CVE-2026-90146

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf, xdp: move offload check into dev_xdp_install()

bpf_xdp_link_update() calls dev_xdp_install() directly and skips dev_xdp_attach(), so the checks in dev_xdp_attach() do not run. A user can make an XDP link with a normal program and then swap in an offloaded or device-bound program with BPF_LINK_UPDATE, which puts it on the software path.

dev_xdp_install() is the one place all three paths go through: "ip link set xdp" and BPF_LINK_CREATE reach it via dev_xdp_attach(), and BPF_LINK_UPDATE calls it directly. So move the program checks (offloaded, bound to another device, device-bound in generic mode, native vs generic, DEVMAP and CPUMAP) there, and keep only the netlink-flag check (XDP_FLAGS_UPDATE_IF_NOEXIST) in dev_xdp_attach().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 < ea7b35dcc9430293b861bc7bad0c546f193c85f9affected
LinuxLinux026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 < 03022dd874070768a7099f18b1944c633641315faffected
LinuxLinux026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 < ad27ed7d2309419a129078d781504f486b1b469aaffected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References