CVE-2026-31433 Details
Description
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.
A vulnerability in the Linux kernel's ksmbd component can lead to an out-of-bounds write. This issue arises in the 'get_file_all_info()' function when processing compound requests that include 'QUERY_DIRECTORY' and 'QUERY_INFO(FILE_ALL_INFORMATION)'. If the first command uses almost the entire maximum transmission size, the function may incorrectly call 'smbConvertToUTF16()' with a path length constant, resulting in a write that exceeds the bounds of the response buffer. The problem is compounded by a lack of validation for the 'OutputBufferLength' provided by the client, which can allow filenames longer than the available buffer space to cause buffer overflows or memory corruption during the conversion process. The vulnerability has been addressed by adding proper buffer length checks and adjusting the conversion function to safely handle filenames within the allowed length.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe | kernel.org | Patch |
| https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c | kernel.org | Patch |
| https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d | kernel.org | Patch |
| https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.15.145, < 5.15.203 >= 6.1.71, < 6.1.168 >= 6.6, < 6.6.131 >= 6.7, < 6.12.80 >= 6.13, < 6.18.21 >= 6.19, < 6.19.11 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 22, 2026 | Initial Analysis | [email protected] |
| Apr 27, 2026 | CVE Modified | kernel.org |
| Apr 22, 2026 | New CVE Received | kernel.org |