by Kastro CVE-2026-31478
Linux Linux — ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
Description · from the CVE record
In the Linux kernel, the following vulnerability has been resolved: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"), response buffer management was changed to use dynamic iov array. In the new design, smb2_calc_max_out_buf_len() expects the second argument (hdr2_len) to be the offset of ->Buffer field in the response structure, not a hardcoded magic number. Fix the remaining call sites to use the correct offsetof() value.
Affected
ProductAffectedFixed inSource
Linuxf2283680a80571ca82d710bc6ecd8f8beac67d63 – < 70b4c414889492c522b6e4331562360f49be236170b4c414889492c522b6e4331562360f49be2361CNA
Linux9f297df20d93411c0b4ddad7f88ba04a7cd36e77 – < 9a7166f0ef8cbb7bb48dd05e2471d995566003f59a7166f0ef8cbb7bb48dd05e2471d995566003f5CNA
Linuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d – < c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683CNA
Linuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d – < 6aef1765d6807e0f027cd87f6ac973eb0879a46d6aef1765d6807e0f027cd87f6ac973eb0879a46dCNA
Linuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d – < 80824c7e527b70cf9039534e60aff592e8f209d180824c7e527b70cf9039534e60aff592e8f209d1CNA
Linuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d – < 4cb537ae4f37d7d0f617815ed4bed7173fb508614cb537ae4f37d7d0f617815ed4bed7173fb50861CNA
Linuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d – < 0e55f63dd08f09651d39e1b709a91705a8a0ddcb0e55f63dd08f09651d39e1b709a91705a8a0ddcbCNA
Linux5.15.145 – < 5.15.2035.15.203CNA
Linux6.1.71 – < 6.1.1686.1.168CNA
Linux6.66.1.168CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total