# CVE-2026-31478

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31478
- **Published:** 2026-04-22
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** NVD-CWE-noinfo

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31478

## Citation

> AI Analytics. CVE-2026-31478. Retrieved 2026-07-24 from https://api.ai-analytics.org/cve/CVE-2026-31478. Derived from NIST NVD. Licensed CC0.

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