CVE-2026-31478

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-31478

Key Details

CVE	CVE-2026-31478
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31478
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31478

Source

Reference

NVD

CVE