CVE-2026-89642

In the Linux kernel, the following vulnerability has been resolved: cifs: call pagecache_isize_extended() in cifs_setsize() when extending cifs_setsize() calls truncate_pagecache() but skips pagecache_isize_extended() on extension. truncate_setsize() shows the correct pattern: i_size_write(inode, newsize); if (newsize > oldsize) pagecache_isize_extended(inode, oldsize, newsize); truncate_pagecache(inode, newsize); pagecache_isize_extended() zeroes the tail of the page straddling old EOF. Without it, dirty bytes in that region can be written back to the server, exposing stale data in the newly extended range.

• https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0
• https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8

Published

Sep 11, 2026

Last Modified

Sep 13, 2026

Status

Received

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