CVE-2026-97486 hpfs: handle set_blocksize failures
A local attacker with mount privileges can cause a kernel crash by mounting a crafted HPFS filesystem with a large block size.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97486?
CVE-2026-97486 is a denial of service vulnerability in Linux, published on 24 Sep 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:
hpfs: handle set_blocksize failures
hpfs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting will hit the
BUG_ON(offset >= folio_size(folio));
in folio_set_bh on the first __bread_gfp call.
Which versions are affected by CVE-2026-97486?
How do I fix CVE-2026-97486?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-97486 being exploited?
There is no known exploitation of CVE-2026-97486 in the wild and no public exploit code.
Sources
Also known as AZL-103886, BELL-CVE-2026-97486, DEBIAN-CVE-2026-97486, GHSA-grhw-m2j5-c3v8, UBUNTU-CVE-2026-97486.