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CVE-2026-90146

bpf, xdp: move offload check into dev_xdp_install() PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before bd06033625ec20b7bdec43d21f776fc1a5e9000e; affected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before 486dbe7efec2be19cd3625be282f7f6b34a3f2c5; affected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before f14b774ec9bd52d0f4ec29a6597a35fd107197f9; affected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before ea7b35dcc9430293b861bc7bad0c546f193c85f9; affected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before 03022dd874070768a7099f18b1944c633641315f; affected 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 before ad27ed7d2309419a129078d781504f486b1b469a
Linux / Linuxaffected 5.9; unaffected 0 before 5.9; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References