CVE-2026-93828 exfat: fix handling of damaged volume in exfat_create_upcase_table()
An integer overflow in the Linux kernel exFAT driver causes an infinite loop when processing a damaged volume with a zero-sized upcase table.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-93828?
CVE-2026-93828 is a vulnerability in Linux, published on 24 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
exfat: fix handling of damaged volume in exfat_create_upcase_table()
When the size of the upcase table is set to zero in the dentry for any reason(e.g. corrupted media or misbehaving device), an integer overflow causes the module to loop indefinitely.
If the size of the upcase table is read zero, do not attempt to load the table. Instead, fallback to loading the default upcase table. If the size of the upcase table is zero or no upcase table is found, raise exfat_fs_error() to mark the volume read-only.
Which versions are affected by CVE-2026-93828?
How do I fix CVE-2026-93828?
Apply the vendor's patch.
Is CVE-2026-93828 being exploited?
There is no known exploitation of CVE-2026-93828 in the wild and no public exploit code.
Sources
Also known as AZL-103604, BELL-CVE-2026-93828, DEBIAN-CVE-2026-93828, GHSA-crx7-9vj2-jqgc, UBUNTU-CVE-2026-93828.