CVE-2026-31433 (GCVE-0-2026-31433)

Vulnerability from cvelistv5 – Published: 2026-04-22 08:15 – Updated: 2026-05-23 16:05
VLAI
Title
ksmbd: fix potencial OOB in get_file_all_info() for compound requests
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix potencial OOB in get_file_all_info() for compound requests When a compound request consists of QUERY_DIRECTORY + QUERY_INFO (FILE_ALL_INFORMATION) and the first command consumes nearly the entire max_trans_size, get_file_all_info() would blindly call smbConvertToUTF16() with PATH_MAX, causing out-of-bounds write beyond the response buffer. In get_file_all_info(), there was a missing validation check for the client-provided OutputBufferLength before copying the filename into FileName field of the smb2_file_all_info structure. If the filename length exceeds the available buffer space, it could lead to potential buffer overflows or memory corruption during smbConvertToUTF16 conversion. This calculating the actual free buffer size using smb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is insufficient and updating smbConvertToUTF16 to use the actual filename length (clamped by PATH_MAX) to ensure a safe copy operation.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f2283680a80571ca82d710bc6ecd8f8beac67d63 , < 3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 (git)
Affected: 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 , < 4cca3eff2099b18672934a39cee70aed835d652c (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 7aec5a769d2356cbf344d85bcfd36de592ac96a5 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < b0cd9725fe2bcc9f37d096b132318a9060373f5d (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 9d7032851d6f5adbe2739601ca456c0ad3b422f0 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < beef2634f81f1c086208191f7228bce1d366493d (git)
Affected: 5.15.145 , < 5.15.203 (semver)
Affected: 6.1.71 , < 6.1.168 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:59:07+00:00",
      "cve": "CVE-2026-31433",
      "id": "CVE-2026-31433",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix potencial OOB in get_file_all_info() for compound requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31433.json",
      "version": "3"
    }
  }
}



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  • 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.