CVE-2026-31433ksmbd: fix potencial OOB in get_file_all_info() for compound requests
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f2283680a80571ca82d710bc6ecd8f8beac67d63 before 3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7; 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 builds before 4cca3eff2099b18672934a39cee70aed835d652c; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 7aec5a769d2356cbf344d85bcfd36de592ac96a5; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before b0cd9725fe2bcc9f37d096b132318a9060373f5d; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 9d7032851d6f5adbe2739601ca456c0ad3b422f0; from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before beef2634f81f1c086208191f7228bce1d366493d; from 5.15.145 before 5.15.203; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15.145 before 5.15.203; from 6.1.71 before 6.1.168; from 6.6 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; 7.0; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7patch
- https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652cpatch
- https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fepatch
- https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5patch
- https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5dpatch
- https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0patch
- https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493dpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.