Vulnerability-Lookup

GHSA-MP2W-VVVM-2M46

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80691"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:54Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-mp2w-vvvm-2m46",
  "modified": "2026-08-29T09:30:28Z",
  "published": "2026-08-28T09:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80691"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c60a8b4037dc35e365658fcbcb349a5d742ff49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22

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

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/3c60a8b4037dc35e3…
https://git.kernel.org/stable/c/a326b19cfb7775378…
https://git.kernel.org/stable/c/bdd8a1297ef101bb5…
https://git.kernel.org/stable/c/f15bcf9a99b1b2683…
https://git.kernel.org/stable/c/9c33222bd38731287…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < 3c60a8b4037dc35e365658fcbcb349a5d742ff49 (git) Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < a326b19cfb7775378b50acaa8d836ba44e29b4c2 (git) Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1 (git) Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < f15bcf9a99b1b2683fcfa005b9b3680b5600581f (git) Affected: 394f811848827ad23d2b43e94e5d72a24cfbc39f , < 9c33222bd387312874fbe36ca8002e5c945b9653 (git)
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)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/target/target_core_iblock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3c60a8b4037dc35e365658fcbcb349a5d742ff49",
              "status": "affected",
              "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f",
              "versionType": "git"
            },
            {
              "lessThan": "a326b19cfb7775378b50acaa8d836ba44e29b4c2",
              "status": "affected",
              "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f",
              "versionType": "git"
            },
            {
              "lessThan": "bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1",
              "status": "affected",
              "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f",
              "versionType": "git"
            },
            {
              "lessThan": "f15bcf9a99b1b2683fcfa005b9b3680b5600581f",
              "status": "affected",
              "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f",
              "versionType": "git"
            },
            {
              "lessThan": "9c33222bd387312874fbe36ca8002e5c945b9653",
              "status": "affected",
              "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/target/target_core_iblock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "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"
          },
          "scenarios": [
            {
              "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c60a8b4037dc35e365658fcbcb349a5d742ff49"
        },
        {
          "url": "https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653"
        }
      ],
      "title": "scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-MP2W-VVVM-2M46

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

Tags

Sightings

Nomenclature