CVE-2026-90080 octeontx2-pf: fix NULL deref of af_xdp_zc_qidx on rep setup
A local attacker with high privileges can cause a kernel crash by triggering a NULL pointer dereference in the octeontx2-pf driver during representor setup.
- 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-2026-90080?
CVE-2026-90080 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-pf: fix NULL deref of af_xdp_zc_qidx on rep setup
af_xdp_zc_qidx tracks receive queues using AF_XDP zero-copy and is allocated during PF/VF probe. Representors and other non-AF_XDP paths leave the pointer NULL, but several call sites used test_bit() on it unconditionally.
Switching to devlink eswitch mode creates representors and runs otx2_init_hw_resources(), which reaches otx2_pool_aq_init() and oopses when dereferencing the NULL bitmap. Add NULL checks before every af_xdp_zc_qidx test_bit() use in the RSS, ethtool, XSK, and pool init paths.
Which versions are affected by CVE-2026-90080?
How do I fix CVE-2026-90080?
Apply the vendor's patch.
Is CVE-2026-90080 being exploited?
There is no known exploitation of CVE-2026-90080 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90080, DEBIAN-CVE-2026-90080, GHSA-5wx6-43ww-fw3m, UBUNTU-CVE-2026-90080.