CVE-2026-72310

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The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - Exploitation requires processing a crafted SMB2 IOCTL response from a malicious SMB/CIFS server over TCP; the bug is in client-side parsing of attacker-controlled network protocol fields, not in a purely local code path.\nAC:L - A malicious server can reliably supply OutputOffset and OutputCount values that wrap the 32-bit bounds check and pass validation, deterministically triggering the out-of-bounds copy_to_user() without races or special victim state.\nPR:L - The PASSTHRU_FSCTL ioctl path requires CAP_SYS_ADMIN, which an unprivileged local user can obtain inside a user namespace and use to mount CIFS and issue CIFS_QUERY_INFO against an attacker-controlled server.\nUI:N - In the highest-impact scenario the attacker controls the full chain (user-namespace mount plus ioctl) and needs no separate victim action beyond their own exploitation steps.\nS:U - Impact is disclosure of kernel heap memory to the calling userspace process within the same kernel security authority; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - The integer overflow bypasses bounds checking so copy_to_user() reads qi.input_buffer_length bytes from io_rsp plus attacker-chosen OutputOffset outside the SMB response buffer, leaking adjacent kernel memory to userspace.\nI:N - The flaw is an out-of-bounds kernel read copied to userspace; it does not modify kernel memory, corrupt metadata, or provide a write or code-execution primitive.\nA:H - Reading far outside the allocated SMB response buffer can access unmapped kernel pages during copy_to_user(), causing a kernel fault, oops, or panic in addition to information disclosure."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa", "status": "affected", "versionType": "git"}, {"version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f", "status": "affected", "versionType": "git"}, {"version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974", "status": "affected", "versionType": "git"}, {"version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "160045fc943f6c46b227644261252c8a22b8a87a", "status": "affected", "versionType": "git"}, {"version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670", "status": 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overflow in passthrough ioctl bounds check", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72310", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:46:23.070703Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:16.690Z"}}]}}

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it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - The integer overflow bypasses bounds checking so copy_to_user() reads qi.input_buffer_length bytes from io_rsp plus attacker-chosen OutputOffset outside the SMB response buffer, leaking adjacent kernel memory to userspace.\nI:N - The flaw is an out-of-bounds kernel read copied to userspace; it does not modify kernel memory, corrupt metadata, or provide a write or code-execution primitive.\nA:H - Reading far outside the allocated SMB response buffer can access unmapped kernel pages during copy_to_user(), causing a kernel fault, oops, or panic in addition to information disclosure."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "160045fc943f6c46b227644261252c8a22b8a87a", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "1627e7d5c9b09721a141d07cedb178882f1ded67", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9", "versionType": "git"}, {"status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "lessThan": "a4f27ad055392fa164f5649e89a3637b033c5fcc", "versionType": "git"}, {"status": "affected", "version": "2005c32ec99ee2490e8131b3953f3f212009ffea", "versionType": "git"}, {"status": "affected", "version": "5.4.69", "lessThan": "5.5", "versionType": "semver"}], "programFiles": ["fs/smb/client/smb2ops.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/smb2ops.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"}, {"url": "https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"}, {"url": "https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"}, {"url": "https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"}, {"url": "https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"}, {"url": "https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"}, {"url": "https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"}, {"url": "https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.69"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:42:38.636Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72310", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:16.690Z", "dateReserved": "2026-08-09T03:40:39.918Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:55:26.539Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/smb2ops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "160045fc943f6c46b227644261252c8a22b8a87a", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "1627e7d5c9b09721a141d07cedb178882f1ded67", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"lessThan": "a4f27ad055392fa164f5649e89a3637b033c5fcc", "status": "affected", "version": "2b1116bbe898aefdf584838448c6869f69851e0f", "versionType": "git"}, {"status": "affected", "version": "2005c32ec99ee2490e8131b3953f3f212009ffea", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.69", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/smb2ops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "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\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds."}], "id": "CVE-2026-72310", "lastModified": "2026-10-16T19:17:21.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/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-2026-72310", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:46:23.070703Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:03.777", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: smb: client: fix overflow in passthrough ioctl bounds check", "id": "2516233", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516233"}, "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-125", "details": ["A flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious SMB server could exploit an integer overflow vulnerability in the `smb2_ioctl_query_info()` function's bounds check. By sending a specially crafted response with a large offset, the server can cause the client to read data beyond the allocated buffer. This out-of-bounds read could lead to information disclosure from the kernel memory."], "name": "CVE-2026-72310", "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": "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": "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72310\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72310\nhttps://lore.kernel.org/linux-cve-announce/2026081504-CVE-2026-72310-7e47@gregkh/T"], "threat_severity": "Moderate"}

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