-2026-80691)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22
VLAI
Title
scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE In the iblock_execute_pr_out() function, PRO_PREEMPT, PRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability checks through ops->pr_clear. The error check allows unimplemented hooks to pass through the gate, resulting dereferencing a NULL function pointer. Check whether the hooks that need to be called are supported.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < 3c60a8b4037dc35e365658fcbcb349a5d742ff49 (git)
Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < a326b19cfb7775378b50acaa8d836ba44e29b4c2 (git)
Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1 (git)
Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < f15bcf9a99b1b2683fcfa005b9b3680b5600581f (git)
Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < 9c33222bd387312874fbe36ca8002e5c945b9653 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/target/target_core_iblock.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.5",
                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE\n\nIn the iblock_execute_pr_out() function, PRO_PREEMPT,\nPRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability\nchecks through ops-\u003epr_clear. The error check allows unimplemented hooks\nto pass through the gate, resulting dereferencing a NULL function\npointer.\n\nCheck whether the hooks that need to be called are supported."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:N - The bug is reached when a remote SCSI initiator sends PERSISTENT RESERVE OUT (PRO_PREEMPT, PRO_PREEMPT_AND_ABORT, or PRO_RELEASE) to a LIO target exporting an iblock LUN over iSCSI/FC/IB fabrics; iscsit_handle_scsi_cmd() drives transport_generic_new_cmd() to target_scsi3_emulate_pr_out() and iblock_execute_pr_out() without local shell access.\nAC:L - After an admin enables iblock PR passthrough (TRANSPORT_FLAG_PASSTHROUGH_PGR) on a backing block device with pr_ops, any authenticated or misconfigured unauthenticated initiator can deterministically issue the affected SCSI service actions; no races or victim timing are required beyond normal target I/O.\nPR:N - Exploitation requires only the ability to complete an iSCSI (or equivalent fabric) login and submit SCSI commands to the exposed LUN; it does not require Linux UID, capabilities, or root on the target host, and targets are often deployed with authentication disabled or open demo ACLs.\nUI:N - No interactive victim action is needed; the attacker triggers the NULL function-pointer dereference solely by sending a crafted PERSISTENT RESERVE OUT CDB and 24-byte parameter list over the storage network protocol.\nS:U - Impact is a kernel oops/panic on the storage target host running LIO; it does not cross VM, container, or IOMMU boundaries and stays within the kernel\u0027s single security authority.\nC:N - The failure is a direct NULL function-pointer call (ops-\u003epr_preempt or ops-\u003epr_release) when the wrong pr_clear guard passes; this causes an immediate kernel fault with no out-of-bounds read, use-after-free, or attacker-controlled memory disclosure primitive.\nI:N - The bug does not modify user data, on-disk metadata, or kernel memory contents; it only attempts to invoke a missing callback and crashes, providing no arbitrary write or code-execution primitive beyond the fault itself.\nA:H - Dereferencing a NULL block-layer PR callback from kernel context causes an oops or panic on the target server, denying all storage services hosted on that node until reboot and potentially taking down co-located workloads."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:14.617Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/3c60a8b4037dc35e365658fcbcb349a5d742ff49"
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          "url": "https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2"
        },
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          "url": "https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653"
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      ],
      "title": "scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80691",
    "datePublished": "2026-08-28T06:52:54.933Z",
    "dateReserved": "2026-08-26T14:34:25.785Z",
    "dateUpdated": "2026-08-29T06:22:14.617Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-16",
      "epss": "0.00446",
      "percentile": "0.37943"
    },
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      "cve": "CVE-2026-80691",
      "id": "msrc_CVE-2026-80691",
      "initial_release_date": "2026-08-29T01:03:41.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80691.json",
      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T15:07:40+00:00",
      "cve": "CVE-2026-80691",
      "id": "CVE-2026-80691",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "90",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE",
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    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:09:47Z",
      "cve": "CVE-2026-80691",
      "id": "CVE-2026-80691",
      "initial_release_date": "2026-08-28T16:34:02Z",
      "product_status:known_affected": "114",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80691",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80691.json",
      "version": "6"
    }
  }
}



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  • 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.
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  • 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.


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