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CVE-2026-31708 (GCVE-0-2026-31708)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-08-05 12:24
VLAI
Title
smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f5778c398713692a16150ae96e5c8270bab8399f , < e66bdc0704977ecee667a81d38255b579c2353d0 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < 9e203dbb5402897c43130fb171a2617008a91f45 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < 1dd757379997b71a328a4b591ffaf481acd0ead1 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < a34d456934fe42e4da5d2cc07787bf418bee99c6 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < ac2f14e4705d020f04e806efa0d49ab8dc2b145f (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < 078fae8f50adebb903ccf2252b44391324571e78 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < 85fd46ee26a11841c670449508025965f61ce131 (git)
Affected: f5778c398713692a16150ae96e5c8270bab8399f , < a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e (git)
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Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31708.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-11T01:29:09Z",
      "cve": "CVE-2026-31708",
      "id": "CVE-2026-31708",
      "initial_release_date": "2026-05-02T01:25:22Z",
      "product_status:known_affected": "381",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31708",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31708.json",
      "version": "8"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.