CVE-2026-90080

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxefabce29015189cb5cd8066cf29eb1d754de6c3c < b003d5b4e46ca5033859db601e12d36da24d0e40affected
LinuxLinuxefabce29015189cb5cd8066cf29eb1d754de6c3c < 7e33c6bd049b532d2ec4916895ef07e538bed905affected
LinuxLinuxefabce29015189cb5cd8066cf29eb1d754de6c3c < b09a0503c755b6609fad59a84cc7f05b6843a03caffected
LinuxLinux9bd7273cf1f9c5761d696cca821d25602e8f7009affected
LinuxLinux6.14.9 < 6.15affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References