CVE-2026-31478critical

CVE-2026-31478: critical vulnerability in Linux

ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()

Published · Updated

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.7%
exploitation probability
0.7%top 47% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcbhttps://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46dhttps://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683