{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80691", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.785Z", "datePublished": "2026-08-28T06:52:54.933Z", "dateUpdated": "2026-10-16T19:26:33.427Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:14.617Z" }, "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->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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/target_core_iblock.c" ], "versions": [ { "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f", "lessThan": "3c60a8b4037dc35e365658fcbcb349a5d742ff49", "status": "affected", "versionType": "git" }, { "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f", "lessThan": "a326b19cfb7775378b50acaa8d836ba44e29b4c2", "status": "affected", "versionType": "git" }, { "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f", "lessThan": "bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1", "status": "affected", "versionType": "git" }, { "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f", "lessThan": "f15bcf9a99b1b2683fcfa005b9b3680b5600581f", "status": "affected", "versionType": "git" }, { "version": "394f811848827ad23d2b43e94e5d72a24cfbc39f", "lessThan": "9c33222bd387312874fbe36ca8002e5c945b9653", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/target_core_iblock.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80691", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:20:02.512746Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:33.427Z" } } ] } }