CVE-2026-89858 scsi: qla2xxx: Bound image count in qla2x00_update_fru_versions()
A local attacker can trigger an out-of-bounds read in the qla2xxx SCSI driver to leak kernel stack memory to the device.
- 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-2026-89858?
CVE-2026-89858 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: Bound image count in qla2x00_update_fru_versions()
qla2x00_update_fru_versions() copies the user-supplied BSG request into a fixed 256-byte stack buffer (bsg[DMA_POOL_SIZE]) and then iterates list->count times over the qla_image_version array embedded in that buffer, advancing the image pointer each iteration. count is taken directly from user input with no upper bound, while only (DMA_POOL_SIZE - sizeof(list->count)) / sizeof(struct qla_image_version) = 6 entries actually fit. A larger count walks the image pointer off the end of the stack buffer, reading adjacent kernel stack memory and sending it to the device via qla2x00_write_sfp().
Reject requests whose declared count does not fit in the buffer.
Which versions are affected by CVE-2026-89858?
How do I fix CVE-2026-89858?
Apply the vendor's patch.
Is CVE-2026-89858 being exploited?
There is no known exploitation of CVE-2026-89858 in the wild and no public exploit code.
Sources
Also known as AZL-101634, BELL-CVE-2026-89858, DEBIAN-CVE-2026-89858, GHSA-m82c-43pj-6cj6, UBUNTU-CVE-2026-89858.