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CVE-2026-31708

smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.175, 6.6.136, 6.12.84, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From f5778c398713692a16150ae96e5c8270bab8399f · fixed in e66bdc0704977ecee667a81d38255b579c2353d0; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in 9e203dbb5402897c43130fb171a2617008a91f45; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in 1dd757379997b71a328a4b591ffaf481acd0ead1; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in a34d456934fe42e4da5d2cc07787bf418bee99c6; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in ac2f14e4705d020f04e806efa0d49ab8dc2b145f; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in 078fae8f50adebb903ccf2252b44391324571e78; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in 85fd46ee26a11841c670449508025965f61ce131; From f5778c398713692a16150ae96e5c8270bab8399f · fixed in a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e

  • Linux Linux

    5.1

  • KernelLinux

    From 5.1.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.84; From 6.13.0 · fixed in 6.18.25; From 6.19.0 · fixed in 7.0.2

References 8

git.kernel.org