# CVE-2026-45847: net: remove WARN_ON_ONCE when accessing forward path array

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

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

net: remove WARN_ON_ONCE when accessing forward path array

Although unlikely, recent support for IPIP tunnels increases chances of
reaching this WARN_ON_ONCE if userspace manages to build a sufficiently
long forward path.

Remove it.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < 548244c2f542aa0ad49453e9306e715a3877bc44 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < dcf9b3c90e5560339649d088836529883fb509f3 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < 9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < 959ea349c7e2d4edf07b6838ca7e59345fe61a08 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < 50422613185d505201167e8bdd2f2700790d5db6 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < a78d055ba7c31103ad02f8eceb0c452e154d2660 (affected, git); ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9; < 008e7a7c293b30bc43e4368dac6ea3808b75a572 (affected, git). Source: CNA: Linux
- Linux / Linux: 5.13 (affected); ≥ 0; < 5.13 (unaffected, semver); ≥ 5.15.202; ≤ 5.15.* (unaffected, semver); ≥ 6.1.165; ≤ 6.1.* (unaffected, semver); ≥ 6.6.128; ≤ 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 5.27%

- 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/548244c2f542aa0ad49453e9306e715a3877bc44 (CNA: Linux)

- https://git.kernel.org/stable/c/dcf9b3c90e5560339649d088836529883fb509f3 (CNA: Linux)

- https://git.kernel.org/stable/c/9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6 (CNA: Linux)

- https://git.kernel.org/stable/c/959ea349c7e2d4edf07b6838ca7e59345fe61a08 (CNA: Linux)

- https://git.kernel.org/stable/c/50422613185d505201167e8bdd2f2700790d5db6 (CNA: Linux)

- https://git.kernel.org/stable/c/a78d055ba7c31103ad02f8eceb0c452e154d2660 (CNA: Linux)

- https://git.kernel.org/stable/c/008e7a7c293b30bc43e4368dac6ea3808b75a572 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45847; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45847; retrieved 2026-11-06; source updated Not reported

Revision: fc7552ad79e83a44edaee8d8aee2ccdfb626f6f13ead0b0bc3adfb820b900bbc

Canonical: https://y2.dev/cve/CVE-2026-45847

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