VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-45847: Linux kernel · net: remove WARN_ON_ONCE when accessing forward path array

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in dcf9b3c90e5560339649d088836529883fb509f3 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in dcf9b3c90e5560339649d088836529883fb509f3, a78d055ba7c31103ad02f8eceb0c452e154d2660, 50422613185d505201167e8bdd2f2700790d5db6 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < dcf9b3c90e5560339649d088836529883fb509f3	Fixed in dcf9b3c90e5560339649d088836529883fb509f3
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < a78d055ba7c31103ad02f8eceb0c452e154d2660	Fixed in a78d055ba7c31103ad02f8eceb0c452e154d2660
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < 50422613185d505201167e8bdd2f2700790d5db6	Fixed in 50422613185d505201167e8bdd2f2700790d5db6
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < 548244c2f542aa0ad49453e9306e715a3877bc44	Fixed in 548244c2f542aa0ad49453e9306e715a3877bc44
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < 9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6	Fixed in 9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6
LinuxLinux	Affected ≥ ddb94eafab8b597b05904c8277194ea2d6357fa9, < 959ea349c7e2d4edf07b6838ca7e59345fe61a08	Fixed in 959ea349c7e2d4edf07b6838ca7e59345fe61a08

Description

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.

References

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