# CVE-2026-45850: ipvs: skip ipv6 extension headers for csum checks

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

In the Linux kernel, the following vulnerability has been resolved:

ipvs: skip ipv6 extension headers for csum checks

Protocol checksum validation fails for IPv6 if there are extension
headers before the protocol header. iph->len already contains its
offset, so use it to fix the problem.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < 0bf92a90bf05ecafe52e92d5bc15a585021a64ac (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < 54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5 (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < 768f665f3685b455ed686370ed7ccb852a125a3b (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < 9aa7edc1347b98774e5167ca34e5b8aa6083bde7 (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < d643c1ec80b70508f54dac12179e36920e2c00de (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < cdce1e797addab72393c0dfee31aaca41ef7d937 (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4 (affected, git); ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d; < 05cfe9863ef049d98141dc2969eefde72fb07625 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.28 (affected); ≥ 0; < 2.6.28 (unaffected, semver); ≥ 5.10.259; ≤ 5.10.* (unaffected, semver); ≥ 5.15.210; ≤ 5.15.* (unaffected, semver); ≥ 6.1.176; ≤ 6.1.* (unaffected, semver); ≥ 6.6.143; ≤ 6.6.* (unaffected, semver); ≥ 6.12.94; ≤ 6.12.* (unaffected, semver); ≥ 6.18.36; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: ≥ 0; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.68%

- 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/0bf92a90bf05ecafe52e92d5bc15a585021a64ac (CNA: Linux)

- https://git.kernel.org/stable/c/54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5 (CNA: Linux)

- https://git.kernel.org/stable/c/768f665f3685b455ed686370ed7ccb852a125a3b (CNA: Linux)

- https://git.kernel.org/stable/c/9aa7edc1347b98774e5167ca34e5b8aa6083bde7 (CNA: Linux)

- https://git.kernel.org/stable/c/d643c1ec80b70508f54dac12179e36920e2c00de (CNA: Linux)

- https://git.kernel.org/stable/c/cdce1e797addab72393c0dfee31aaca41ef7d937 (CNA: Linux)

- https://git.kernel.org/stable/c/a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4 (CNA: Linux)

- https://git.kernel.org/stable/c/05cfe9863ef049d98141dc2969eefde72fb07625 (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45850; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45850; retrieved 2026-11-06; source updated Not reported

Revision: c3031620866fe66b2a9ab7fa78f8449576912da718172158cf50184470f8d972

Canonical: https://y2.dev/cve/CVE-2026-45850

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.