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A high severity vulnerability (CVE-2026-31478) in the Linux kernel's ksmbd SMB network file system component was fixed by replacing a hardcoded header length value with a correct offsetof() usage in the smb2_calc_max_out_buf_len() function. This fix addresses improper response buffer management introduced after a prior commit. The vulnerability affects multiple Linux kernel versions prior to specific 5.15.0-xxx releases for Ubuntu 20.04.1 and related OEM kernels. A patch is available and included in updated Linux kernel packages. Users should update and reboot to apply the fix.

The Linux kernel vulnerability CVE-2026-31478 concerns the ksmbd SMB network file system server daemon. After a design change to use a dynamic iov array for response buffer management, the function smb2_calc_max_out_buf_len() was incorrectly called with a hardcoded header length (hdr2_len) instead of the proper offset of the ->Buffer field in the response structure. This inconsistency was corrected by replacing the hardcoded value with the correct offsetof() macro usage in all call sites. This fix prevents potential buffer mismanagement issues in the SMB server implementation. The vulnerability affects Linux kernel versions prior to 5.15.0-1111.118~20.04.1, 5.15.0-1116.125~20.04.1, 5.15.0-1111.121~20.04.1, and 5.15.0-185.195~20.04.1. The Ubuntu security advisories USN-8490-1 and USN-8491-1 confirm the availability of patches and recommend updating to fixed kernel versions. The CVSS v3.1 score is 9.8 (critical impact on confidentiality, integrity, and availability).

Detailed information about UBUNTU-CVE-2026-31478 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31478 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()… (CVE-2026-31478)

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