CVE-2026-31464

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This value is\nstored directly in vhost->num_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation. The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - Reachable through IBM Power VIO virtual Fibre Channel CRQ/MAD responses from the backing VIO server on the same virtual I/O fabric, not through a local syscall or routable network path.\nAC:L - A malicious or compromised VIO server directly controls the `num_written` value in the Discover Targets response; no race or hard-to-control condition is required once the adapter is initialized.\nPR:N - No privilege or authentication check in the Linux guest gates this completion path; the crafted response is accepted from the configured VIO partner.\nUI:N - The vulnerable discovery flow runs during adapter initialization/reinitialization and processes the VIO server response without requiring any end-user action.\nS:U - The impact is on the guest Linux kernel/driver resources that process the malicious virtual device response; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The excessive `num_written` causes out-of-bounds reads beyond the discovery buffer, and the derived values are sent back to the VIO server in Implicit Logout/PLOGI MADs, leaking kernel memory.\nI:N - The investigated bug is an out-of-bounds read used to construct outbound MAD fields; I did not find an out-of-bounds write or arbitrary kernel memory modification primitive.\nA:H - The server-controlled oversized count can drive reads far beyond the DMA-coherent allocation and create excessive target-processing work, making kernel oops, hang, or resource exhaustion plausible."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "2.6.27", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc"}, {"url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89"}, {"url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161"}, {"url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780"}, {"url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983"}, {"url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db"}, {"url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f"}], "title": "scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31464", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:09:42.415310Z"}}}], "problemTypes": 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This value is\nstored directly in vhost->num_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation. The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - Reachable through IBM Power VIO virtual Fibre Channel CRQ/MAD responses from the backing VIO server on the same virtual I/O fabric, not through a local syscall or routable network path.\nAC:L - A malicious or compromised VIO server directly controls the `num_written` value in the Discover Targets response; no race or hard-to-control condition is required once the adapter is initialized.\nPR:N - No privilege or authentication check in the Linux guest gates this completion path; the crafted response is accepted from the configured VIO partner.\nUI:N - The vulnerable discovery flow runs during adapter initialization/reinitialization and processes the VIO server response without requiring any end-user action.\nS:U - The impact is on the guest Linux kernel/driver resources that process the malicious virtual device response; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The excessive `num_written` causes out-of-bounds reads beyond the discovery buffer, and the derived values are sent back to the VIO server in Implicit Logout/PLOGI MADs, leaking kernel memory.\nI:N - The investigated bug is an out-of-bounds read used to construct outbound MAD fields; I did not find an out-of-bounds write or arbitrary kernel memory modification primitive.\nA:H - The server-controlled oversized count can drive reads far beyond the DMA-coherent allocation and create excessive target-processing work, making kernel oops, hang, or resource exhaustion plausible."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()\n\nA malicious or compromised VIO server can return a num_written value in the\ndiscover targets MAD response that exceeds max_targets. This value is\nstored directly in vhost->num_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation. The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: ibmvfc: Correcci\u00f3n de acceso fuera de l\u00edmites en ibmvfc_discover_targets_done()\n\nUn servidor VIO malicioso o comprometido puede devolver un valor num_written en la respuesta MAD de descubrimiento de objetivos que excede max_targets. Este valor se almacena directamente en vhost -> num_targets sin validaci\u00f3n, y luego se utiliza como l\u00edmite de bucle en ibmvfc_alloc_targets() para indexar en disc_buf[], que solo se asigna para entradas max_targets. Los \u00edndices en o m\u00e1s all\u00e1 de max_targets acceden a memoria del kernel fuera de la asignaci\u00f3n coherente con DMA. Los datos fuera de l\u00edmites se incrustan posteriormente en MADs de Implicit Logout y PLOGI que se env\u00edan de vuelta al servidor VIO, filtrando memoria del kernel.\n\nCorrecci\u00f3n mediante la limitaci\u00f3n de num_written a max_targets antes de almacenarlo."}], "id": "CVE-2026-31464", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31464", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:42.415310Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:42.450", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()", "id": "2460715", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460715"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's scsi: ibmvfc driver. A malicious or compromised Virtual I/O (VIO) server can exploit this by sending a crafted response during target discovery. This response can cause an out-of-bounds memory access, leading to the disclosure of sensitive kernel memory."], "name": "CVE-2026-31464", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31464\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31464\nhttps://lore.kernel.org/linux-cve-announce/2026042252-CVE-2026-31464-f9c5@gregkh/T"], "threat_severity": "Moderate"}

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