What is CVE-2026-31478?

CVE-2026-31478 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-04-22.

How severe is CVE-2026-31478?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Linux

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…

EPSS: 0.001 (26.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 5.15.203, f2283680a80571ca82d710bc6ecd8f8beac67d63, 6.18.21
Linux Linux_kernel — versions 6.6, 7.0

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-31478?: CVE-2026-31478 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-04-22.
How severe is CVE-2026-31478?: Critical severity. CVSS v3 base score is 9.8 out of 10.