CVE-2026-98267 9p: Fix v9fs_issue_write() to update i_size and remote_i_size
A flaw in the Linux kernel 9p filesystem allows attackers to read stale file size data, potentially disclosing information about file contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98267?
CVE-2026-98267 is a vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
9p: Fix v9fs_issue_write() to update i_size and remote_i_size
Fix v9fs_issue_write() to update i_size and remote_i_size to the new size of the server file if we made it larger, using the start fpos and the count returned by p9_client_write() to calculate the new minimum file size.
This assumes that if the 9P server makes a short write (say it hits ENOSPC), a reduced count is returned.
Which versions are affected by CVE-2026-98267?
How do I fix CVE-2026-98267?
Apply the vendor's patch.
Is CVE-2026-98267 being exploited?
There is no known exploitation of CVE-2026-98267 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98267, DEBIAN-CVE-2026-98267, GHSA-87v5-rjqw-6p7m, UBUNTU-CVE-2026-98267.