ksmbd: fix potencial OOB in get_file_all_info() for compound requests

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Summary

CVECVE-2026-31433
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 09:16:21 UTC
Updated2026-04-27 14:16:38 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000430000 probability, percentile 0.133430000 (date 2026-05-28)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f2283680a80571ca82d710bc6ecd8f8beac67d63 3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 git Not specified
CNA Linux Linux affected 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 4cca3eff2099b18672934a39cee70aed835d652c git Not specified
CNA Linux Linux affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe git Not specified
CNA Linux Linux affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 7aec5a769d2356cbf344d85bcfd36de592ac96a5 git Not specified
CNA Linux Linux affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d b0cd9725fe2bcc9f37d096b132318a9060373f5d git Not specified
CNA Linux Linux affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 9d7032851d6f5adbe2739601ca456c0ad3b422f0 git Not specified
CNA Linux Linux affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d beef2634f81f1c086208191f7228bce1d366493d git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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