{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74617", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.920Z", "datePublished": "2026-08-22T15:32:02.049Z", "dateUpdated": "2026-10-16T19:06:02.395Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:44.661Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndibs: initialise dibs->lock in dibs_dev_alloc()\n\ndibs->lock is initialised by dibs_dev_add(), but a dibs device can\nalready take interrupts before that call: ism_probe() runs\nism_dev_init(), and hence request_irq(), before it calls\ndibs_dev_add(). No client can have registered a dmb at that point, so\nno dmb interrupt can occur, but a GID event interrupt can, and\nism_handle_irq() takes dibs->lock unconditionally on entry, before it\ninspects anything else.\n\nInitialise the lock in dibs_dev_alloc() instead, so that it is valid as\nsoon as a driver can publish the device to its interrupt handler." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:N - On IBM Z SMC-D systems, a remote networked peer on the shared ISM fabric can emit GID/IEQ fabric events that raise ISM MSI interrupts during ism_probe, reaching ism_handle_irq() without any local syscall or ioctl on the victim.\nAC:L - The attacker controls timing by repeatedly sending ISM GID/IEQ fabric events (or coordinating with victim reboot/module reprobe) to hit the probe window between request_irq() and dibs_dev_add(), rather than depending on uncontrollable memory layout.\nPR:N - Exploitation is driven by ISM hardware interrupts from fabric events and does not require local credentials, capabilities, or namespaces on the victim; a remote/co-tenant ISM fabric peer can trigger the IRQ path during device bring-up.\nUI:N - The race occurs automatically during kernel boot or ISM driver probe when fabric GID events arrive; no victim user action such as mounting a filesystem or opening a device node is required.\nS:U - The flaw corrupts kernel driver state via an uninitialized spinlock in IRQ context but does not cross a VM, IOMMU, or sandbox security boundary; impact remains within kernel privilege.\nC:H - Calling spin_lock() on an uninitialized dibs->lock is undefined behavior that can corrupt lock metadata and adjacent dibs_dev fields, creating a memory-safety primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Broken spinlock initialization can permit unsafe concurrent access to dibs_dev state and enable arbitrary kernel memory writes or control-flow hijacking, not merely a clean denial of service.\nA:H - Taking an uninitialized spinlock in ism_handle_irq() can trigger kernel BUG/oops/panic or wedge ISM interrupt handling, causing a high-severity system crash or hang on affected IBM Z hosts." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dibs/dibs_main.c", "include/linux/dibs.h" ], "versions": [ { "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "fe79571f40434b257d68cbfb7b3ae93a794d8a11", "status": "affected", "versionType": "git" }, { "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "2926031acba100d0c18fcfaa7a2ed29609318848", "status": "affected", "versionType": "git" }, { "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "c27e360545373b7aee9862a5beef3b9fb3df0c25", "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/dibs/dibs_main.c", "include/linux/dibs.h" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "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": "6.18", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fe79571f40434b257d68cbfb7b3ae93a794d8a11" }, { "url": "https://git.kernel.org/stable/c/2926031acba100d0c18fcfaa7a2ed29609318848" }, { "url": "https://git.kernel.org/stable/c/c27e360545373b7aee9862a5beef3b9fb3df0c25" } ], "title": "dibs: initialise dibs->lock in dibs_dev_alloc()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74617", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:02:36.634997Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:02.395Z" } } ] } }