{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72018", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.900Z", "datePublished": "2026-08-15T05:51:45.360Z", "dateUpdated": "2026-08-17T05:39:27.125Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:39:27.125Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndibs: loopback: validate offset and size in move_data()\n\nThe loopback move_data() performs a memcpy into the registered DMB\nwithout checking whether offset + size exceeds the DMB length. Unlike\nreal ISM hardware, which enforces memory region bounds natively, the\nsoftware loopback has no such protection.\n\nA peer-supplied out-of-bounds offset or oversized write would result in\nan OOB write past the allocated kernel buffer. Add an explicit bounds\ncheck before the memcpy to reject such requests with -EINVAL."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is only reachable via loopback-ISM (intra-OS DIBS), which requires matching local GID and shared kernel; exploitation is through AF_SMC sendmsg after SMC-D handshake, not remote packet handling on a network-facing stack path.\nAC:L - A malicious SMC-D peer can supply crafted CLC dmbe_idx/dmbe_size values and send patterns that drive move_data() with attacker-controlled offset and size; no race or uncontrollable memory layout is required once loopback-ISM is active.\nPR:L - Exploitation requires only an unprivileged local account able to open AF_SMC sockets and complete an SMC-D loopback handshake (no CAP_NET_ADMIN or root); the SMC CLC path performs no authentication beyond standard socket access controls.\nUI:N - No victim user action is needed when a malicious peer initiates an inbound SMC-D connection to a listening service; the attacker can trigger the OOB write by sending SMC-D data after handshake completion.\nS:U - The OOB write corrupts kernel heap memory within the same kernel security authority; successful exploitation yields local privilege escalation, not cross-VM, container-boundary, or IOMMU bypass scope change.\nC:H - An out-of-bounds kernel heap write past the folio-allocated DMB buffer can corrupt adjacent kernel objects and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak or pure crash.\nI:H - The unchecked memcpy() allows controlled out-of-bounds writes beyond the registered DMB allocation, enabling heap corruption and potential arbitrary kernel code execution or control-flow hijacking.\nA:H - Writing past the allocated DMB folio can immediately corrupt critical kernel structures and cause kernel oops, panic, or hang; heap corruption from the OOB write itself constitutes high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dibs/dibs_loopback.c"], "versions": [{"version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "lessThan": "ee188a6b264b71315a67f1b9470faad308b730d2", "status": "affected", "versionType": "git"}, {"version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "lessThan": "b2f426a9a22886071966432ede8fceafffe12b8c", "status": "affected", "versionType": "git"}, {"version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "lessThan": "94fe0ab01b480b52bd8f977edbd845ef375d69fd", "status": "affected", "versionType": "git"}, {"version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "lessThan": "78237e3c0720fcc6eb9b87e90fd70f63eeca886f", "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_loopback.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "6.10", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2"}, {"url": "https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c"}, {"url": "https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd"}, {"url": "https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f"}], "title": "dibs: loopback: validate offset and size in move_data()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/dibs/dibs_loopback.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ee188a6b264b71315a67f1b9470faad308b730d2", "status": "affected", "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "versionType": "git"}, {"lessThan": "b2f426a9a22886071966432ede8fceafffe12b8c", "status": "affected", "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "versionType": "git"}, {"lessThan": "94fe0ab01b480b52bd8f977edbd845ef375d69fd", "status": "affected", "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "versionType": "git"}, {"lessThan": "78237e3c0720fcc6eb9b87e90fd70f63eeca886f", "status": "affected", "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/dibs/dibs_loopback.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndibs: loopback: validate offset and size in move_data()\n\nThe loopback move_data() performs a memcpy into the registered DMB\nwithout checking whether offset + size exceeds the DMB length. Unlike\nreal ISM hardware, which enforces memory region bounds natively, the\nsoftware loopback has no such protection.\n\nA peer-supplied out-of-bounds offset or oversized write would result in\nan OOB write past the allocated kernel buffer. Add an explicit bounds\ncheck before the memcpy to reject such requests with -EINVAL."}], "id": "CVE-2026-72018", "lastModified": "2026-08-17T06:17:59.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:00.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: dibs: loopback: validate offset and size in move_data()", "id": "2516386", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516386"}, "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-787", "details": ["A flaw was found in the Linux kernel's dibs: loopback functionality. A missing bounds check in the move_data() function allows an attacker to provide an out-of-bounds offset or an oversized write. This can lead to an out-of-bounds write past an allocated kernel buffer, potentially causing memory corruption and a denial of service or arbitrary code execution."], "name": "CVE-2026-72018", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72018\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72018\nhttps://lore.kernel.org/linux-cve-announce/2026081509-CVE-2026-72018-ba3f@gregkh/T"], "threat_severity": "Moderate"}