CVE-2026-31621

Local kernel crash via bnge cleanup NULL dereference

Published Apr 24, 2026 · Updated Apr 24, 2026

NULL pointer dereference in Linux kernel bnge 6.19 through 6.19.13 and 7.0 allows local users to crash the kernel. When auxiliary_device_add() fails, the error path calls auxiliary_device_uninit() without returning, freeing and clearing bd->auxr_dev before the next statement dereferences it. Reachability requires the bnge driver and an auxiliary-device-add failure; the reported consequence is a local kernel crash without confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel bnge 6.19 through 6.19.13 and 7.0 allows local users to crash the kernel. When auxiliary_device_add() fails, the error path calls auxiliary_device_uninit() without returning, freeing and clearing bd->auxr_dev before the next statement dereferences it. Reachability requires the bnge driver and an auxiliary-device-add failure; the reported consequence is a local kernel crash without confidentiality or integrity impact.

The record

CVE
CVE-2026-31621
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <38c383ec6d37f4b5597f8e6a1f5c2ab31ea01d3a
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87bc3557c708110d83086bf091328271298a44e3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <38c383ec6d37f4b5597f8e6a1f5c2ab31ea01d3a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87bc3557c708110d83086bf091328271298a44e3

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
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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