CVE-2026-31708 (GCVE-0-2026-31708)
Vulnerability from cvelistv5
Published
2026-05-01 13:56
Modified
2026-10-19 19:06
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds.
References
Impacted products
Vendor Product Version
Linux Linux Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
Version: f5778c398713692a16150ae96e5c8270bab8399f
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That can trigger kernel faults or hardened usercopy failures, so a kernel crash is a defensible impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"e66bdc0704977ecee667a81d38255b579c2353d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"9e203dbb5402897c43130fb171a2617008a91f45\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"1dd757379997b71a328a4b591ffaf481acd0ead1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"a34d456934fe42e4da5d2cc07787bf418bee99c6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"ac2f14e4705d020f04e806efa0d49ab8dc2b145f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"078fae8f50adebb903ccf2252b44391324571e78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"85fd46ee26a11841c670449508025965f61ce131\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5778c398713692a16150ae96e5c8270bab8399f\", \"lessThan\": \"a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e\", \"versionType\": \"git\"}], \"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\": \"5.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.259\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.136\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.25\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/client/smb2ops.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e66bdc0704977ecee667a81d38255b579c2353d0\"}, {\"url\": \"https://git.kernel.org/stable/c/9e203dbb5402897c43130fb171a2617008a91f45\"}, {\"url\": \"https://git.kernel.org/stable/c/1dd757379997b71a328a4b591ffaf481acd0ead1\"}, {\"url\": \"https://git.kernel.org/stable/c/a34d456934fe42e4da5d2cc07787bf418bee99c6\"}, {\"url\": \"https://git.kernel.org/stable/c/ac2f14e4705d020f04e806efa0d49ab8dc2b145f\"}, {\"url\": \"https://git.kernel.org/stable/c/078fae8f50adebb903ccf2252b44391324571e78\"}, {\"url\": \"https://git.kernel.org/stable/c/85fd46ee26a11841c670449508025965f61ce131\"}, {\"url\": \"https://git.kernel.org/stable/c/a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e\"}], \"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 OOB read in smb2_ioctl_query_info QUERY_INFO path\\n\\nsmb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL\\nand the default QUERY_INFO path.  The QUERY_INFO branch clamps\\nqi.input_buffer_length to the server-reported OutputBufferLength and then\\ncopies qi.input_buffer_length bytes from qi_rsp-\u003eBuffer to userspace, but\\nit never verifies that the flexible-array payload actually fits within\\nrsp_iov[1].iov_len.\\n\\nA malicious server can return OutputBufferLength larger than the actual\\nQUERY_INFO response, causing copy_to_user() to walk past the response\\nbuffer and expose adjacent kernel heap to userspace.\\n\\nGuard the QUERY_INFO copy with a bounds check on the actual Buffer\\npayload.  Use struct_size(qi_rsp, Buffer, qi.input_buffer_length)\\nrather than an open-coded addition so the guard cannot overflow on\\n32-bit builds.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.136\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.84\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.25\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.2\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:24:43.143Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31708\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:06:06.825Z\", \"dateReserved\": \"2026-03-09T15:48:24.132Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-01T13:56:05.880Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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