CVE-2026-31478

CriticalCVSS 9.8/10Last modified Nov 11, 2026

Description

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-131

Affected software

VendorProductVersions
LinuxLinux>= f2283680a80571ca82d710bc6ecd8f8beac67d63, < 70b4c414889492c522b6e4331562360f49be2361; >= 9f297df20d93411c0b4ddad7f88ba04a7cd36e77, < 9a7166f0ef8cbb7bb48dd05e2471d995566003f5; >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d, < c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683; >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d, < 6aef1765d6807e0f027cd87f6ac973eb0879a46d; >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d, < 80824c7e527b70cf9039534e60aff592e8f209d1; >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d, < 4cb537ae4f37d7d0f617815ed4bed7173fb50861; >= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d, < 0e55f63dd08f09651d39e1b709a91705a8a0ddcb; >= 5.15.145, < 5.15.203; >= 6.1.71, < 6.1.168
LinuxLinux6.6

References

Timeline

Published
Apr 22, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-31478: Critical severity, CVSS 9.8 | Vulnix