CVE-2026-90080: octeontx2-pf: fix NULL deref of af_xdp_zc_qidx on rep setup

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-17 · updated 2026-10-19

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.

Affected products

Linux kernel: from 6.14.9 before 6.15; 6.15 — fixed in 6.15, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.15, 7.3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-90080 or the next vulnerability affects your stack