# CVE-2026-45917: ipvs: do not keep dest_dst if dev is going down

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < 0b60fb44247eab81e7a9490c38ca62c7120eec75 (affected, git); ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < 11d35b11013442576f35fd9e8a8fc16155101906 (affected, git); ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < 64af43033503458c46023e56d6ae7bb0f824b55f (affected, git); ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < bae53b3baf2ff2f45f9205c438818fc055601a54 (affected, git); ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < 024eb0bd19f507e6e7f0c7a7e5506d66b5dc1d3e (affected, git); ≥ 7a4f0761fce32ff4918a7c23b08db564ad33092d; < 8fde939b0206afc1d5846217a01a16b9bc8c7896 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.39 (affected); ≥ 0; < 2.6.39 (unaffected, semver); ≥ 6.1.191; ≤ 6.1.* (unaffected, semver); ≥ 6.6.160; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 4.73%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/0b60fb44247eab81e7a9490c38ca62c7120eec75 (CNA: Linux)

- https://git.kernel.org/stable/c/11d35b11013442576f35fd9e8a8fc16155101906 (CNA: Linux)

- https://git.kernel.org/stable/c/64af43033503458c46023e56d6ae7bb0f824b55f (CNA: Linux)

- https://git.kernel.org/stable/c/bae53b3baf2ff2f45f9205c438818fc055601a54 (CNA: Linux)

- https://git.kernel.org/stable/c/024eb0bd19f507e6e7f0c7a7e5506d66b5dc1d3e (CNA: Linux)

- https://git.kernel.org/stable/c/8fde939b0206afc1d5846217a01a16b9bc8c7896 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45917; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45917; retrieved 2026-11-06; source updated Not reported

Revision: 1083b24df0ae3e390c59c5ef56dbe9370ab698709f96a88dd2dc412d6c683623

Canonical: https://y2.dev/cve/CVE-2026-45917

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