CVE-2026-45847

Local service interruption via forward-path assertion

Published May 27, 2026 · Updated May 27, 2026

Reachable assertion in the forwarding-path logic of Linux Kernel allows local users to interrupt service via a long path. The dev_fwd_path() helper increments the path count, then invokes WARN_ON_ONCE when the count reaches NET_DEVICE_PATH_STACK_MAX instead of only returning NULL. Userspace must construct a sufficiently long forward path, with IPIP tunnel support increasing reachability; a host panics only when kernel-warning panic behavior is enabled.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the forwarding-path logic of Linux Kernel allows local users to interrupt service via a long path. The dev_fwd_path() helper increments the path count, then invokes WARN_ON_ONCE when the count reaches NET_DEVICE_PATH_STACK_MAX instead of only returning NULL. Userspace must construct a sufficiently long forward path, with IPIP tunnel support increasing reachability; a host panics only when kernel-warning panic behavior is enabled.

The record

CVE
CVE-2026-45847
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.13
  2. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <008e7a7c293b30bc43e4368dac6ea3808b75a572
  3. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <50422613185d505201167e8bdd2f2700790d5db6
  4. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <548244c2f542aa0ad49453e9306e715a3877bc44
  5. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6
  6. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <959ea349c7e2d4edf07b6838ca7e59345fe61a08
  7. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <a78d055ba7c31103ad02f8eceb0c452e154d2660
  8. Affected versionversion=ddb94eafab8b597b05904c8277194ea2d6357fa9 <dcf9b3c90e5560339649d088836529883fb509f3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <008e7a7c293b30bc43e4368dac6ea3808b75a572; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <50422613185d505201167e8bdd2f2700790d5db6; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <548244c2f542aa0ad49453e9306e715a3877bc44; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <959ea349c7e2d4edf07b6838ca7e59345fe61a08; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <a78d055ba7c31103ad02f8eceb0c452e154d2660; version=ddb94eafab8b597b05904c8277194ea2d6357fa9 <dcf9b3c90e5560339649d088836529883fb509f3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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