Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 850452af77f55d185f9445e1f7a1db53c5e4aad4; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 075ea208c648cc2bcd616295b711d3637c61de45; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 515c2daab46021221bdf406bef19bc90a44ec617; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before fda9522ed6afaec45cabc198d8492270c394c7bc; affected f2283680a80571ca82d710bc6ecd8f8beac67d63; affected 9f297df20d93411c0b4ddad7f88ba04a7cd36e77; affected 5.15.145 before 5.16; affected 6.1.71 before 6.2 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.6.143 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/850452af77f55d185f9445e1f7a1db53c5e4aad4
- https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09
- https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45
- https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617
- https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc