{"api_version":"1","generated_at":"2026-08-29T12:12:57+00:00","cve":"CVE-2026-80691","urls":{"html":"https://cve.report/CVE-2026-80691","api":"https://cve.report/api/cve/CVE-2026-80691.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80691","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80691"},"summary":{"title":"scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE","description":"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->pr_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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:54","updated_at":"2026-08-29 07:16:51"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/3c60a8b4037dc35e365658fcbcb349a5d742ff49","name":"https://git.kernel.org/stable/c/3c60a8b4037dc35e365658fcbcb349a5d742ff49","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2","name":"https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f","name":"https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1","name":"https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653","name":"https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80691","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80691","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 394f811848827ad23d2b43e94e5d72a24cfbc39f 3c60a8b4037dc35e365658fcbcb349a5d742ff49 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 394f811848827ad23d2b43e94e5d72a24cfbc39f a326b19cfb7775378b50acaa8d836ba44e29b4c2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 394f811848827ad23d2b43e94e5d72a24cfbc39f bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 394f811848827ad23d2b43e94e5d72a24cfbc39f f15bcf9a99b1b2683fcfa005b9b3680b5600581f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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->pr_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's single security authority.\nC:N - The failure is a direct NULL function-pointer call (ops->pr_preempt or ops->pr_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"},"nvd":{"publishedDate":"2026-08-28 08:16:54","lastModifiedDate":"2026-08-29 07:16:51","problem_types":[],"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:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80691","Ordinal":"1","Title":"scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RE","CVE":"CVE-2026-80691","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80691","Ordinal":"1","NoteData":"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->pr_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.","Type":"Description","Title":"scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RE"}]}}}