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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-31432

ksmbd: fix OOB write in QUERY_INFO for compound requests

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix OOB write in QUERY_INFO for compound requests When a compound request such as READ + QUERY_INFO(Security) is received, and the first command (READ) consumes most of the response buffer, ksmbd could write beyond the allocated buffer while building a security descriptor. The root cause was that smb2_get_info_sec() checked buffer space using ppntsd_size from xattr, while build_sec_desc() often synthesized a significantly larger descriptor from POSIX ACLs. This patch introduces smb_acl_sec_desc_scratch_len() to accurately compute the final descriptor size beforehand, performs proper buffer checking with smb2_calc_max_out_buf_len(), and uses exact-sized allocation + iov pinning.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to < 850452af77f55d185f9445e1f7a1db53c5e4aad4affected
  • e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to < d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09affected
  • e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to < 075ea208c648cc2bcd616295b711d3637c61de45affected
  • e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to < 515c2daab46021221bdf406bef19bc90a44ec617affected
  • e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to < fda9522ed6afaec45cabc198d8492270c394c7bcaffected
  • f2283680a80571ca82d710bc6ecd8f8beac67d63affected
  • 9f297df20d93411c0b4ddad7f88ba04a7cd36e77affected
  • 5.15.145 to < 5.16affected
  • 6.1.71 to < 6.2affected

Linux Linux

Default version status: affected

  • 6.6affected
  • 0 to < 6.6unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.81 to ≤ 6.12.*unaffected
  • 6.18.22 to ≤ 6.18.*unaffected
  • 6.19.12 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References