CVE-2026-90080

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.

• https://git.kernel.org/stable/c/7e33c6bd049b532d2ec4916895ef07e538bed905
• https://git.kernel.org/stable/c/b003d5b4e46ca5033859db601e12d36da24d0e40
• https://git.kernel.org/stable/c/b09a0503c755b6609fad59a84cc7f05b6843a03c