CVE-2026-89852 scsi: qla2xxx: Zero mailbox struct in qla2x00_get_firmware_state()
Local attackers can read uninitialized kernel stack memory via sysfs interfaces in the qla2xxx SCSI driver, 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-2026-89852?
CVE-2026-89852 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 mailbox struct in qla2x00_get_firmware_state()
The mbx_cmd_t is allocated on the stack but left uninitialized. qla2x00_mailbox_command() has several early-return paths (PCI permanent failure, device failed, EEH busy, ISP abort pending, mailbox access timeout, purge mbox) that return without writing the input mailbox registers back into mcp->mb[]. qla2x00_get_firmware_state() then unconditionally copies mcp->mb[1..6] (and mb[12]) into the caller's states[] array regardless of the return value.
On such a failure the copied values are uninitialized kernel stack memory, which is then exposed to userspace via the fw_state and mpi_fw_state sysfs handlers. Zero the mailbox struct so a failed query yields deterministic zeroed state instead of leaking stack contents.
Which versions are affected by CVE-2026-89852?
How do I fix CVE-2026-89852?
Apply the vendor's patch.
Is CVE-2026-89852 being exploited?
There is no known exploitation of CVE-2026-89852 in the wild and no public exploit code.
Sources
Also known as AZL-101573, BELL-CVE-2026-89852, DEBIAN-CVE-2026-89852, GHSA-597j-vww4-hxxr, UBUNTU-CVE-2026-89852.