CVE-2026-89853 scsi: qla2xxx: Fix FCE trace use-after-free during firmware dump
A use-after-free in the qla2xxx SCSI driver allows local attackers with high privileges to execute arbitrary code or escalate privileges during firmware dumps.
- 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-2026-89853?
CVE-2026-89853 is an use after free 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: Fix FCE trace use-after-free during firmware dump
qla2x00_free_fce_trace() freed and cleared ha->fce while holding only fce_mutex. The firmware-dump consumers qla27xx_fwdt_entry_t264() and qla25xx_copy_fce() read ha->fce (NULL check followed by a copy of the buffer) under hardware_lock and never take fce_mutex. A debugfs FCE disable could therefore free the DMA buffer between a dump's NULL check and its copy, resulting in a use-after-free.
Unpublish ha->fce under hardware_lock, then release the lock and free the DMA buffer (dma_free_coherent() may sleep). A concurrent dump either completes its check and copy with the buffer still valid, or observes ha->fce == NULL and skips it.
Which versions are affected by CVE-2026-89853?
How do I fix CVE-2026-89853?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89853 being exploited?
There is no known exploitation of CVE-2026-89853 in the wild and no public exploit code.
Sources
Also known as AZL-101142, BELL-CVE-2026-89853, DEBIAN-CVE-2026-89853, GHSA-3hhp-7j3w-92c8, UBUNTU-CVE-2026-89853.