Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

• git.kernel.org/stable/c/3df27277f8f95345d4a6c57367824bf1aefdbf66
• git.kernel.org/stable/c/6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d
• git.kernel.org/stable/c/94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183
• git.kernel.org/stable/c/b75dadb50a25eed525264bf6fea44fad94e7626f
• git.kernel.org/stable/c/da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0