mm: filemap: fix nr_pages calculation overflow in filemap_map_pages()

Scope

What the vendor says is affected

• azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
• azl3 kernel 6.6.134.1-2 on Azure Linux 3.0

Timeline

When this advisory changed

1. Apr 29, 2026 at 1:06 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-31648View CVSS, KEV, EPSS, and threat context