CVE-2026-31478

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

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-25)

CWE

CWE-131

Published

2026-04-22

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb
• https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861
• https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d
• https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361
• https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1

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