bpf, xdp: move offload check into dev_xdp_install()
CVE-2026-90146 · published 17 Sept 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-90146?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 to < bd06033625ec20b7bdec43d21f776fc1a5e9000e, 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 to < 486dbe7efec2be19cd3625be282f7f6b34a3f2c5, 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 to < f14b774ec9bd52d0f4ec29a6597a35fd107197f9, 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 to < ea7b35dcc9430293b861bc7bad0c546f193c85f9
- Linux Linux: 5.9
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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().
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/bd06033625ec20b7bdec43d21f776fc1a5e9000e
- git.kernel.org/stable/c/486dbe7efec2be19cd3625be282f7f6b34a3f2c5
- git.kernel.org/stable/c/f14b774ec9bd52d0f4ec29a6597a35fd107197f9
- git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9
- git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f
- git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON