CVE-2026-89859 scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak
A local attacker can read uninitialized kernel heap memory via the qla2xxx SCSI driver diagnostics interface, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89859?
CVE-2026-89859 is a vulnerability in Linux, published on 16 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:
scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak
qla2x00_do_dport_diagnostics() allocates the qla_dport_diag response buffer with kmalloc_obj() (non-zeroing) and, on success, copies the full sizeof(*dd) back to user space via sg_copy_from_buffer(). The inbound sg_copy_to_buffer() only fills as many bytes as the user request payload provides, and qla26xx_dport_diagnostics() zeroes only dd->buf. The options and unused[] fields are therefore copied out uninitialized, leaking kernel heap contents to user space.
Allocate with kzalloc_obj(), matching qla2x00_do_dport_diagnostics_v2().
Which versions are affected by CVE-2026-89859?
How do I fix CVE-2026-89859?
Apply the vendor's patch.
Is CVE-2026-89859 being exploited?
There is no known exploitation of CVE-2026-89859 in the wild and no public exploit code.
Sources
Also known as AZL-101171, BELL-CVE-2026-89859, DEBIAN-CVE-2026-89859, GHSA-77jx-g549-23wh, UBUNTU-CVE-2026-89859.