CVE-2026-90085 octeontx2-af: fix NULL deref in NIX TM tree debugfs read path
A local attacker with debugfs access can trigger a kernel crash by reading a specific file when transmit queues are uninitialized.
- 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-2026-90085?
CVE-2026-90085 is a vulnerability in Linux, published on 17 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:
octeontx2-af: fix NULL deref in NIX TM tree debugfs read path
rvu_dbg_nix_tm_tree_display() dereferences pfvf->sq_ctx without checking whether the SQ context has been allocated. Reading /sys/kernel/debug/octeontx2/nix/tm_tree for a NIX LF whose transmit queues are not set up triggers a kernel oops.
Guard the read path the same way rvu_dbg_nix_tm_tree_write() already does and return -EINVAL with a seq_file message when sq_ctx is NULL.
Which versions are affected by CVE-2026-90085?
How do I fix CVE-2026-90085?
Apply the vendor's patch.
Is CVE-2026-90085 being exploited?
There is no known exploitation of CVE-2026-90085 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90085, DEBIAN-CVE-2026-90085, GHSA-m9hw-68r8-5833, UBUNTU-CVE-2026-90085.